My 630 rear brake no long seems to be working. When I push the pedal down, there is no grip or bite. It barely stops the bike when it is just rolling even. I have tried bleeding the lines and put new fluid in. Nothing has seemed to work. Wondering if anyone here would know what the issue could be.
Have you checked or replaced the pads and checked the rear caliper for leakage? How about the master cylinder? Any leaks apparent. Did you accidently get chain lube on the brake rotor when lubing the chain? Few things to look at.
Thanks, there is some oil on the rotor. Will clean it off and see if that fixes it. Besides that everything looks fine.
Check the pads. Check for excessive disc wear. Check for leaks. Back bleed - is in many ways the easiest method. I did my 610 on Sunday and was astounded at how much very dark crud fluid worked its way up out the master cylinder (was not visible normally in the reservoir). Also check the brake pedal travel - it may need some adjustment at the master on the threaded rod otherwise it can bottom out on the foot peg.
Just be sure you don't pre-load your cylinder, I've seen that happen when someone was trying to get more stroke in the cylinder, boiled the fluid in the rear caliper in a few miles.
Had just recently a similar situation. The rear break suddenly stopped working, bike would just keep rolling, pedal pressure felt normal. Cleaning the rotor didn't give any immediate results, after two days of ignoring the problem the rear break would start getting better and eventually got back to normal. Must have been some oil on the road, no idea.
I swapped to EBC HH sintered pads, front and rear. They're not that expensive and the brake feel is much better.
