Soft Brake Pedal!!

[cracker5947]

if you want more pressure, get smaller diameter m/c. Nitro is right, bigger surface area means less pressure. look up pascal's law : )

[Massive Lee]

Bigger master cylinder should have more feel to it and less travel... so there is a problem... it sounds like the booster is working fine, but a problem with air in the system

"More feel" and "feeling more to your taste" are two different things. Having more feel from a brake system is usually caused by stiffer calipers with no play and properly bled lines.

Because the MC shoots more fluids, and requires less travel at the expense of more force, is not necessarely equal to more feel. The flex in the caliper is still there.

[einstein57]

"The pedal doesn't drop to the floor so I don't think it'd be a bad MC."

-->The pedal does not need to go to the floor for the master to be bad.While you are sitting at a traffic light pump the pedal a few times and see if the pedal gets firmer as pump.

Mine does this. What does that mean?

[92 mtechnic cabrio]

Mine does this. What does that mean?

that means the master is going bad

[twothrees]

I just replaced my mc this weekend for these exact same reasons. Works great now. I can't believe how disgusting the resevoir was;filled with black, nasty crap. I don't think anyone had ever changed the brake fluid. One of my bleeder valves had rusted shut too.

[einstein57]

that means the master is going bad

Booooo :(. So should i do the 735i mc?

[e30polak]

Just did SS lines in my swap car and made a world of difference in pressure and consistency. With the 320 booster I also use a vacuum reserve canister, which helps with pedal effort. You may want to look into that.

[evil_twin]

Hey, show me your set up with this vacuum reserve canister :)