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C6 - Front Brake Lockup

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Old Dec 2, 2013 | 12:40 PM
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Default C6 - Front Brake Lockup

How is possible to lock the front wheels of a 2012 Grand sport without locking the rear wheels?

When I noticed the "Service Anti-Lock Brakes" warning and the car took a nose drive I knew I was in trouble.

The true meaning of tire flat spots is now fully understood!
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Old Dec 2, 2013 | 09:29 PM
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If the ABS is not working when you get on the brakes hard, most cars will lock the front wheels before locking the rears.

If your car locked the fronts by itself, without you hitting the brakes, then it needs to see the doctor immediately!
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Old Dec 2, 2013 | 09:35 PM
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Originally Posted by Gearhead Jim
If the ABS is not working when you get on the brakes hard, most cars will lock the front wheels before locking the rears.

If your car locked the fronts by itself, without you hitting the brakes, then it needs to see the doctor immediately!
Thank you. I did not hit the brakes and it's at the Corvette doctors office as we chat.
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Old Dec 3, 2013 | 09:15 PM
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Thanks.
Please post the results, so the rest of us can learn.

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Old Dec 4, 2013 | 10:33 AM
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Originally Posted by Gearhead Jim
Thanks.
Please post the results, so the rest of us can learn.

The Chevy doctor said he believes it is an hydraulic issue with the antilock system yet was concerned that both front wheels locked as they should work independentaly.
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Old Dec 4, 2013 | 10:43 AM
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Originally Posted by Charles Gerughty
Thank you. I did not hit the brakes and it's at the Corvette doctors office as we chat.

That is some scary $h1t right there. Definitely post a followup to the solution/cause of the problem.

Elmer
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Old Dec 5, 2013 | 01:32 PM
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Hi Charles,

When you mention Chevy Doctor are you referring to the dealership? If so, let me know. That is where I can help out!

Keep us posted, regardless.

Kelly J.
Chevrolet Customer Care
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Old Dec 5, 2013 | 02:36 PM
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Originally Posted by Chevy Cust Svc
Hi Charles,

When you mention Chevy Doctor are you referring to the dealership? If so, let me know. That is where I can help out!

Keep us posted, regardless.

Kelly J.
Chevrolet Customer Care
Yes - It is currently at Dublin Chevrolet. So far they have not been able to pinpoint the problem. They had to put two new front tires on it today to test drive the car but I doubt they will be able to duplicate the tire lockup. At least I hope they don't while driving it. It was a pretty scary morning when the brakes locked up and I am concerned about driving it for fear it might happen again.

Chuck Gerughty
Director - Nothern California Corvette Association

P.S - A big shot out to the Bondurant School of Driving. When the law of Physics took over their training kept me from hitting several nearby cars.
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Old Dec 6, 2013 | 12:12 PM
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Still no luck with the problem. The Dealer is now dealing directly with Chevrolet.
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Old Dec 6, 2013 | 01:55 PM
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Modern vehicles don't have a brake bias proportioning valve per se, as that would impact the operation of dynamic stability control where brakes are applied to one or two wheels individually; the ABS system controls brake bias electronically.
Thus, is ABS fails, you will probably default to a very high front bias as that would be much safer than allowing the rears to lock up at speed.
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Old Dec 6, 2013 | 02:30 PM
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Damn that would have required an underwear change on my part if that happened to me while driving . Luckily you weren't in a turn, or on wet / slick roads etc. Glad it didn't result in an accident and hope they get it resolved quickly for you.
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Old Jan 2, 2014 | 11:57 PM
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36 days and counting. Nothing new to report except I have made 2 car payments and still have an empty spot in my garage.
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Old Jan 3, 2014 | 11:38 AM
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Originally Posted by Charles Gerughty
36 days and counting. Nothing new to report except I have made 2 car payments and still have an empty spot in my garage.
when my C6 was in the shop that long for a trans replacement then waiting on all 4 new trans lines my service manager Gene Kiefer paid my car payments the two months is was their
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Old Jan 3, 2014 | 12:36 PM
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Originally Posted by dennis50nj
when my C6 was in the shop that long for a trans replacement then waiting on all 4 new trans lines my service manager Gene Kiefer paid my car payments the two months is was their
Thanks - I'll pass that on to my Service Manager
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Old Jan 3, 2014 | 01:21 PM
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Wow. 36 days??? The ABS should throw a code that tells the dealer exactly what has failed. Worst case, that would require a new ABS module which has both the ABS computer and ABS valves. Or a wiring harness if part of the harness had been damaged. In either case, I can't imagine why it should take this long. What has the dealership been telling you?

Jason
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Old Jan 3, 2014 | 01:25 PM
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Well, I suspect it's more likely to be AH than ABS, but either one should give a code. And 36 days is a really long time...
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Old Jan 3, 2014 | 01:41 PM
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Good point Jim. I was lumping them together since they're both controlled by the same computer, co-located with the ABS module.

Jason
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To C6 - Front Brake Lockup

Old Jan 3, 2014 | 01:49 PM
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Originally Posted by Gearhead Jim
Well, I suspect it's more likely to be AH than ABS, but either one should give a code. And 36 days is a really long time...
I would tend to agree as AH can apply braking even if you do not have your foot on the brake pedal. Just for the record I was going uphill and I did not have my foot on the brake. I just hate it when the driver in front of me does that.

Thus far the dealer has been responsive and has tried to resolve the issue but it is difficult for them to pinpoint the problem as they do not feel the car is safe to drive.

Chevrolet Customer Care got involved last Friday. Hopefully this post will bring an end to my wait.
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Old Jan 3, 2014 | 02:14 PM
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Fingers crossed for you Charles. Have they replaced the ABS module and computer?

Thanks,
Jason
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Old Jan 3, 2014 | 02:49 PM
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Originally Posted by JasonS5555
Fingers crossed for you Charles. Have they replaced the ABS module and computer?

Thanks,
Jason
Not to my knowledge. I believe they are waiting for CCC to give them guidance.
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