Bubble. The thought that comes to mind immediately, is that the activating rod (the threaded rod between the brake pedal and the master cylinder) needs to be backed off a little. If the clearance here is insufficient, once the brake has been applied the seal in the master master cylinder can't come back past the relief hole, thus keeping the brake jambed on. Many riders often mistakenly use this rod to adjust the brake pedal height. The height on our 800's is NOT adjustable, although there a few work arounds to remedy this.
rear brake
hi ya on Sunday me and some chums had a ride out about 160 miles and we made good time no problems, Monday took front wheel off and new tyre fitted wheel replaced and gave bike a good clean, Tuesday short steady ride to bed tyre in 20miles in pulled clutch in to change gear bike slowed so stop to inspect thinking front brakes binding, but no rear red hot could not spin rear on centre stand, 20mins wheel freed rode home just using front brake till i got couple of miles from home started to use rear to see if it would bind again, today wheel off disc and pads ok wheel free been 50 mile ride no problem, i am sure did not cause this with having foot on brake peddle, any ideas people
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good point mate but i had covered 150 miles couple of days before, but to be honest i have slacked it off a bit im sure i did not have my foot on rear brake but i did think of that really good of you to take the time all the best Brett
+1 For what Redned posted. It's been discussed a few times on the forum, usually after a forum member has an issues just as you describe.
Lower oil level in back reservpir
My recommendation is to take the caliper apart and take a look at the piston. Circumstances like this is usually caused by stuck piston. It could be corrosion or build up of dirt or crud. In normal operation as pressure is let off the brake pedal, the disc would move the piston away from the disc as it spin. If there are obstruction or build up on piston, it would not allow the piston to “reset” in it position and continues to apply pressure against the disc. The easiest indicator is premature pad wear or worse red hot disc or stuck disc. You could buy caliper rebuilt kits. Which consist of two seals. One to seal the brake fluid from leaking and the other to keep dirt/dust out. I have done this to my F700GS before and many, many cars that I own (current and past). This usually happens when old fluid absorbs and build up moisture that causes corrosion inside caliper and pistons.
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