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I have a very good friend who has a perplexing problem with his naked 1976 GL1000. After a run, maybe even as short as 20 minutes, his rear rotor is so hot he's afraid to touch it for fear of second-degree burns. The rotor on my 1500 will be warm to the touch after my 30-mile commute, but nothing like this. He's rebuilt the rear caliper, cleaned out pedal housing, replaced pads, put the Dremel to the rotor to get the glaze off, and it's still very hot. Any ideas would be appreciated. Have a great fall weekend, but don't fall.



ha ha
 

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Does the pedal feel very solid without much movement after the rotor gets hot? If so the small, and I do mean small, return hole in the master cylinder could be plugged.
 

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since the pads are new? then they probably have to wear to the disk grove, while on the center stand and the wheel off the ground, how hard is to move it by hand??
 

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I vote for plugged Master cyl hole. Next time it getshot put it on he center stand, give the wheel a spin and see if it has a drag, which it probably will, thenopen the bleeder and see ifthedrag is gone.
 

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Because the pads and disc get so hot and do not lock the wheel down I'd look to the pucks and seals to be binding. The pucks do not retract into the caliper cyl. Theyjust relax and leave the pads barely touching the disc. If as suggested cracking the bleeder doesn't relieve system. Some times on replacing the seals the groove seat has a layer of varnish or dirt build up that doesn't come out and it willin effect cause the o ring to seize the puck not allowing it to relax after being applied.:waving:Keno
 

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I vote for tiny hole in rear master cylinder also!! I recently rebuilt my rear MC twice ( cleaning out that hard to find, tiny hole) because the brakes were not releasingall the way causing the rotor to get so hot, I could spray a little water on it and watched it sizzle :shock:!!! Now they release with no problems :action:!! Good Luck:coollep:Bob
 

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on my 1200 it was working fine before new pads, i was pulling my hair till decided to wear the pads a bit now works perfectly, all after a 50 km ride.
 
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