Help with brakes!!
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Help with brakes!!
I have recently bought a 78 F-150, that has no brakes. First I thought brake pads would fix it since the others were wore out. I replaced pads on back, front seemed to be ok. Next I thought master cylinder, so I replaced it. Still didin't fix it. I have no visible leaks. Brakes have been gravity and pressure bleed. Any ideas?
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It has very weak brakes. Im getting frustrated cause I think I have checked everything. I've heard the PPV valve might be bad so that will be the next thing I check. When I bought the truck a month ago I had brakes, no after replacing rear brake pads, lines, and new wheel cylinders the braking has gotton worse.
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From: lisbon ohio small town
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Most Great Brakes don't lock up.
I suggest you have a BPPV problem. (Brake Proportioning Valve)
They rust up inside from sitting (Brake fluid absorbs water)
I bet the truck has been sitting for while ?
I suggest you have a BPPV problem. (Brake Proportioning Valve)
They rust up inside from sitting (Brake fluid absorbs water)
I bet the truck has been sitting for while ?
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I appreciate all the help. I've thought about the valve also. Although the truck hasn't been sitting all that long. When I bought the truck a month ago the brakes worked fine. The seem to just be getting worse. The more I do the more frustrated i get. is there any way of checking the valve to see if its working right. I don't think you can just buy a new one. Also I will check the vacuum hose as well.
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From: Calgary Canada
Originally Posted by Mil1ion
Most Great Brakes don't lock up.
In this case, I also suspect the prop valve or the master cylender
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I had a problem that sounded very similar to yours with my 78 and I replaced the entire brake system minus the ppv because they cant be bought at the parts store and it didn't fix the problem. A week later I pulled one of a truck in a junk yard and lo and behold my brakes worked fine. I believe that will fix your problem. Was the MC bench bled when replaced. I also had a problem because of that.
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yes the MC was bench bled. I will replace the PPV valve and re-bled the system and hopefully it will fix the problem. Keep thinking though because of my luck it wont and I will still need advice.
