Brake issues on my 1999 A6 Sedan, Quattro (98K mi)
09-09-2008, 08:28 AM
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Brake issues on my 1999 A6 Sedan, Quattro (98K mi)
My A6 is in the shop for "brake overheating." The technician has looked into virtually everything and says he cannot fix it. He says that it cannot be driven in this condition. What are the possible causes of this? The technician has checked all the possible reasons: rotars, brake shoe, ABS, etc. but cannot seem to solve the problem. Has anyone encountered a similar problem? If so, how was it dealt with?
Thanks
Thanks
09-09-2008, 08:34 AM
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Re: Front or rear? Seized caliper?
It's the front right wheel. If the tech has been working on it, i'm assuming a seized caliper has been looked into. Wouldn't the wheel not turn if the caliper were seized and wouldn't that be repairable w/new calipers?
Would replacing the front end using parts from a scrapped A6 be ridiculous?
Would replacing the front end using parts from a scrapped A6 be ridiculous?
09-09-2008, 09:16 AM
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Think about how a brake can overheat - only one way I can think of, and that is
through friction. Excessive friction would result from a seized/dragging caliper, or possibly a severely warped rotor. I can't think of anything else. Each of these can be looked into very easily - and remedied easily as well.
FWIW, you can easily have a dragging caliper and yet the wheel will still be able to turn - just not freely.
Also, when you ask about replacing the front end, are you talking more than your brakes?
FWIW, you can easily have a dragging caliper and yet the wheel will still be able to turn - just not freely.
Also, when you ask about replacing the front end, are you talking more than your brakes?
09-09-2008, 09:18 AM
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If caliper seized, simple caliper bolt out replace. Also...
Strange as it may seem, from C3 experience, also check the master cylinder. I had one fail and its symptoms were locking up one of the then two sets of brake fluid circuits. Of course this would be after diagnosing the brake mechanicals at the wheel as well as the ABS functioning--sensor at wheel as well as ABS unit itself. A computer scan would help reveal ABS related issues.
If it is master cylinder hanging up, often rapping on it with a rubber hammer or chunk of wood can free it up temporarily, which then really zooms in on the culprit. It's not that expensive a part to replace (especially compared to the ABS unit). If your car has no history of periodic brake fluid changes, it's a real possibility either the brake caliper or the master cylinder have failed.
If it is master cylinder hanging up, often rapping on it with a rubber hammer or chunk of wood can free it up temporarily, which then really zooms in on the culprit. It's not that expensive a part to replace (especially compared to the ABS unit). If your car has no history of periodic brake fluid changes, it's a real possibility either the brake caliper or the master cylinder have failed.
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