vacum brake quest

[aa1320]

I just completed the conversion to vaccum brakes bled the lines the pedal is very firm but the car does not stop. it slows but takes forever to stop? I also put in new master cylinder. Any ideas on where to go next? When in gear it barely holds any idea would be great. thanks

 

[1quick6]

How did you provide vacuum to the booster and did you bench bleed the master cylinder before installation?

 

[Red Regal T]

Sounds like you're not getting enough vacuum assist. Do you hear any vacuum leaks? Sometimes you can hear a constant hissing down by your brake pedal. Do you have a vacuum gauge? If you're running a race cam, you won't have enough engine vacuum for vacuum brakes.

 

[aa1320]

yes I bench bled the master, and I purchased a new vaccum block for the manifold with fitting for the brakes.

 

[azbob]

First I would rebleed the brakes. I just did the changeover and bled the brakes enough to add a full pint of fluid. Works great and got air from all corners.

 

[aa1320]

re bled brakes today still no brakes.

 

[Sal 87WE2]

Is the booster new?

 

[1quick6]

Also, you do have the check valve inserted into the booster, right? If you don't have a check valve or it is leaking, you will have no vacuum to assist you. I know it is a dumb question, but just another thing to check.

 

[gmmuscle]

Just did this conversion on Saturday. Brakes are great.

=Advance Auto booster/mc for 86 non turbo regal
=vacuum block from cotton perf
=replaced vacuum hoses (non brake items)
=bled brakes (speed bleeders on front),bled rear by manual pumping
=drilled new hole 1.25" below old hole in brake pedal arm

Carl