256mm brake upgrade

[the edmundator]

I may well have an almost complete set up coming soon as having driven a car with rear discs I can't really tell the difference as I have those whacking great Wilwoods at the front. May also have the Servo as going to play around with just the uprated master cylinder.

I'll bear it in mind - get in touch if you're selling. However, I might end up buying pretty much everything new due to the intended use of the car.

[dingorocco]

There is also some debate regarding the brake proportioning valves with rear discs. Some people state that cars running rear discs use different prop valves, other report no difference using the standard Scirocco prop valves that were used with drum brakes.

There is indeed a difference in these valves. The disc version has pressure cut of at 15 Bar, ( VW # 533 612 151A ) and the drum version cuts of at 35 Bar (VW # 533 612 151 )as marked on the valves themselves.

The only difference internally is the spring that opposes the brake force ( stripped both versions and measured )
The 16 V factory proportion valves were obsolete however VW Classic parts now has valves available 533 612 151A, pricey at 85 Euro each !!

Possible cheaper fix is to use "Tilton" or other brand race valve in place of factory unit. + there adjustable

HTH.