Dragaholic

iTrader: (180)

I received my lugnuts and put my Bogarts on and took it out for a run last night and out of nowhere while I was on the highway, the Brake and ABS INOP light came on. I didnt know what was going on, but I was worried. I applied the brakes to make sure they were still working, thankfully they were. I dont know if it had anything to do with the wheels and tires. I have 26x11.5x15s ET Streets in the rear mounted on 15x10s and 165r15s in the front mounted on 15x4s. I figure it may be the rims and tires because Ive never experienced this problem before until I put them on. Whats the reason behind this? Thanks

Oh one more thing...I was testing the tires out a bit and gave them a couple of turns to get 'em a little sticky and I did a practice launch, nothing real serious, and my low trac light came on. Is that normal?

NiceTry

iTrader: (1)

this is normal, it happens alot when you are running skinnies and slicks because of the differences in tire sizes

2001CamaroGuy

iTrader: (6)

Check to see if you have a loose ground. I had this exact thing happen (ABS INOP, Brake light, and even the gauges would flip on and off.....) and it was the little ground wire on the drives side.

Dragaholic

iTrader: (180)

When I got back in the car to head back home last night, the lights did not come on and for the whole way home. Hopefully it doesnt come on again. Im almost positive that its the rims and tires because like I said before, I never had this problem until I put them on. Thank for the help.

2001CamaroGuy: I dont think its a ground because I never experienced the flickering as you did, but thanks for the suggestion.

Lastly, what are the purposes of those lights or what are they warning you about? Just wanted to know in case it they ever come on again and I have the stock wheels and tires on.

Mod Maniac

I believe that each wheel has its own sensor that senses the speed of each individual wheel. There is a small "gear" that spins with the wheel that passes over a small magnet. As this "gear" spins over the magnet, an electrical current is created thus sending a signal to the computer. When the computer detects contradiciting speeds between the wheels, it thinks there is a malfunction and subsequently shuts down the ABS and TCS/ESR. Thus triggering the light on your dash. Someone correct me if I am wrong. But I think this is how it operates.

Dragaholic

iTrader: (180)

Everything sounds like it could be right to me, but the only part that I would have to disagree on is the shutting down part of the ABS. When those lights did come on, I made sure that the brakes did work before I panicked. LOL Sure enough they did and I just hoped they would get me to my destination in one piece.

lopo

when the abs light comes on it could be many things. each wheel has a sensor, called a speed sensor. is any of these are corroded or unplugged your abs light will come on. if there is a bad fuse your abs light will come on. whenever the abs light comes on it means the computer deactivated the abs but you still have normal braking.

Mod Maniac

Many times metal shavings build up on the magnet and subsequently throws the light.

demonspeed

iTrader: (7)

What they said...

Also, it usually always happens on the dyno as well.

Mod Maniac

Yep, classic example. Front wheels stopped and rears spinning. Speed sensors in each of the 4 corners pick up a difference in speed, subsequently triggering the ABS INOP light. After the dyno pull and when the car is driven normally for about 5-10 minutes, the light should go out.

Hope this helps.

Dragaholic

iTrader: (180)

Where are these sensors, magnets, etc. located?

Mod Maniac

Apparently the front wheel sensors are located somewhere behind the wheel above the lower control arm. Probably behind the rotors. The rears are located behind the wheels probably behind the rotors. I guess these individual speed sensors communicate with the vehicle speed sensors. I know one is located on the aft end of the transmission on the left side(manual tranny).

NBM2001z28

iTrader: (43)

i was doing donuts last night in the snow and it came on. so i shut the car off and started it up again to see what happened. the abs light and the brake went off but then the mileage etc didnt show. so i shut it off and restarted again and it was fine. dont know what happened but whatever.