Master Cylinder Question

[Vince@Meanstreets]

Originally Posted by NAPA 68

After bench bleeding a 1 1/8" bore C3 master cylinder (shallow piston), I noticed the rears come in a fair amount after the front. I currently have the same master on my car (59 Bel Air) and I am getting very little volume and pressure to the rears. I have an adjustable Wilwood proportioning valve on the system and have it opened up all of the way (the car is 4 wheel disc).

While this may sound like an elementary question, is there a M/C that is evenly proportioned through the piston stroke so the valve can do it's job?

In advance, thanks for the consideration.

Tim

When you say "I noticed the rears come in a fair amount after the front" is this while bench bleeding or on the car.
Off car...its by design. One port will have more volume.
On car... You may need to bleed again or you have a possible push rod issue.

[NAPA 68]

Originally Posted by Vince@MSperfab

When you say "I noticed the rears come in a fair amount after the front" is this while bench bleeding or on the car.
Off car...its by design. One port will have more volume.
On car... You may need to bleed again or you have a possible push rod issue.

Vince,

The notable difference is while the M/C is one the car (to the rear calipers). After watching and talking to Kwizz, I was suspecting perhaps I had an issue with the M/C as well. Hence, I tried an other M/C. While bench bleeding, that is where I noticed the rear port came in notably later than the fronts. While the pedal while on the car is good, there is hardly any rear brake in the car (on jack stands). Just trying to think this one through before firing anymore parts at it.

Thanks,

Tim