Abs inop?
Abs inop? So this has happened a couple of times and it has really gotten annoying/dangerous. During my 3rd or 4th autocross run I'll get the ABS INOP indicator on the dash and my brake pedal would go soft like there's air in the system. I've almost crashed a couple times because I would accidentally lock up the front tires. What is causing this? I read it could be the wheel sensors but this goes away if I turn the car off for over 10-15 min. Light only comes on during hard braking.
Staging Lane
Joined: Jul 2014
Posts: 97
Likes: 0
From: Saline, MI
Are you getting wheel hop under braking or accelerating? Are the rear wheels ever jumping off the ground at any time during your run? How old are the front hubs your using? What hubs are you using? Alot of things i've experienced can do this
I really don't want to delete abs if I don't have to...
If hubs are old and you have a lot of knock back, sure it can be a soft pedal, or you need to pump it up quick. I've had ABS inoperable light come on with heavy driving, not so much at AX but on a road course when everything was hot and overstressed. Maybe at AX a few times, I don't even remember. I'd say get the new hubs on asap and put the Strano brace on and see if it's improved.
Staging Lane
Joined: Jul 2014
Posts: 97
Likes: 0
From: Saline, MI
The ABS inop is from your crappy moog hubs I can't believe you were able to run those. I broke one and lost a wheel on one autocross event with a co driver on hoosiers, next one ran was street tires, still one failed that day.
Wheel hop will also trigger trac loc sometimes or abs inop also
Wheel hop will also trigger trac loc sometimes or abs inop also
TECH Addict
Joined: Feb 2012
Posts: 2,103
Likes: 21
I have had the same issue last season. I started racing the car in 2015 but only had it happen recently. Like the OP, you could pump the brakes a couple of times and all was well. I never noticed the light until the end of a run in grid.
Also switching to SKF hubs tonight so hopefully no more lights come on this season.
Also switching to SKF hubs tonight so hopefully no more lights come on this season.
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Hopefully some good hubs and a full bleed will fix it. I will also try and make some adjustments to minimize brake hop. Next event is on the 19th so we'll see if it's fixed.
One more thing, could it be my battery? I'm running a lightweight Shorai LFX36A3-BS12 Lithium Ion battery. I do notice that every time I start the car all the gauges get pegged and the trip meter resets. Voltage reads normal though.
One more thing, could it be my battery? I'm running a lightweight Shorai LFX36A3-BS12 Lithium Ion battery. I do notice that every time I start the car all the gauges get pegged and the trip meter resets. Voltage reads normal though.
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Hm, that battery could be doing things too. It shouldn't peg the guages on startup, it could be an electrical gremlin. I haven't heard much about LiOn batts in cars, maybe it's spiking or going low for a second and the ECU thinks there's a problem? Maybe go back to stock battery for an event or 2 to rule it out?
Hm, that battery could be doing things too. It shouldn't peg the guages on startup, it could be an electrical gremlin. I haven't heard much about LiOn batts in cars, maybe it's spiking or going low for a second and the ECU thinks there's a problem? Maybe go back to stock battery for an event or 2 to rule it out?
Ohhhh...
I got mine sitting on a table waiting for a free evening to install them. Can't imagine how nice it would feel to not sit at the starting line of every event and hope that you finish with all four wheels
TECH Addict
Joined: Feb 2012
Posts: 2,103
Likes: 21
Maybe so, but still wasn't "hoping" the stock hubs would withstand even used A6's.
I'm more OK with losing a wheel on autocross course...it's riding with my wife on a weekend morning going to breakfast that I fear if a wheel departs the car.
I'm more OK with losing a wheel on autocross course...it's riding with my wife on a weekend morning going to breakfast that I fear if a wheel departs the car.
TECH Addict
Joined: Feb 2012
Posts: 2,103
Likes: 21
You do back to back runs on the same day same course?
One thing that bugs me about autocross is the always changing curses. Would be nice to have more time on one course to make adjustments...I guess that's what RR is for.
One thing that bugs me about autocross is the always changing curses. Would be nice to have more time on one course to make adjustments...I guess that's what RR is for.