Hello,
I need some help with my brakes. First I replaced my power booster and then started to bleed the system. I have a disc/drum setup on my 69 Chevelle as I was bleeding the backs first the pedal was working fine while pushing during the process but when I started the front after the p/s caliper I started the d/s and the pedal became almost impossible to push down and I noticed the brake fluid pushing up in the M/C. What could be happening or what I did wrong.

Thanks Scott

Is that with the motor running??

No this was just bleeding them without the motor running.

Scott

When the motor is off, you have no power assist, so the pedal will get VERY FIRM after a lot of pressing. This is normal. Try starting the car and see how the pedal feels.

Thanks,
The pedal is still hard, It will stop the but the pedal barely moves down. I know with my low vac. of 8-10" with my cam I will not have enough to operate booster correct?

Scott

I believe the recommended vacuum is 18 inches to operate correctly. So most likely you will have poor brakes like I did with 7 inches at idle in gear. You have a couple options like an electric vacuum pump or dual diaphram booster or just going manual. However, your best option is going Hydroboost if you want to spend the coins and you want awesome brakes. You have to have a powersteering pump though.

Thanks,
The pedal is still hard, It will stop the but the pedal barely moves down. I know with my low vac. of 8-10" with my cam I will not have enough to operate booster correct?

Scott

Scott,

Sounds like you got the air out, are you ready to road test? Maybe with some RPM you will see a softer pedal feel which will back up your low vacuum thought. This is the case on my car at idle due to the cam.