Limp Pedal

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Monaro

Monaro

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Having problems bleeding brakes, I have fitted new master cylinder (drums all round 69 cuda-with booster) Pedal is limp and sits on floor (can move it up and down) suprised that there no return spring (GM background) accourding to book, back pressure from master cylinder holds pedal in place is that right? but should'nt the spring in the booster push the pedal up into the operating position? or do I have other problems?](*,)
Cheers,
Paul
 
I agree most boosters have a spring that returns the pedal. You may need to preasure bleed the system to remove trapped air.
 
Monaro said:
Having problems bleeding brakes, I have fitted new master cylinder (drums all round 69 cuda-with booster) Pedal is limp and sits on floor (can move it up and down) suprised that there no return spring (GM background) accourding to book, back pressure from master cylinder holds pedal in place is that right? but should'nt the spring in the booster push the pedal up into the operating position? or do I have other problems?](*,)
Cheers,
Paul
Click to expand...

Nah, you just have lots of air in the lines.
Look into pressurized bleeding.
It's done from the wheels up instead of the master cylinder down.
One pretty much needs to know specifically how to bleed brakes otherwise.
 
Did you bench bleed the master cylinder?
 
Also have tried to draw fluid through the drums with a pneumatic set up however due to those bloody 1/4'' bleed nipples on front brakes have given that up as a bad joke.
 
Thanks to everyone for there help, It seems that you think the problem is air in the lines so I will just have to keep at it.
Cheers,
Paul
 
Can you pump the brakes up? Just wondering if the rod is making contact with the MC piston.
 
Monaro said:
Having problems bleeding brakes, I have fitted new master cylinder (drums all round 69 cuda-with booster) Pedal is limp and sits on floor (can move it up and down) suprised that there no return spring (GM background) accourding to book, back pressure from master cylinder holds pedal in place is that right? but should'nt the spring in the booster push the pedal up into the operating position? or do I have other problems?](*,)
Cheers,
Paul
Click to expand...

You have something wrong with the master cylinder or your push rod.
I have one sitting on my bench so I stuck a punch in the piston, pushed it in
and it pushed right back. If everything is right it will push your brake peddle
back up even with out brake fluid.

Kenny
 
Hemiroid said:
You have something wrong with the master cylinder or your push rod.
I have one sitting on my bench so I stuck a punch in the piston, pushed it in
and it pushed right back. If everything is right it will push your brake peddle
back up even with out brake fluid.

Kenny
Click to expand...

Mine did too, that's makes me wonder about the rod.
 
You need some of that brake pedal viagra. Hay....somebody had to do it.
 
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