Can't fit rear brake in drum after fitting news brake shoes

[alexdecker]

Hey all

Just installed new brake shoes from CMS bought specifically for my model. But after installing them, I can't make them fit into the actual drum. The brakes are fully retracted, but they just won't fit. Am I missing something here? Usually it goes in really easy and is actually slightly loose.

These are the brake shoes I bought: https://www.cmsnl.com/products/shoesetbrake-non-oe-kevlar_06430390405p/

And then I bought a new brake cam as the old one broke: https://www.cmsnl.com/products/camrear-brake_43141374000/

- Alex

[Johnny4428]

Hi Alex my new shoes I just fitted were a tight fit in the actuator recess, make sure they are seated properly, I would even take a file to the ends to make fit easier. And obviously make sure you have the right shoes.

[alexdecker]

Hi Alex my new shoes I just fitted were a tight fit in the actuator recess, make sure they are seated properly, I would even take a file to the ends to make fit easier. And obviously make sure you have the right shoes.

Hey, thank for the input! Can you elaborate what the actuator recess is?

[Bryanj]

The flat spots on the cam that the flat end of the shoe fits into

[alexdecker]

So found out these are Vesrah brake shoes. And they fit perfectly in the actuator recess. So I guess they just aren't a fit in general, or that CMS sent me the wrong ones…

[McCabe-Thiele (Ted)]

I'd check the part number of those supplied against the manual.

[alexdecker]

I'd check the part number of those supplied against the manual.

Here is the part number of the Vesrah brake shoes: VB128S

And here is a picture where I have overlaid the new brake shoe on the old one. You can clearly see that the Vesrah shoe is quite a bit longer. No wonder it didn't fit into the drum.

[Bryanj]

You bought 750 ones which are bigger than 500/550 the middle part number should be 323 not 300

[alexdecker]

You bought 750 ones which are bigger than 500/550 the middle part number should be 323 not 300

Really? I know this might be misleading, but even on the packaging it says it should fit my bike?

[Johnny4428]

Just a thought Alex, is your rear wheel hub original or correct for your bike?

[Bryanj]

The cms link you posted says they are 750 by the part number, when fitted use a tape measure to measure the diameter of the shoes, there is also a max dia cast inside the drum.
Also has it been relined and machined too small?

[Oddjob]

I'm wondering IF the rear drum has been replaced by a previous owner as the 500/550 drums are renowned for cracking, maybe something like a CB500T was used instead.

Any pics of the inside of the drum and the drum in general Alex so we can see if it looks correct.

[McCabe-Thiele (Ted)]

Would the inside diameter of a 500 brake hub be handy - it's just slightly under 18.0 cm between the inside edges of the liner measured with an expanding ruler. That probably 17.98 -17.99 cms.

Amended I can't read my stupid tape measure.

[Oddjob]

Stamped on the inside of the hub Ted

[McCabe-Thiele (Ted)]

If that's the case Ken then Alex should easily know if he has a 500 hub.

Only markings in my hub are E-7 & opposite B 1 3

My error it 18.0 cms less a tad not 8!