Intermittent ABS issue on C5
#22
Melting Slicks
By you saying you replaced the rear hubs twice I take it you've checked the SKF's to make sure you didn't get a bad set...can't remember but something about the plugs I thought people had a few issues with at first?
#23
Melting Slicks
#24
Drifting
Hey Oli....
I replaced our hubs (4) with the SKFs and after about two events, started seeing an intermittent ABS/AH/TC error. Mine was traced down to the right rear harness. The harness rides the ebrake line and had rotated around to the back side and the wheel had actually wore a hole in the sensor harness.......just enough to short 'occasionally' depending on chassis load.
Just another possible thing to check in an endless chase.........
ADDED: I just noticed the dates on Oli's last post..........am sure this problem has been erradicated..........yes?
I replaced our hubs (4) with the SKFs and after about two events, started seeing an intermittent ABS/AH/TC error. Mine was traced down to the right rear harness. The harness rides the ebrake line and had rotated around to the back side and the wheel had actually wore a hole in the sensor harness.......just enough to short 'occasionally' depending on chassis load.
Just another possible thing to check in an endless chase.........
ADDED: I just noticed the dates on Oli's last post..........am sure this problem has been erradicated..........yes?
Last edited by CP Thunder; 08-25-2009 at 03:14 PM.
#25
Melting Slicks
Hey Oli....
I replaced our hubs (4) with the SKFs and after about two events, started seeing an intermittent ABS/AH/TC error. Mine was traced down to the right rear harness. The harness rides the ebrake line and had rotated around to the back side and the wheel had actually wore a hole in the sensor harness.......just enough to short 'occasionally' depending on chassis load.
Just another possible thing to check in an endless chase.........
ADDED: I just noticed the dates on Oli's last post..........am sure this problem has been erradicated..........yes?
I replaced our hubs (4) with the SKFs and after about two events, started seeing an intermittent ABS/AH/TC error. Mine was traced down to the right rear harness. The harness rides the ebrake line and had rotated around to the back side and the wheel had actually wore a hole in the sensor harness.......just enough to short 'occasionally' depending on chassis load.
Just another possible thing to check in an endless chase.........
ADDED: I just noticed the dates on Oli's last post..........am sure this problem has been erradicated..........yes?
i believe you're right :o
#26
Melting Slicks
Member Since: Apr 2003
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#28
Burning Brakes
Ding, ding, Ding! I found it!
The brake unit was intermittingly dropping voltage below the required 5 volts, and kicking a variety of brake codes and causing rear wheel lock up once. The brake unit gets its power through a junction terminal through the starter from the battery. The internal junction had totally cracked from the heat causing an intermitent grounding. I replaced the starter, put on a new heat blanket and covered all the wiring with aluminum thermal tape.
Not problem for a year!
D.J. Covert
2008 NASA-AZ TTS Champion
The brake unit was intermittingly dropping voltage below the required 5 volts, and kicking a variety of brake codes and causing rear wheel lock up once. The brake unit gets its power through a junction terminal through the starter from the battery. The internal junction had totally cracked from the heat causing an intermitent grounding. I replaced the starter, put on a new heat blanket and covered all the wiring with aluminum thermal tape.
Not problem for a year!
D.J. Covert
2008 NASA-AZ TTS Champion
#29
Heel & Toe
Tcs/abs
look for wire's grounding, had the same problem, found shorted wire under
front leaf spring, replaced, no more ABS/TCS codes... racing this weekend, no come home on flat bed tow truck!!!!!!
front leaf spring, replaced, no more ABS/TCS codes... racing this weekend, no come home on flat bed tow truck!!!!!!
#30
you seem far too senior a member to not know this, but maybe this is the problem, try grounding the calipers. I had to do this when I installed s.s. braided brake lines. Just a single wire from the calipers to the frame of the car could solve your problem.
#31
Le Mans Master
Thread Starter
Wow! This thread I started well over a year ago.
It turned out to be a worn wire shorting out intermittently.
It turned out to be a worn wire shorting out intermittently.
#32
Vetteless
Member Since: Jul 2004
Location: Gallatin TN
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St. Jude Donor '09
Wow - an old thread lives on! When I started reading this, the first thing that occurred to me was how - especially in track rat cars - the power steering fluid resevoir will dump PS fluid right down onto the ABS module below it. This can wreak havoc with the wiring harness, plug, and the module itself. For those of you who track the car often, zip-tie a shop rag to the lid of your PS resevoir to catch the fluid as it comes out. You might be surprised how quickly it gets saturated - I was!
#33
Le Mans Master
#34
Melting Slicks
Wow - an old thread lives on! When I started reading this, the first thing that occurred to me was how - especially in track rat cars - the power steering fluid resevoir will dump PS fluid right down onto the ABS module below it. This can wreak havoc with the wiring harness, plug, and the module itself. For those of you who track the car often, zip-tie a shop rag to the lid of your PS resevoir to catch the fluid as it comes out. You might be surprised how quickly it gets saturated - I was!
#35
Former Vendor
I just had the other way happen to me last track event. The pump would come on during light braking applications. I'm thinking my tire sizes are too close, because it was the only thing that I changed
Randy
Randy
#36
Instructor
It's weird and coincidental that several of us have had this problem recently and then this old post appears!
Thanks Oli and all the other contributors. I was going nuts trying to track down this problem before I hurt myself or others.
This issue caused me to go off several times into the gravel at Firebird West Track last week-end. If the same thing had happened at Phoenix International, I would have been into the wall HARD.
Now that we have some ideas as to what to look for, maybe We can actually find the fix. Until then, I can't trust the car and that's no fun.
I'll post the cause when we find it.
Cheers,
CV
Thanks Oli and all the other contributors. I was going nuts trying to track down this problem before I hurt myself or others.
This issue caused me to go off several times into the gravel at Firebird West Track last week-end. If the same thing had happened at Phoenix International, I would have been into the wall HARD.
Now that we have some ideas as to what to look for, maybe We can actually find the fix. Until then, I can't trust the car and that's no fun.
I'll post the cause when we find it.
Cheers,
CV
#37
Le Mans Master
Thread Starter
It's weird and coincidental that several of us have had this problem recently and then this old post appears!
Thanks Oli and all the other contributors. I was going nuts trying to track down this problem before I hurt myself or others.
This issue caused me to go off several times into the gravel at Firebird West Track last week-end. If the same thing had happened at Phoenix International, I would have been into the wall HARD.
Now that we have some ideas as to what to look for, maybe We can actually find the fix. Until then, I can't trust the car and that's no fun.
I'll post the cause when we find it.
Cheers,
CV
Thanks Oli and all the other contributors. I was going nuts trying to track down this problem before I hurt myself or others.
This issue caused me to go off several times into the gravel at Firebird West Track last week-end. If the same thing had happened at Phoenix International, I would have been into the wall HARD.
Now that we have some ideas as to what to look for, maybe We can actually find the fix. Until then, I can't trust the car and that's no fun.
I'll post the cause when we find it.
Cheers,
CV
Oli
#38
Terminal Vette Addict
After a day out at the track, I take the car home and I SCRUB off the brake dust.
Calipers & hubs/ control arms.
Wheels, etc.
Often after all that cleaning (and tons of water) i get those codes when i first fire up teh car. After hitting the roads, and braking on the street pads some to get them used to the glazed rotors the heat dries it all out.
I park the car. Turn it off. Clear the codes. And on next start up they gone.
My point to you is, that water i think shorts the hub speed sensors and causes this problem. The heat dries them, and fine.
I would try lookin at the sensor / hubs. You might have a metls wire short.
K
Calipers & hubs/ control arms.
Wheels, etc.
Often after all that cleaning (and tons of water) i get those codes when i first fire up teh car. After hitting the roads, and braking on the street pads some to get them used to the glazed rotors the heat dries it all out.
I park the car. Turn it off. Clear the codes. And on next start up they gone.
My point to you is, that water i think shorts the hub speed sensors and causes this problem. The heat dries them, and fine.
I would try lookin at the sensor / hubs. You might have a metls wire short.
K
#39
Had a similar issue this past weekend except it was the battery sliding around and loosening up the connectors. A cheap fix.
Be careful with this one, having your ABS go at the exact wrong moment can replicate the feeling something breaking in your steering which could lead to an off track excursion. Also, if your running aggressive rear pads with no ABS than the rear tires will tend to lock up(or atleast upset the car) under certain weight transfer conditions.
Be careful with this one, having your ABS go at the exact wrong moment can replicate the feeling something breaking in your steering which could lead to an off track excursion. Also, if your running aggressive rear pads with no ABS than the rear tires will tend to lock up(or atleast upset the car) under certain weight transfer conditions.
http://forums.corvetteforum.com/cana...mpionship.html