SOHC.co.uk Forums > CB500/550
Can't fit rear brake in drum after fitting news brake shoes
Oddjob:
The shoes look ok mounted Alex, IF they were 750 ones they wouldn't fit. Everything is looking to be correct yet they won't fit. Try measuring the shoes mounted on the plate as per the pic and see what they measure out at their widest point. I do remember many years ago of members saying they had shoes which didn't fit as they just had to much friction material on them compared to the OE shoes. I think the cure was to sand them down until they fitted. I've bought SBS shoes but as yet I haven't test fitted them, must check them to see if they have the same problem.
McCabe-Thiele (Ted):
It's not an exact science but measuring the width with the shoes when in place it's 17.8-17.9 cms measuring from the centre section of the shoes.
K2-K6:
Take the shoes off the brake plate, then put each one inside the drum to see if there's difference in radius at any particular point around them.
Shoes are often shamferred at their ends to fit then in to the drum, if they touch just at the ends then you can file that ramp onto them easily to get them touching along their full length.
In other words, you may not need to file the whole brake material, just a "ramp" on the end location of the friction material.
McCabe-Thiele (Ted):
Is there a big lip on your drum liner by any chance?
McCabe-Thiele (Ted):
--- Quote from: K2-K6 on November 23, 2023, 10:35:50 AM ---Take the shoes off the brake plate, then put each one inside the drum to see if there's difference in radius at any particular point around them.
Shoes are often shamferred at their ends to fit then in to the drum, if they touch just at the ends then you can file that ramp onto them easily to get them touching along their full length.
In other words, you may not need to file the whole brake material, just a "ramp" on the end location of the friction material.
--- End quote ---
Good point K2-K6
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