Motorcycle’s back brake won’t squeeze/compress.?
Yesterday on my 2007 Hyosung gt250r, I propped up the motorcycle and took of the rear tire. I got a new tire and put it back on. When putting the brake caliper back over the disk, it would not fit over. I think my sister touched the foot pedal. I used some tools and opened the bleeder valve when opening the pads all the way open.
After reinstalling, there is no presser. It’s just a floppy pedal. I bleed the caliper in tell the air was out and tried pumping the pedal but there’s just no presser. I’m not sure what to do at this point. I can’t seem to get the caliper to squeeze the disk.
Also, There is no cracks or breaks in the line, its full of fluid, and there is no damage to the pads/disk.
Any help would be appreciated, thanks.
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If the system is as floppy as you describe a lot of air must still be in the system.
Are you sure that you have bled the brakes properly?
Did you pump it until clear liquid came out with no bubbles in it?
Did you make sure that the reservoir did not empty while you were doing that?
Always use a new bottle of brake fluid – it attracts water over time and water will compress under pressure.
Buy a new bleed nipple (they do corrode and get blocked over time), grease the thread, replace the old one – do not over-tighten. Stand the bike upright, otherwise pockets of air can get caught in the caliper.
Open the bleed nipple 1/4 to 1/2 a turn, connect a transparent tube, lead that to a jar on the ground with some fresh brake fluid in the bottom, make sure your tube is immersed in the brake fluid, take the lid off the reservoir, top it up with fresh fluid, work the lever, make sure that air bubbles and fluid are coming down the tube into the jar, at the same time make certain that the reservoir does not drain (otherwise you will have to start again), when the fluid coming down the tube is completely free of air bubbles shut off the bleed nipple and put the cover on the reservoir.
Check the brakes actually work before you ride away.
Keep bleeding the system, there is still air in there.
Next time don't bleed the brakes on a simple tire change, just gently force the calipers back enough to clear the rotor and since you shouldn't be riding hard on a new tire anyways take it easy on the rear brake for a little bit, it'll settle into place faster than that new tire.
you still have air in the line,here is how to make a mityvac! Get a clear plastic tube that fits over the bleed nipple and zip tie it firmly in place. Now get a new can of brake fluid and put the other end of the plastic line into the clean brake fluid. Now simply operate the pedal until it firms up,this method will push air out and suck only clean brake fluid in just like a mityvac!