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Looking for assistance on my rear disk brake Looking for assistance on my rear disk brake
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Photo by George Guille, It's going to be a long 300km... Bolivian Amazon

I haven't been everywhere...
but it's on my list!


Photo by George Guille
It's going to be a long 300km...
Bolivian Amazon



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  #1  
Old 16 Apr 2014
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Looking for assistance on my rear disk brake
Hi gang. I am looking for some of the awesome knowledge on this forum.

Over the winter I have been bringing back to life low-mile, but poorly treated 1990 XT600. Bought it off craigslist for only $500 and have put about $400 into it so far. Though it's still ugly, it is ready to ride... Almost. I have run into a problem and am asking for anyone with experience that can help.

The issue is the rear disk brake. The disk heats up in a short ride as the new pads are too tight against the disk. I have thoroughly cleaned the caliper and fittings, made sure the caliper piston moves freely, checked the seals, flushed the fluid with new, bled the system, and made sure the caliper has lateral movement.

The old pads were down to metal and I believe not properly installed. Where the pads fit there is a clip at each end. As the clips were bent, I am not sure how the pads should fit in relation to the clips. A parts list has not helped as it does not show proper assembly.

It is a single piston caliper on the rear, and so is different from the front in assembly. So help me get this poor old bike back to a proud and respectful state. Any assistance in solving this issue would be greatly appreciated.
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Old 16 Apr 2014
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If the caliper moves freely and dont understand how the pads can be to tight? The only way they can make this problem is if the piston dont move freely. What happens if you raise back wheel and press brake, can you move wheel after release brake?
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Old 17 Apr 2014
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Originally Posted by xtrock View Post
If the caliper moves freely and dont understand how the pads can be to tight? The only way they can make this problem is if the piston dont move freely. What happens if you raise back wheel and press brake, can you move wheel after release brake?
OK, I have confirmed that the spring/clips are indeed on the ends. the orientation of how the end of the pad (metal part) fit against the spring is where i think my issue is. i also confirmed there is no air in the line and the piston has full travel as well as the caliper has side to side movement. The pads were installed where the ends of the pad metal tips were underneath the clip, and i think it should rest against it instead. I will remove the spring/clips and try it without them to see if it still heats up, then get back. it has been a bit baffling -- thanks for your input.
More later.
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Old 17 Apr 2014
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The part on both ends of pad are suppose to be against the spring clip so its under pressure. Line them up on the end just before they fall out of clip. If you have pct of what you dont understand its easy to explain. Other than that its possible you have thighten the brake adjustmen to tight, when it get heat on the brake you get a little more pressure.
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Old 17 Apr 2014
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Originally Posted by xtrock View Post
The part on both ends of pad are suppose to be against the spring clip so its under pressure. Line them up on the end just before they fall out of clip. If you have pct of what you dont understand its easy to explain. Other than that its possible you have thighten the brake adjustmen to tight, when it get heat on the brake you get a little more pressure.
Thanks, I'll get a photo when I pull it apart again over the next couple days.
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