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RE: Hard brake pedal
>sometimes the pedal
>is hard as a rock, and of course the warning light flashes.
>the pedal will be hard for a few minutes and then it will sink
>bit and the brakes will work normally, except that when I push
>the warning light comes on. I suspect that the problem is with
>the hydraulic servo or the pressure accumulator.
>I disconnected the return line from the servo, as per the
>Haynes manual, and the fluid did not leak out of the hole,
>according to Haynes means the servo is OK.
Haynes says to perform this test with engine off and this assumes the
bomb (pressure accumulator) is working. Therefore I believe this test is
better made with the engine running. If the servo checks out OK with the
engine running and the pump has been renewed, there's no other
possibility but a dead bomb. On 12 years old Audi this is no surprise.
87 Audi 5000CS turbo (mine)
88 Renault Medallion wagon (mom's)
91 mountain bike (just in case both cars broke at the same time :-)