ABS won't engage
#1
ABS won't engage
It seems like ever since I installed this aftermarket torque arm, I just cannot get my ABS to activate. On dry pavement in a straight line, I can put the pedal to the floorboard and it'll stop hard - but the pedal doesn't pulse nor does the ABS light come on.
In a damp straight stop from about 30-40MPH, it'll stop pretty hard, but the last few feet the LOW TRAC light lit on my dash - and I would have through the ABS light should be lit instead.
Is it possible something is not corrected properly, or might the design of the torque arm be responsible for the inactivity of the ABS? The TA I've got emulates extending the length of the TA all the way to the front tires under braking, but under acceleration the arm is shorter than stock and doesn't connect to the tranny.
I'd just feel better if I could get it to activate
In a damp straight stop from about 30-40MPH, it'll stop pretty hard, but the last few feet the LOW TRAC light lit on my dash - and I would have through the ABS light should be lit instead.
Is it possible something is not corrected properly, or might the design of the torque arm be responsible for the inactivity of the ABS? The TA I've got emulates extending the length of the TA all the way to the front tires under braking, but under acceleration the arm is shorter than stock and doesn't connect to the tranny.
I'd just feel better if I could get it to activate
#4
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Originally Posted by JimMueller
Hmm, even if the bulb was burned out, the ABS should still function and the pedal should still pulse. So why would I get the Low Trac indicator without any ABS activation during hard braking?
#5
The ABS will only activate if one or more of your wheels is slipping. If you've got good brakes and can stop just fine on dry pavement by mashing the pedal, it's not going to activate. When it does activate, the "low traction" light will come on, not the ABS light. The latter illuminates when the system is disabled due to a problem detected by the EBCM/EBTCM.
If you want to see if it works, wait until the pavement is wet, then nail the pedal from a 50 roll or so
If you want to see if it works, wait until the pavement is wet, then nail the pedal from a 50 roll or so
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#8
Originally Posted by stang killer
off tiopic, but how was the instal on that UE TQarm. Was it worth the cost?
I've never used any other aftermarket torque arm, so I can't compare to anything other than stock. I installed it in December, and only got the brake link set right about a month ago. Ever since then, I haven't been able to cause any brake hop - and short of my concerns about ABS kicking in, I've not had any braking problems which can't be attributed too much negative camber. I haven't noticed any gain in traction from a stop.
SFA the ABS, it sounds like moving the instant center from behind the tranny to the front contact patch when the TA decouples might be giving me better brake traction, and also not allowing the rear axle to hop.
#9
TECH Apprentice
Originally Posted by DravenMyers
The low traction light is coming because the system is detecing low traction I dont think the abs will come on at the same time when braking hard but you should scan your computer for any abs codes or problems.I dought your bulb is out but to check it just turn your key and see if it lights up or maybe your abs pump is not working their for not makeing your brakes shuter when braking hard but I am sure that if you had any abs problems it would set your abs inop light on
#10
Banned
iTrader: (5)
If the pump motor dies, the ABS regulation is ended immediatly. This still leaves you with EBD, so it behave like a car with no abs and a mechanical proportioning valve. Your pedal will not go to the floor as TooSlow02 states.
Brakes are a safety system and has strict regulations by the federal government so situations where your pedal goes to the floor don't occur.
By the way, there are errors that will not set an ABS Inop light. The brake lamp switch is one.
Brakes are a safety system and has strict regulations by the federal government so situations where your pedal goes to the floor don't occur.
By the way, there are errors that will not set an ABS Inop light. The brake lamp switch is one.
#11
TECH Apprentice
Originally Posted by Gregg_98TA
If the pump motor dies, the ABS regulation is ended immediatly. This still leaves you with EBD, so it behave like a car with no abs and a mechanical proportioning valve. Your pedal will not go to the floor as TooSlow02 states.
Brakes are a safety system and has strict regulations by the federal government so situations where your pedal goes to the floor don't occur.
By the way, there are errors that will not set an ABS Inop light. The brake lamp switch is one.
Brakes are a safety system and has strict regulations by the federal government so situations where your pedal goes to the floor don't occur.
By the way, there are errors that will not set an ABS Inop light. The brake lamp switch is one.
BTW, in a perfect world, situations where your brake pedal goes to the floor would not occur. And they shouldn't. But I've met a few (thankfully, very few, but a few more than I should have) clients of a luxury car manufacturer who may disagree with you on that one.
#12
Banned
iTrader: (5)
Hypothetically, it would depend on the motor failure. The failure I am sure you are refering is a state of OFF. In which case, the pedal would go to the floor. As to how quickly depends on many variables.
Let's not bring in other vehicles. Every manufacturer implements the features to meet saeftey regulations differently. Each uses different combinations of software and hardware which results in different degrees of severity, occurance, and detection.
Let's not bring in other vehicles. Every manufacturer implements the features to meet saeftey regulations differently. Each uses different combinations of software and hardware which results in different degrees of severity, occurance, and detection.
#13
TECH Senior Member
iTrader: (4)
I hadn't really thought about it, but if I "kill" the motor (pull a wire off? Can I get to it to do that?), the EBD will still work and I will be ABS free without the EBD problems? I'll leave the block in the car (I'm not in this for weight savings), but I'd love the ABS function to be gone and just keep the EBD working.
Interesting.
Interesting.
#14
TECH Apprentice
Originally Posted by Gregg_98TA
Hypothetically, it would depend on the motor failure. The failure I am sure you are refering is a state of OFF. In which case, the pedal would go to the floor. As to how quickly depends on many variables.
Let's not bring in other vehicles. Every manufacturer implements the features to meet saeftey regulations differently. Each uses different combinations of software and hardware which results in different degrees of severity, occurance, and detection.
Let's not bring in other vehicles. Every manufacturer implements the features to meet saeftey regulations differently. Each uses different combinations of software and hardware which results in different degrees of severity, occurance, and detection.
And while it's true that different manufacturers do things in different ways, brake hardware and features are the one thing that is markedly similar in very different cars. And they all have to meet the same criteria for safety. So comparing vehicles from different manufacturers isn't really out of the ordinary. The same scenario holds true whether you are talking about a six-figure sports car or a lowly econo-box (provided you opted for the optional but available ABS in the latter).
#15
Banned
iTrader: (5)
First, the pump motor on the F-bodies is switched by the ABS ECU. So, internally to the unit, but not the pump motor itself. And there are failure conditions that could keep the motor running.
Different designs have different criteria they must meet. The end goal is to meet the same overall goal, but each company uses different solutions. An easy example is a uni-body versus a body on frame. The same is true with different ABS units. The goal of ABS is the same, but the designs are quite different. One company might detect a failure with hardware and the other software. Due to design, one might have a failure condition that the other does not.
Its obvious your not an engineer if you believe that brake hardware and features are markedly similar. Powertrain controls are less complex than brake controls because powertrain is not a safety system. If your engine dies, you pull over to the side of the road. If your brakes go out, someone could die because they hit a wall at 50mph.
You need to trust me on this, an ABS unit in an econo-box is not as safe as a luxury car from the view you take. There are more safety features for keeping the car under the drivers control than in an econo-box.
Your thinking is great for most people. I work on ABS for a living and can't afford to think like you. Some times I know too much about it.
Different designs have different criteria they must meet. The end goal is to meet the same overall goal, but each company uses different solutions. An easy example is a uni-body versus a body on frame. The same is true with different ABS units. The goal of ABS is the same, but the designs are quite different. One company might detect a failure with hardware and the other software. Due to design, one might have a failure condition that the other does not.
Its obvious your not an engineer if you believe that brake hardware and features are markedly similar. Powertrain controls are less complex than brake controls because powertrain is not a safety system. If your engine dies, you pull over to the side of the road. If your brakes go out, someone could die because they hit a wall at 50mph.
You need to trust me on this, an ABS unit in an econo-box is not as safe as a luxury car from the view you take. There are more safety features for keeping the car under the drivers control than in an econo-box.
Your thinking is great for most people. I work on ABS for a living and can't afford to think like you. Some times I know too much about it.
#16
TECH Apprentice
Originally Posted by Gregg_98TA
First, the pump motor on the F-bodies is switched by the ABS ECU. So, internally to the unit, but not the pump motor itself. And there are failure conditions that could keep the motor running.
Originally Posted by Gregg_98TA
Different designs have different criteria they must meet. The end goal is to meet the same overall goal, but each company uses different solutions. An easy example is a uni-body versus a body on frame. The same is true with different ABS units. The goal of ABS is the same, but the designs are quite different. One company might detect a failure with hardware and the other software. Due to design, one might have a failure condition that the other does not.
Originally Posted by Gregg_98TA
You need to trust me on this, an ABS unit in an econo-box is not as safe as a luxury car from the view you take. There are more safety features for keeping the car under the drivers control than in an econo-box.
#17
Banned
iTrader: (5)
First, there ARE pump motor fail conditions where it can fail ON. Sure, not as likely to happen as the OFF condition, but it does exist.
Second, my point is that a pump failure in one car does not guarantee you the same results in another car. Hence, where the design of the system comes in. Depending on the design, sure the failure was detected, but that doesn't meen anything can be done about it.
Third, the throttle relaxer for traction is a systems for limiting torque to the wheels. The end goal is the same as any other traction system. It is just a different traction system. If you believe an accident was caused by it, then you have to believe any traction system would do the same since they are all limiting power.
The panic stop feature is to help prevent accidents. In many studies it has been shown that most people in an emergent stop do not apply full brake pressure immediately. The algorithm uses inputs of pedal distance travled and speed traveld to detect such a situation and help avoid an accident.
You can blame the vehicle and its systems all you want, but in the end it is the driver. If you drive recklessly, no system is going to save you. Take your throttle-relaxer for example. If a driver puts himself in a bad situation, the throttle-relaxer kicks it and an accident occurs. Why did the throttle-relaxer pull power? Loss of traction, right? If traction didn't kick in to help regain traction, how would the out come been different? What's better, less power and traction or full power and no traction? What you need to keep in mind is that the driver put themselvesin the situation by making a bad desicion.
Basically, learn as much as you can about the car you drive. Know what to expect from the car and how it will behave. Its great you can buy a car with all the safety features in the world. But if you don't know how use them, you can make things worse than by not having them. Like pumping the brakes defeat ABS, remember that and the news reports about all problems people had? People needed to be educated to stand on the brakes and let the ABS do the work regardless of the pulsation they felt in the pedal. Maybe the manufactuer or dealer should educate the buyer instead of just trying to make a buck.
"How about the stability control module that decided to open all the outlet valves at once and keep them open for no reason? I guess the module had some homicidal safety features programmed into it." Not even going to go there as it is basically going back to design and safety regulations. Get used to stability control though as the trend is for it to be on all trucks and SUV's. All future truck and SUV products for GM and Honda will have stability control.
Cheap parts? Not sure where to begin on that one. Everyone trying to make a profit and consumer's wanting more while still paying less. OEM's still enforcing better and better quality and reliability. Compare a car now to one 10 years ago. Figure in inflation and which one is more reliable for the money?
I understand how you feel about engineers. I deal with them myself, and hate to admit I am one at times, and most are very detached from the "real" world. But keep in mind the limitations they must work in(money, time, resources, customer requirements...). As it is said, if you don't put limitations and restrictions, the product would be perfect, but no one would be able to afford it. I find it amazing some OEMs can even build a car at all. I should say who, but I mentioned it earlier and it isn't our favorite OEM.
It appears we are the only ones interested in this. If you care to continue this or similar discussions, shoot me a PM and I will give you my email address. I have enjoyed this, but need to watch the content I post due to my knowledge of Bosch braking units.
Second, my point is that a pump failure in one car does not guarantee you the same results in another car. Hence, where the design of the system comes in. Depending on the design, sure the failure was detected, but that doesn't meen anything can be done about it.
Third, the throttle relaxer for traction is a systems for limiting torque to the wheels. The end goal is the same as any other traction system. It is just a different traction system. If you believe an accident was caused by it, then you have to believe any traction system would do the same since they are all limiting power.
The panic stop feature is to help prevent accidents. In many studies it has been shown that most people in an emergent stop do not apply full brake pressure immediately. The algorithm uses inputs of pedal distance travled and speed traveld to detect such a situation and help avoid an accident.
You can blame the vehicle and its systems all you want, but in the end it is the driver. If you drive recklessly, no system is going to save you. Take your throttle-relaxer for example. If a driver puts himself in a bad situation, the throttle-relaxer kicks it and an accident occurs. Why did the throttle-relaxer pull power? Loss of traction, right? If traction didn't kick in to help regain traction, how would the out come been different? What's better, less power and traction or full power and no traction? What you need to keep in mind is that the driver put themselvesin the situation by making a bad desicion.
Basically, learn as much as you can about the car you drive. Know what to expect from the car and how it will behave. Its great you can buy a car with all the safety features in the world. But if you don't know how use them, you can make things worse than by not having them. Like pumping the brakes defeat ABS, remember that and the news reports about all problems people had? People needed to be educated to stand on the brakes and let the ABS do the work regardless of the pulsation they felt in the pedal. Maybe the manufactuer or dealer should educate the buyer instead of just trying to make a buck.
"How about the stability control module that decided to open all the outlet valves at once and keep them open for no reason? I guess the module had some homicidal safety features programmed into it." Not even going to go there as it is basically going back to design and safety regulations. Get used to stability control though as the trend is for it to be on all trucks and SUV's. All future truck and SUV products for GM and Honda will have stability control.
Cheap parts? Not sure where to begin on that one. Everyone trying to make a profit and consumer's wanting more while still paying less. OEM's still enforcing better and better quality and reliability. Compare a car now to one 10 years ago. Figure in inflation and which one is more reliable for the money?
I understand how you feel about engineers. I deal with them myself, and hate to admit I am one at times, and most are very detached from the "real" world. But keep in mind the limitations they must work in(money, time, resources, customer requirements...). As it is said, if you don't put limitations and restrictions, the product would be perfect, but no one would be able to afford it. I find it amazing some OEMs can even build a car at all. I should say who, but I mentioned it earlier and it isn't our favorite OEM.
It appears we are the only ones interested in this. If you care to continue this or similar discussions, shoot me a PM and I will give you my email address. I have enjoyed this, but need to watch the content I post due to my knowledge of Bosch braking units.
#18
TECH Apprentice
Originally Posted by Gregg_98TA
First, there ARE pump motor fail conditions where it can fail ON. Sure, not as likely to happen as the OFF condition, but it does exist.
Second, my point is that a pump failure in one car does not guarantee you the same results in another car. Hence, where the design of the system comes in. Depending on the design, sure the failure was detected, but that doesn't meen anything can be done about it.
Second, my point is that a pump failure in one car does not guarantee you the same results in another car. Hence, where the design of the system comes in. Depending on the design, sure the failure was detected, but that doesn't meen anything can be done about it.
Originally Posted by Gregg_98TA
Third, the throttle relaxer for traction is a systems for limiting torque to the wheels. The end goal is the same as any other traction system. It is just a different traction system. If you believe an accident was caused by it, then you have to believe any traction system would do the same since they are all limiting power.
Originally Posted by Gregg_98TA
The panic stop feature is to help prevent accidents. In many studies it has been shown that most people in an emergent stop do not apply full brake pressure immediately. The algorithm uses inputs of pedal distance travled and speed traveld to detect such a situation and help avoid an accident.
Originally Posted by Gregg_98TA
You can blame the vehicle and its systems all you want, but in the end it is the driver. If you drive recklessly, no system is going to save you. Take your throttle-relaxer for example. If a driver puts himself in a bad situation, the throttle-relaxer kicks it and an accident occurs. Why did the throttle-relaxer pull power? Loss of traction, right? If traction didn't kick in to help regain traction, how would the out come been different? What's better, less power and traction or full power and no traction? What you need to keep in mind is that the driver put themselvesin the situation by making a bad desicion.
again, it didn't relax the throttle. It opened the throttle and sped the car up and made the idiot driver(s) panic and steer into the nearest immovable object. If it was the driver's fault, why did it happen on so many of the same model vehicle under so many different conditions? See, you are assuming that these systems are behaving normally. I trying to explain to you that they are not. The drivers who got rear ended applied the brakes quickly and lightly-but the system intervened. And again, why did it happen on so many vehicles? Why did our engineers freak out when they heard about it? Why did it need to be "fixed" if it was the driver's fault? Why did we have to install an update patch to raise the the intervention thresholds on so many cars? The driver is at fault 99.99% of the time. But these particular instances are the 0.01%.
They are the result of a car company in a hurry.
Originally Posted by Gregg_98TA
Basically, learn as much as you can about the car you drive. Know what to expect from the car and how it will behave. Its great you can buy a car with all the safety features in the world. But if you don't know how use them, you can make things worse than by not having them. Like pumping the brakes defeat ABS, remember that and the news reports about all problems people had? People needed to be educated to stand on the brakes and let the ABS do the work regardless of the pulsation they felt in the pedal. Maybe the manufactuer or dealer should educate the buyer instead of just trying to make a buck.
Originally Posted by Gregg_98TA
"How about the stability control module that decided to open all the outlet valves at once and keep them open for no reason? I guess the module had some homicidal safety features programmed into it." Not even going to go there as it is basically going back to design and safety regulations. Get used to stability control though as the trend is for it to be on all trucks and SUV's. All future truck and SUV products for GM and Honda will have stability control.