Maintenance & Technical > KX500 Original

KX500 Front brake Caliper ceasing up

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KX500freak:

--- Quote from: dans89kx500 on May 17, 2008, 09:43:03 AM ---Yes, the caliper has been hidden behind a cover since the beggining of time. Also, when I freed the bleeder it relived the pressure (brake fluid blew all over my face) the wheel did spin and the pistons were able to be pushed back in.
Thursday and today, I had this problem. The heat outside both days was over 100 degrees.

Dan in Vacaville

--- End quote ---




well Dan,


did you solve your issue on that caliper yet :?
kinda curious what was the problem after all

demographic:
If the pressure is maintained when theres no lever pressure I would also check out the master cylinder and maybe give it a rebuild.
Sounds like the brake master cylinder piston isn't returning to the point where the fluid can return back into the resevoir.

tharden:
Something else to check is the brake line. Check for kinks, and if a break line gets to old the inner layers will separate and act like a check valve and cause this problem.

Mick:
Hey Dan I got an '89 too that had that same problem.  It's already been mentioned once before but I'll through it out there again.  Check the play at the lever.  Maybe the older models are a bit prone to this, but when the lever is too tight the caliper gets hot with use and the fluid expands and pushes against the lever.  When the piston can't push the lever anymore the only other place the fluid can expand is at the pistons in the caliper.  Hence the lock up.  When the front end locked up the lever was completely solid, I could not move the lever a fraction of an inch.  If this sounds familiar just add a little play in the lever and you should be good to go.  That was all I had to do.  Well...and replace a heat warped rotor but you get the idea.

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