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Old 01-13-2003, 23:59   #1 (permalink)
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confused Binding brake

Hi all,

Having just renewed the rear pads on my 97 XH with 4 wheel discs, one rear wheel is now binding.

I've bled the whole system (fitted new bleeder valves), and checked that the handbrake isn't stuck on (totally disconnecting it at one stage).

Any ideas????
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Old 01-14-2003, 00:28   #2 (permalink)
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AusXH

I got my rear pads replaced as well. My mechanic said that the rear passenger brake seized up and sometimes doesn't disengage.

What he did was take apart the whole brake valve/caliper.. and replaced the seals as they were worn. He also gave it a good clean, removing and draining all the brake fluid inside it. By the way was it really hard to remove the pads???

Coz thats the sign of a seized caliper, which means replacing the seals. Hope this helps mate.
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Old 01-14-2003, 00:31   #3 (permalink)
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Have you checked the operation of the slider pins on that caliper? they can bind, especially if the rubber boot is stuffed and when you put new pads in, it used a new part of the shaft which could have dried. Easy enough to fix, pull bolt off, remove boot and clean/lube with grease.

OR

I'm hazarding a guess here and assuming the rea brake setup is the same as EA's. The handbrake setup is pretty dodgy on these.
Check that the leaver on the back of the caliper is resting on its 'stop' on the caliper (its a square raised section cast into the caliper body), if its not the piston is being pushed causing the brake to engage slightly.

OR

Did you screw the piston in as far is it would go?, it will auto adjust itself after.

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Old 01-14-2003, 00:39   #4 (permalink)
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Yeh they are the same as the EAs... so check out the caliper and the seals.
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Old 01-14-2003, 00:41   #5 (permalink)
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The brake pads themselves were easy to put on once I figured out how to do it. The piston screwed back into the caliper fairly easily.

Kieron

The slider pins are in perfect working order...

When I checked the handbrake I made sure it was returning to the 'stop' bump on the caliper...

and I screwed the piston in as far as it would go. Even tried re-doing that caliper (winding it all the way back in) and it still binds.

One thought I have had is that because it has a 1 tonne suspension setup, it has some sort of brake bias controller which is attatched to the diff. i.e the lower the diff the more(?) rear bias. Since my car is lowered and I havn't adjusted this controller maybe this is causing the binding? (but why only on the rear left wheel??) I'm having a go a resetting this controller ATM.
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Old 01-14-2003, 01:27   #6 (permalink)
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Might be worth giving the rears another bleed just in case? especially the right.

Apart from the seals as EA said, the only other thing I can think of off the top of my head is the shaft inside the caliper is slightly bent and doesn't allow the piston to retract or the piston itself is binding.

From memory the seal kit is about $36, and consists of the slider pins boots, piston dust boot and a rubber ring for the rear of the shaft. The piston I can't remember, but it may have a flat rubber band around it too which would be the obvious one to cause this problem.

How far did the piston go back in XH? in the past, ive been able to screw it in so its at least level with the caliper body, then just realign the key on the piston with the pin on the caliper with maybe an eight of a turn.

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Old 01-14-2003, 03:55   #7 (permalink)
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Okay, found the problem.

Pulled the calipers back off and found that on the side that was binding, the key on the pad was slightly off centre of the slot in the piston and caused the pad to be squashed at an angle.

So simply slotted the pad back into the slot and made sure that while putting it back on the rotor I didn't knock the pad out again.

Thanks for your help fellas. :s4

On the plus side, my handbrake is now perfectly adjusted and there is definately no air in the brake system.
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