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Thread: Brake Issue...

  1. #1

    Default Brake Issue...

    I recently took the brake booster off. I put a master cylinder straight to firewall and hooked up rod and lines. Sitting on stands we bled brakes and have a good pedal and they stop. When you set it down they don't stop unless you stand on pedal. This is not going to work. Is there a difference in master cylinders for power and manual brakes? I'm pretty sure the one I got was for manual brakes. It was for a 77 GMC truck and it came with the brake rod. Any help on this?

  2. #2

    Default

    Ok since first post I changed master cylinder again. Realized I had one for power brakes. I got the right one for manual brakes and now the pedal is spongy. It stops better but just spongy. No where near where it supposed to be. Do you have to swap the lines around on the master? I have disc front and drum rear.

  3. #3
    Join Date
    Nov 2007
    Posts
    152

    Default

    Quote Originally Posted by smokem2024 View Post
    Ok since first post I changed master cylinder again. Realized I had one for power brakes. I got the right one for manual brakes and now the pedal is spongy. It stops better but just spongy. No where near where it supposed to be. Do you have to swap the lines around on the master? I have disc front and drum rear.
    You likely have air trapped somewhere. Find a connection in the lines at the high point in the system and bleed there.

  4. #4
    Join Date
    May 2007
    Posts
    157

    Default

    I had the same problem once and struggled to find an answer I used residual pressure valves 1 for front 1 for rear solved the problem and had great brakes

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