Power or manual brakes?

[professor-patrick]

I've got a 69 charger with power brakes.  I've installed a new master cylinder, new wheel cylinders, new brakes shoes, new brake lines - everything except for the power booster.  I have very little brake - both feet all the way down is just starting to slow down.  What am I missing?  Do power boosters go bad, and does this sound like a symptom?  Thanks.

[Brock Samson]

yeah the master cylinders will lose pressure if they sit too long... like 15 years.. LOL!. Time for a rebuild..  
see the next thread..BTW: mine's sat for six-mos. and it's due...

[Plumcrazy]

Make sure the brake shoes are adjusted properly and you have bled the system completely

[Chryco Psycho]

did you bench bleed the master before installing it ?

[professor-patrick]

I've installed a new master cylinder - I did bench bleed it, replaced all the wheel cylinders, bled all brakes, new brake shoes, adjusted them all correctly - the only thing I haven't touched is the power booster.

[Chryco Psycho]

the pushrod between the booster & master is adjustable & may be too short

[Steve P.]

Sounds like air in the lines to me..


Oh waiter,,, More bleeding please....

[bull]

Maybe the diaphragms in your booster are bad.

[jgbailey57]

is it a hard pedal up at the top or is the pedal mushy and goes to the floor?   mine is a hard pedal and i can put both feet on it and when it's at an idle in gear the car will still move.   of course i don't drive it this way, but i almost hit the car in front of me when i pulled it into the garage because it wouldn't stop.  mine has power disc brakes.

[Steve P.]

Do you have discs or not?

[Tom_440]

If the pedal is firm, and doesn't go to the floor, but it takes 2 feet to stop, the booster is likely your problem.  Also, if you have inadequate vacuum to the booster, it will have the same effect.

[Ghoste]

Does the pedal feel exactly the same whether the engine is running or not?  How about if the vacuum line to the booster is disconnected (and plugged), does it feel any different?  Try hooking a vacuum pump up to the booster and pump it up a little and just leave it for a bit and see if the vacuum holds.