41 Years of Service

Username Post: Brake pedal rebound problem.        (Topic#327630)
ACinSD 
Forum Newbie
Posts: 55
ACinSD
Age: 41
Loc: San Diego, CA
Reg: 04-25-09
08-16-15 12:12 AM - Post#2569050    

I installed a CPP power master cylinder with 8" booster. When the engine isn't running, pedal is nice and tight, has good rebound, zero issues. As soon as the engine is running and the brakes are applied, the pedal doesn't rebound. What would be causing this to happen? If I pop off the fitting on the booster you can hear it suck air and the pedal returns to normal. Apply pressure again while running and it's the same story, no rebound.

The engine is a 283 with original style 2 barrel intake. We used the rear port on top of the intake for our vacuum line connection.

Any ideas on what may be causing the pedal to stay to the ground and the booster not burping?




 
ACinSD 
Forum Newbie
Posts: 55
ACinSD
Age: 41
Loc: San Diego, CA
Reg: 04-25-09
08-17-15 08:39 AM - Post#2569334    
    In response to ACinSD

Rod length adjustment was the solution. It's was too long and preloading the master cylinder.



 
Chevelle 
ChevyTalk Social Media Manager
Posts: 847
Chevelle
Loc: San Clemente, CA
Reg: 08-31-13
08-18-15 05:27 PM - Post#2569675    
    In response to ACinSD

Thank you for providing the solution Ari. Hope it helps others.


Chevelle

Become a Supporting Member and we'll turn off the ads!!!


 
double_dave 
Poster
Posts: 14

Reg: 06-07-16
05-06-18 09:58 AM - Post#2733173    
    In response to ACinSD

Hey - I had the same issue after fitting a kit for my 54 Bel Air. I don't know what your kit consist of but I bought a CPP firewall mount peddle assembly and a disc brake kit. Had decent peddle and return with the engine not running, but with the engine running supplying vacuum it wouldn't return all the way making the brake light stay on and the brakes binding slightly until I lifted the peddle with my foot - would slightly 'clunk' when I did that.

Anyway - after swapping out the booster and scratching my head for a while the problem was actually really simple. The kit didn't come with a return spring! Most manual brake peddle assemblies have a return spring to help the boost come back properly, but this didn't. It cost me $2 at a local hardware store - threw it on and now works a charm.




 
Icon Legend Permissions Topic Options
Report Post

Quote Post

Quick Reply

Print Topic

Email Topic

1708 Views
FusionBB
FusionBB™ Version 2.1
©2003-2006 InteractivePHP, Inc.
Execution time: 0.334 seconds.   Total Queries: 12   Zlib Compression is on.
All times are (GMT -0800) Pacific. Current time is 07:31 AM
Top