I have a problem with the front brakes on my 5ktq.

[Ottar T]

| To: "Audi Quattro List" <quattro at audifans.com>
| Subject: I have a problem with the front brakes on my 5ktq.
| Date: Sun, 5 Nov 2000 12:51:12 +0100

| When the engine compartment temperature is high the brakes will not releast
| properly, when this happens the brakes will of corse be very hot and the
| pads and discs expand even further. Yesterday I had to stumble in to a gas
| station at full throttle and full boost to keep the speed abouve 30! After
| letting the underhood temp cool down for half an hour the brakes worked as
| usuall. I have tried to leave the bonnet closed at these times, then it
| takes a very long time before the brakes work again, I guess that the ABS
| unit is causing the problems... Any other ideas?
|
| Since I have had to disable the ABS earlier because of its less then optimal
| performance on bumpy roads I can just as well do away with the entire ABS
| system. Has anyone done this while keeping the same master cylinder? Where
| is the brake assist connected?
| 
| Thanks in advance,
| 
| Jörgen Karlsson
| Gothenburg, Sweden

This can be a choked drilling between brake fluid reservoir and master brake cylinder. The increased pressure from warming up brake fluid is trapped in master cylinder and not let into the reservoir. The ABS just maintain the pressure applied by the master cylinder, and release pressure on a wheel locking-up, the pump in the ABS unit re-apply the master pressure again. Therfor the pumping in brake pedal when ABS is working, ie. release and re-apply pressure.
Clean up the master cylinder and change brake fluid, use original fluid, and change every 2 year. I think you should stick to ABS.

--
Ottar T
'86 Audi 80 1,8
'97 Audi A6 2,6