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Joined: Dec 2007
Posts: 49 Likes: 1
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Dec 2007
Posts: 49 Likes: 1 |
Hello everyone,
I am restoring my father's 47 Chevy Convertible. We are 95% complete. The current problem is that all four brakes won't release after we adjust the brakes. The master cylinder has been rebuilt along with all brake cylinders along with new brake lines. We adjust the brakes and they seem fine until we drive it a few blocks and the brake pedal becomes very stiff with no travel and the brakes on all four wheels are very tight. We have gone through adjusting the brakes a couple of times and each time the brakes get tight and the pedal is stiff with no travel.
Any thoughts on what is causing the problem and/or what to do to fix the issues? It is like the hydraulic pressure won't release.
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Joined: Jan 2008
Posts: 806 Likes: 5
ChatMaster - 750
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ChatMaster - 750
Joined: Jan 2008
Posts: 806 Likes: 5 |
Sounds like the piston in the master cylinder is not coming back far enough to let the fluid return. An easy check is when they get tight crack open a bleeder on a wheel cylinder, if that releases the brakes then check the adjustment on the rod going into the master cylinder.
Dens Chevys 1927 Speedster 1928 coupe 1941street rod 1947Fleetline 4 door 1949 1/2 ton Pickup (sold) 1954 210 4 door 1972 Monte Carlo 2003 Corvette convt..
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Joined: Dec 2007
Posts: 3,487 Likes: 45
ChatMaster - 3,000
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ChatMaster - 3,000
Joined: Dec 2007
Posts: 3,487 Likes: 45 |
Dens41 is going good advice. It sounds like the piston is not coming back far enough to uncover the return port to the reservoir.
There should be a small amount of free play before the brake pedal starts to push on the piston in the master cylinder. Look in the shop manual for how to adjust toe board clearance.
Rusty
VCCA #44680
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Joined: Jan 2002
Posts: 30,116 Likes: 95
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,116 Likes: 95 |
instructions are in the shop manual.
Gene Schneider
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