<VV> Brake Master Cylinder...

[Frank DuVal]

If a brake pedal seems nice and hard when applying a lot of pressure, 
but then slips slowly to the floor when light pressure is applied, the 
master cylinder needs rebuilding. The seal is bypassing internally, so 
no fluid leaks out, but it leaks back into the reservoir. As Matt says, 
disassembling and cleaning all the parts may solve the problem, but if 
the seal has wear, then replace...

Frank DuVal

Secular wrote:

>  Hi:
>
>  What are the signs of a bad master cylinder? I was helping a friend who has a 65 Convertible. The brake master cylinder was completely empty. The car has been sitting in his garage for a couple of years. We filled it up while pumping the brake pedal. 
>
>  The pedal came up - but after 5 seconds it moves all the way down. There are no signs of leakage from wheel cylinders and the master cylinder is retaining all the brake fluid !
>
>  Please help !
>
>
>  Tony
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