Rear brake binding...

[Bthorn]

So, I'm a newb and just finished with a carb rebuild. I found the tank and filter full of rust, so I replaced those, too. However, upon final assembly, i noticed the rear brake is binding up on the outside pad. Now, it seems that the axel washer should be on the inside of the caliper support arm, but the manual states it's supposed to be on the outside.

I don't remember where it was before. Like I said, I'm new to this. The carb rebuild and tank replacement were a pain and now I'm defeated by about 2mm. please help!

 

[Fire-medic]

Notice #22 goes outside of the rear caliper bracket.

#20 & 21 are the other end of the axle.

https://www.ronayers.com/oemparts/a/yam/50045c15f8700209bc794309/rear-wheel

 

[Bthorn]

So, I'm a newb and just finished with a carb rebuild. I found the tank and filter full of rust, so I replaced those, too. However, upon final assembly, i noticed the rear brake is binding up on the outside pad. Now, it seems that the axel washer should be on the inside of the caliper support arm, but the manual states it's supposed to be on the outside.

I don't remember where it was before. Like I said, I'm new to this. The carb rebuild and tank replacement were a pain and now I'm defeated by about 2mm. please help!

Looking from the rear,

View attachment 96651


Notice #22 goes outside of the rear caliper bracket.

#20 & 21 are the other end of the axle.

https://www.ronayers.com/oemparts/a/yam/50045c15f8700209bc794309/rear-wheel

View attachment 96651


Notice #22 goes outside of the rear caliper bracket.

#20 & 21 are the other end of the axle.

https://www.ronayers.com/oemparts/a/yam/50045c15f8700209bc794309/rear-wheel

Yep. That's what I saw earlier. I did flip the washer to the inside and the caliper slid in much easier. No binding. (Maybe the caliper support arm was bent?)
The brake works fine. I'm hesitant to ride it much but I couldn't make the other way work. I might have to start pulling parts and make sure they're correct. This might have been a "patch" for something else missing or rigged.

 

[MaxMidnight]

Have you checked that both caliper pistons move freely?

 

[Fire-medic]

Have you checked that both caliper pistons move freely?

A giveaway to that is the freely-moving caliper pad will usually wear more than the frozen side. Don't forget the trick of using a grease gun to free the stuck piston of the caliper, which requires a disassembly and cleaning-out of the grease, of-course. You remove the caliper, plug-off the caliper hose hole, and inject the grease thru the opened bleeder port. To clean the caliper, you need to disassemble the caliper halves. Don't lose the small rubber O-rings where the two caliper bolts are which hold the caliper halves together.

This is a SOHC Honda caliper but the principle is the same.



Here I'm bench-testing the disassembled, cleaned, and reassembled/filled w/DOT 4 brake fluid caliper.