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Brake Problems... no pressure when truck running

Discussion in 'The Garage' started by goblazeinco, Feb 13, 2004.

  1. goblazeinco

    goblazeinco Registered Member

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    I have an '86 K5 with power brakes. I recently replaced the master cylinder, front calipers and did the disk conversion on the 14bff rear. I used the Dana 44 disks and calipers on the rear.

    My problem is that when the truck is off the pedal is very firm...but when I start the truck the pedal goes to the floor. Its not a bleeding problem...trust me ..I have bled the master and all the calipers to the tune of 4 quarts of fluid.

    Does anyone have any better ideas than taking it to a shop?
     
  2. Poohbair

    Poohbair 1/2 ton status

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    Might be a bad power booster
     
  3. 4xcrazy

    4xcrazy 3/4 ton status

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    I'm thinkin ya got a bum master cylinder, i have had power boosters go bad, and when they did the pedal was harder than manual brakes. You said you installed a new master cylinder? where did you buy it at? /forums/images/graemlins/thinking.gif
     
  4. Muddytazz

    Muddytazz 1 ton status

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    If your not getting any pressure, replace the master cylinder and you'll be golden /forums/images/graemlins/thumb.gif
     
  5. goblazeinco

    goblazeinco Registered Member

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    The master is from Auto Zone. Thanks for the help guys, I will probably swap out the master again and see what happens. Once I get some pressure I can see if I need a proportioning valve for the larger rear brakes. I have read that some people need them and some people dont.

    Well, thanks for the help.
     

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