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Username Post: Power disk brakes        (Topic#363950)
Fields 
Poster
Posts: 96

Age: 81
Loc: Klamath Falls, OR
Reg: 03-06-17
01-11-21 01:43 PM - Post#2811863    

I have a problem and was wondering if anyone else has experienced it. OK, I have a 54 chev that had original power brakes, but was not happy with the way it stopped, so I bought a disk conversion for the front. everything went together fine, then I bought a 7 inch booster and master cylinder and installed it. I had to extend the shaft to the booster. I used the original brake pedal and everything seemed to hook up right, but, now the problem I have no brakes and the pedal has no travel; solid movement. consequently no brakes. Has anyone had a similar experience?

1954 Chevy Bel Air Convertible





John


 


38Chevy454 
Newbie
Posts: 5

Loc: Cincinnati, OH
Reg: 05-12-20
01-13-21 10:05 AM - Post#2812009    
    In response to Fields

Dumb question number 1, is the brake pedal completely unable to move? Because it takes some force to override a power booster when there is no vacuum (engine off). Press on brake pedal hard, it should move even with engine off. Or start engine and ensure you have vacuum, it should make easy to press pedal.
Dumb Question number 2, is the brake rod bottomed out or hitting on something such that there is no travel?




 
Fields 
Poster
Posts: 96

Age: 81
Loc: Klamath Falls, OR
Reg: 03-06-17
01-13-21 06:55 PM - Post#2812029    
    In response to 38Chevy454

pedal is rock solid. I disconnected the master cylinder from the booster today to see if it moved, it didn't so now I am going to check the rod travel, I don't know what I'm missing. By the way I installed an vac. pump plus the engine vac.

1954 Chevy Bel Air Convertible





John


 
Fields 
Poster
Posts: 96

Age: 81
Loc: Klamath Falls, OR
Reg: 03-06-17
01-20-21 02:33 PM - Post#2812494    
    In response to 38Chevy454

There is no travel on the pedal, pedal is solid does not move the booster rod, or the rod into the master cylinder. I disconnected the MC from booster, and pressed the pedal and the rod moved , but still hard. I took the MC off and bench blead it , and there was a bit of air. so put it back on and still same. then went to vacuum lines, I have a vacum pump hook to engine vacuum, didn't seem to matter, with engine running if you really pressed on the brake pedal it brake the car but really hard pedal.

1954 Chevy Bel Air Convertible





John


 
tommy49 
"5th Year" Silver Supporting Member
Posts: 3011
tommy49
Loc: Kaleva, Michigan
Reg: 09-28-12
01-20-21 04:19 PM - Post#2812496    
    In response to Fields

What components are in your system? Proportioning valve, adjustable bias valve, residual pressure valves for underfloor MC? How about a drawing? The more we know, the better.

Tommy

49 Deluxe Sport Coupe, 4.8/4L60E swap in progress, MII IFS, Blazer rear axle, 4 wheel power disc brakes, power steering, air conditioning.

https://www.flickr.com/photos/tommyfortynine /album...




 
Shepherd 
Frequent Contributor
Posts: 2209

Loc: Lake George, NY
Reg: 11-11-15
01-20-21 04:44 PM - Post#2812501    
    In response to Fields

How is the angle from the pedal rod to the booster?



 


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