piddy
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| posted on 1/11/08 at 04:15 PM |
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Rear brakes sticking
Hi. When I first put my car on the road, I had a problem where the rear brakes would bind more then they should while driving. This seemed to be
happening after I had parked up and pulled the handbrake on full. I made adjustments to the handbrake cables and the problem seemed to go away. This
has been Ok for well over a year.
Well today I took the car for its MOT and during the brake test (after handbrake check) the rears started to bind again. The MOT inspector said that
it wasn’t a handbrake problem because the cables had realised and it must be a hydraulic problem. After leaving the MOT centre I gave it some heavy
braking and made the problem worse than ever (I can normally brake as hard as I like) after a couple of miles and some very hot brakes they realised
off again. My thoughts of possible causes damaged/crushed brake pipe, debris in pipe causing a blockage or a faulty master cylinder. Or maybe its
still hand brake related
Has anyone else encountered this? Got any other ideas what might be the cause please?
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eznfrank
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| posted on 1/11/08 at 04:18 PM |
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Drums or discs? (apologies if it says in your post, i'm on the phone and screen is a bit poxy)
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piddy
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| posted on 1/11/08 at 04:24 PM |
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sorry disks
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Chippy
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| posted on 1/11/08 at 04:31 PM |
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Could be sticking calipers, have they been overhauled? I had the same problem, but with the front brakes, had them re-engineered by "Big
Red" and had no further trouble since. HTH Ray
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
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piddy
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| posted on 1/11/08 at 04:34 PM |
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Brought them new/reconditioned
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minitici
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| posted on 1/11/08 at 05:19 PM |
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Do you have a twin master cylinder layout with balance bar?
If so, is the rear master cylinder rod fully returning - if it does not then fluid is trapped in the rear circuit and lock the brakes. It gets worse
the more you push the brake.
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piddy
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| posted on 1/11/08 at 05:27 PM |
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Yes I have a twin master cylinder layout with balance bar.
What makes the rod fully return?is it the pressure in the system?
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minitici
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| posted on 1/11/08 at 05:30 PM |
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The rod should return on its own accord - problems are usually due to the rod being adjusted too long or the pivot/slider part of the balance bar
being siezed.
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rusty nuts
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| posted on 1/11/08 at 07:17 PM |
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Easy to check if the master cylinder rod is overadjusted, just crack off one of the bleed nipples with the car jacked up and brakes binding . If the
brake frees off after cracking nipple then the master cylinder is holding pressure so rod to rear cylinder may be too long. If brakes don't free
off then let off handbrake adjustment and recheck. If brakes are still binding then the pads may be sticking in the caliper, might be worth taking
them out and cleaning , refit with a bit of copper slip . HTH . Mel
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