Quote:
Originally Posted by Grants911
Thank-you everyone. Here's my current thinking, please weigh in with your thoughts.
I will replace the small, early model year, 964-355-025-52, part number master cylinder with a new more common part # 964.355.903.00. That will give me an upgrade from the 20.6mm bore to a 23mm bore. Going the 993 route is a great option but more than I need, especially given the extra steps required to make the parts work in the car.
My final question to all of you;
Will part # 964.355.903.00 simply bolt on to the brake booster in place of the older 964-355-025-52 part that’s in the car without any modifications?
And some have suggested that I have the the bias valve removed at the same time… thoughts on this?
Thank-you for all your help & experience.
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Again you confusing the vacuum boost and the electro hydraulic boost, possibly because of poor advice elsewhere.
Your C4 electro hydraulic boost is basically the same for all 964C4, 964t, 964RS 993C4, 993RS, 993t
there were different sized m/c and different boost ratios but the systems are all mix and match.
in the regular 964 and regular 993 a vacuum boosted system is used, here the 993 and 964 are different and incompatible, you use one or the other w/ no mixing of parts
Yes use the updated 964 part #, that will be fine yes the p/v can be removed w/ ill effect, the factory did that on the Cups, what you have is basically the same as the brakes on a 964RS or 964Cup(assuming that the rear was addresses as well as the fronts)