whats wrong with my brakes?

[GregWeld]

Good info.....


You really don't have enough vacuum for good power brakes.... Your idle vacuum is about HALF what you really need... and even at your 2000 rpm level you're only making 17"....

Pedal ratio is "okay" for power brakes -- but not when you have such low vacuum.

Also -- check that your booster is okay. With the car running -- apply the brakes --- hold em -- shut the car down --- your pedal should hold for about 30 seconds is the booster isn't leaking.

So Check that....


Then --- you've got a couple options....


Increase your pedal ratio to 4:1 or even 5:1 ---- if you can keep all things aligned properly....

Add an electric vacuum pump .....


Or junk that set up and run a good manual master cylinder and get your pedal ratio to 6 or 7:1 <this would be my choice>

Or go to a "hydraboost" boost system....