A6 / S6 (C5 Platform) Discussion Discussion forum for the C5 Audi A6 and S6 produced from 1998-2004

Brakes are engaged and won't let go!!

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Old Apr 1, 2009 | 08:51 AM
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Default Brakes are engaged and won't let go!!

I removed the ABS lines when installing the rack and pinion (now I know I didn't have to). When I finished the installation I started noticing that after I drove it for about 10 miles the brakes would engage progressively without me pressing on the pedal. My gas comsumption went down to 16 mpg from 22 mpg. And when I touch the rotor was super hot.

Today, after driving it 10 miles, it got to the point it wouldn't move at all. I let it stand for about 15 minutes and the brakes would then release. I was able to drive to work. The thing is, it sometimes does it and sometimes won't. Anyone experienced this before?
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Old Apr 1, 2009 | 08:52 AM
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I guess I need to say it is a 2000 4.2 quattro, 116K miles.
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Old Apr 1, 2009 | 09:20 AM
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Have you checked for codes with VAG-COM?
How did you bleed the system when you got it back together?
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Old Apr 1, 2009 | 09:34 AM
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No. I don't have the VAGCOM.

To bleed it I would step on the brake pedal 3 times then hold the pedal down. Someone else at the caliper would open the valve to release the fluid. We did RR then RL - FR - FL. We did not flush or bleed at the ABS module though.
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Old Apr 1, 2009 | 09:37 AM
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I'd probably start using VAG-COM to scan for codes and to bleed.

Or at least do some sort of pressure bleed. Pump and dump is not good for the master cylinder. It may be damaged.
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Old Apr 1, 2009 | 10:38 AM
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OK. I'll get a power bleeder and try it. I'll let you know.

Thank you.
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Old Apr 1, 2009 | 10:41 AM
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you'll probably have to bleed the ABS pump, and certainly the whole system.. And you do need a VAG COM to cycle the pump to bleed IIRC..
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