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Originally Posted by Pillow
>stock 19/19mm m/c I had before.
Could be because that VW MC is designed for drum brakes instead of the discs.
When I converted the '66 Westi to discs all around Russell at Old Speed said they normally had to rebuild a drum MC to run the discs because there is some "feature" in there that pulls the fluid back to the MC instead of keeping a semi constant pressure residual like a disc MC will. Pardon my lack of technical experience here, just paraphrasing someone elses story  |
You remembered it the wrong way round!
A drum mc has a residual pressure valve in, of around 10psi, this prevents the springs on the shoes retracting the wheel cylinders all the way in.
On a disc car, if the MC is lower than the calipers, a 2psi residual pressure valve is sold to prevent the brake fluid draining back to the MC and retracting the pads from the discs.
Both of these will cause the first press of the brakes to have excessive travel, if you were to pump the brakes the pedal would rise back up though
Paul