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On my 1986 GPZ600 the rear brake siezes up when I use it.

The rear brake keeps siezing up when I use it. The pistons do not appear to retract far enough back to allow the pads to be clear of the brake disc.i have taken the caliper off the bike loosened the bleed nipple and had to use a ''g'' clamp to push the brake pistons back into the caliper. Next I thoroughly cleaned of*** dirt and corrosion paying attention to the two round steel rods/guides that connect the two halves of the caliper. The rods/guides have been de-rusted and polished up with emery cloth then greased with high melting point grease and have made sure that the brake pads move smoothly on these rods/guides yet the problem still persists. I cannot think of a reason as to why the brake pistons do not retract back enough after checking the fluid level and the brake hoses are free of any kinks or acute bends. The fluid appears to be getting pumped into the caliper from the brake pedal and slave cylinder but not returning or allowing the calipers to retract when the brake is released. So the proble

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The pistons themselves are generally the problem. The pins and guides just stop the pads from slopping about. Take pads out and caliper off and remove piston and clean out receptable. Check piston seal ring and dust (or packing) ring are not rolled, twisted or damaged. Your pads may even be worn too thin and plunger is having to push piston too far out and ring seals are not sliding on the smoother surface of piston receptable. Hope this helps. Below is a link to a typicall disc brake in exploded view form with part names.

Posted on May 17, 2010

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On my 1986 GPZ600 the rear brake siezes up when I use it.

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