KX Riders
Maintenance & Technical => KX250 / KX125 => Topic started by: Hmfc83 on December 21, 2016, 05:19:06 AM
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Hi my kx250 1999 model rear brake keeps seizing up after a few hours of use. I've renewed the calaper piston brake pads brake fluid the lot but still it locks up could there be a problem with the master cylinder ? Or if that was failing would I have no brakes any help ?
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it sounds like the caliper needs to be completely disassembled, and thoroughly cleaned/inspected, and be sure you don't need to replace any parts.
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a rebuild kit for the master wouldn't hurt...I've found it's best to use oem parts when rebuilding masters, on a couple occasions.
be sure your brake pedal is moving freely/smoothly on the pivot pin too....any sand or corrosion, can cause issues as well.
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The calaper was total stripped and cleaned the peg seems fine. It's like it over heats and locks solid for about 10/15 mins then it will fully release and I can nurse it back to the van. I could get a replacement seal for the master cylinder tonight but won't be able to fit it till tomorrow and then wait for a break in the weather to try it out but many thanks for the reply 👍🏻