Sticking rear brake

[howiezowie]

Rode my 650 TA for the first time in a few months last weekend and felt the rear brake hold on briefly.
Gave it a few shoves and it felt like it released OK but when I checked after 5 minutes, the disk was really warm.
Now there is no sign of a problem but I want to check, so asking for advice.
Do I pull the calliper retaining bolts and check for dryness or corrosion ?
I think they're supposed to be greased to allow calliper to move.

Any advice appreciated.
Cheers
H

[YEN_POWELL]

Check the foot lever first, they never get lubricated on their pivot and can stick when you push on them, then check the caliper.

Discs get warm even if you don't use them, the pads should be brushing them lightly all the time.

[AIRWOLF]

Most likely to be corrosion on the caliper piston, or corrosion in the groove that the dust seal sits in (it pushes the seal too tight onto piston).
and yes, the caiper must move freely on the carrier

[Kakugo]

Strip the rear caliper and check for signs of corrosion or (more likely) stone chips between the pad and the pistons. Give everything a good clean, apply specific grease where needed and it should be as good as new. Not much that can wrong there.

[Austin]

I had this a few months back - it was the lever pivot. Its a bit of a bugger to strip and lube but I am sure you will work it out. There's a thread on here about it started by me, but also including some good tips from others that I didn't spot while doing it.

The caliper should move fairly freely on its sliding pins - a good bit of heave-ho and you should be able to push the piston back into the caliper by pressing on the caliper while its on the bike. Then the whole caliper should slide fairly easily. Once you have done that you can see if its the lever as it will take 2-3 presses through its full movement to pump the pistons back into place and you will see if its sticking - mine was but only for the last mm or so of its movement, but it was enough.

If the caliper won't move much or is stuck remove the retaining pin and lift the caliper off, and I can't quite remember what you then need to do to split the 2 halves of the caliper - but its easy enough - and I don't think they are screwed together (but then again I can't remember from last time I did this) but the various seals can make it look like they are. Then rub down all the slidey bits with emery and grease it up with coppaslip or similar.

If its neither of these fix it I think its time to pump the piston out clean it up/replace it and fit new new seals. Wemoto was the cheapest (just) last time I did it all.

If its none of the above I haven't a clue.

good luck