I have a 454 in it, and thought that the engine could be heating up the brake lines, so i moved them away. I also replaced the master cylinder a year ago. Could it be the proportioning valve?
2007-04-18 05:09:28 · 11 answers · asked by Christopher M 1 in Cars & Transportation ➔ Maintenance & Repairs
Yes it can be the proportioning valve if you have a disk/drum set up. Typically it's the drums that will lock up before the disks though...
2007-04-18 05:13:45 · answer #1 · answered by hsueh010 7 · 0⤊ 2⤋
If you have drums on the front, it's possible, probable actually, that you have adjusted the shoes too tight. Unlike disks, which tend to touch the rotor slightly, the shoes should not. Drum brakes are adjusted to little or no drag at all...
The other possibility is the shoes are not retracting all the way, either from a broken return spring, or a cylinder piston sticking...either way, you need to pull the wheels and check carefully everything in there...
"Proportional" (misnomer really) valves don't normally cause anything like this, since all they do is shut off half your brakes when they shift...
2007-04-18 05:24:16 · answer #2 · answered by Michael B 6 · 0⤊ 0⤋
How about your front flexible rubber brake line hoses that connect the wheel cylinders to the metal brake lines? Have they ever been replaced? They break down internally and can trap brake fluid and maintain pressure on the brakes. Front calipers have pins that may need lubrication or replacement to make sure the calipers slide properly. Of course make sure there's no brake fluid leaking onto the front pads or shoes.
2007-04-18 05:16:58 · answer #3 · answered by bobweb 7 · 0⤊ 0⤋
Come on guys 70 Chevelles have drums in the front and rear.
Drums lock up usually when brake fluid gets on the shoes.
So the problem is most probably leaking wheel cynlinders.
2007-04-18 05:33:37 · answer #4 · answered by frigon_p 5 · 0⤊ 1⤋
Does only one side lock up or both? if its both, its more than likely the proportioning valve, if its only one side, its either a bad brake hose or a bad wheel cylinder..
2007-04-18 05:17:44 · answer #5 · answered by justme23005 2 · 1⤊ 0⤋
If they are disk brakes:
The calipers may sticking. They may need to be rebuilt or replaced.
The brake pads could also be installed incorrectly.
The brake caliper pins could be frozen. During maintenance, the brake caliper pins should be lubed with brake caliper pin lube.
If they are drum brakes:
The wheel cylinder may need to be replaced.
The brake shoes may be installed incorrectly
The brake shoes may be adjusted incorrectly
The automatic brake adjuster may be installed incorrectly or is malfunctioning
2007-04-18 05:20:04 · answer #6 · answered by Mad Jack 7 · 0⤊ 0⤋
I believe that you could have a bad brake hose on the front aloowing the brake fluid to be going to the calipers but not releasing it to go back to the master cylinder.
2007-04-18 05:15:28 · answer #7 · answered by Mi M 1 · 2⤊ 1⤋
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2016-12-10 05:24:10 · answer #8 · answered by ? 4 · 0⤊ 0⤋
It's the proportioning valve or the wheel cylinders.
2007-04-18 05:13:18 · answer #9 · answered by James B 5 · 0⤊ 1⤋
brake fluid leaking on to the drum causes this. You got a leak somewhere.
2007-04-18 08:13:43 · answer #10 · answered by MrZ 6 · 0⤊ 0⤋