Thursday, June 2, 2011

Cbr f4 rear brake caliper problem?

i have a 1999 cbr f4 i changed the brake pads in the front and they work fine the problem i am having is with the rear caliper no matter how many times i pump and bleed them they dont compress the calipers seem to be stuck what should i doCbr f4 rear brake caliper problem?Maybe hold the brake pedal down with something and undo the reservoir top. Leave it overnight and any bubbles present that won't bleed through will exit the system via the open cap.



If this doesn't help take the caliper off and check the piston is actually moving when the pedal is pressed. Without pads it should be possible to pump the piston right out of the caliper, but stop before this happens. Clean the piston with WD40, push it back, then see if it moves out easier than before when the pedal is pressed.Cbr f4 rear brake caliper problem?Have you tried taking the caliper off and holding it so the hose has a gradual upward slope to the caliper so the air can travel up to the caliper and then be pumped out. Don't hold the bleed nipple higher than the bottom of the reservoir or it will flow backwards. Try gravity bleeding it rather than pumping it first, keep the fluid topped up, if air goes in due to low level, you will have to start all over again. It may be that your caliper piston is stuck, did it go back smoothly when you fitted the pads? Good luck.