Rear Brake Failure - Kawasaki Ninja 250R Forum
 
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post #1 of 3 (permalink) Old 08-20-2013, 06:44 AM Thread Starter
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Location: Gladstone,Queensland, Australia
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Rear Brake Failure

Hi all so i have an issue with my rear brakes. At first the brake pedal was actually sticking it wasn't fully locked though because when i first noticed it on the way to work i pulled over and still could roll the bike just with increased resistance. When i got on the bike after work it had released but as soon as i pressed the pedal it stuck again. Now i have lost pressure all together (lines are fine) but the the pistons on the caliper haven't retracted. I've taken the caliper off and the old pads out and cleaned it up. I then tried to push both pistons back in at the same time just as if you were replacing the pads but i cant get them to budge however i can move one piston at a time and if i undo the nipple on the caliper and push one piston fluid comes out I also have a full reservoir So my question is has anyone ever experienced this and does this mean that i need to rebuild my master cylinder or is it possibly in my calipers?
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post #2 of 3 (permalink) Old 08-20-2013, 06:51 AM
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Could be that your master cylinder is gunked up and should be cleaned or rebuilt. In most bikes, if the release vent in the MC (a tiny hole) is blocked, pressure can build up and lock the brake like that.

Or it could be that the caliper pistons are pitted and binding in their bores, although the fact that you can move them if you release the hydraulic pressure indicates that they are not the problem.
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post #3 of 3 (permalink) Old 08-23-2013, 06:15 PM
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I agree with Bob.
The return hole in the master cylinder is likely blocked.

Also, I'd suggest removing the caliper all together from the line (you may need to use a soft clamp to avoid loosing fluid) and using a vice to hold it in place, pull the pistons all the way out.

Often they can get a build up of corrosion, or a seal on the caliper comes apart and sticks the brakes on a bit.

A good clen with emery paper, or a new piston, and possibly a new seal could fix the problem.

Definately remove the master cylinder and clean the ports out too though.
Best to eliminate all possibilities.

Last edited by MStagg; 08-23-2013 at 06:19 PM. Reason: Spelling / Reference errors
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brake, brake failure, brake issue, failure, rear

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