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06-29-2022, 08:50 PM
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#1 |
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Blue 67
Join Date: Apr 2004
Location: Western WA
Posts: 1,179
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Soft brake pedal
Hello:
I am in the process of my LS swap conversion on my 1953 truck and I am having issue with soft brake pedal. Here is the history: The 5.3 engine is from a 2001 silverado and the the brake booster and MC are form a 2001 suburban with the same size engine. I have bled the brake many times, the pedal firms up when the engine is off but as soon as the engine is turned on, the pedal gets very soft and goes to floor if pressed. YThe pedal has the feedback, it doesn't stay at the floor but you can just very easily push it to the floor with hand, no resisatnce? I thought the booster was an issue (junyard sourced for the mockup purposes) but when I changed that with the donor vehicle (which was running and stopping fine) I still have the same issue. The MC was bench bled ( Ihave done these few times, not that I am an expert though) when installed, I don't have any leak from the lines that I can see. I have a mityvac bleeding system which I have been using. Thanks for the help
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1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner |
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