putting my cb360 caliper back together?

[fiedler.casey]

Hey all, I just pulled apart the front caliper on my '75 CB360 which I recently came into ownership of. The front brake was sticking pretty bad so I pulled it apart. I found this (attached picture) white-ish plastic washer between the pad and cylinder, badly lopsided and pinched. The pad on that side is very unevenly worn, who knows how long the bike has been ridden with this. I can't seem to find this plastic washer in the parts diagram.

My question is: Does this plastic washer even belong in the assembly? The rubber caliper seal is seated in the cylinder where it is supposed to be, so clearly this part in question is not the piston seal. If this part is supposed to be in the assembly what is it called?

Thanks for any info.

 

[DrJ]

Probably there to absorb brake squeal.

 

[mydlyfkryzis]

Mine has it. It acts as an antisqueal and allows the pad to better self align.


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[crazypj]

Nylon washer you have is done for. It should be flat
The piston seal in top pic by OP is probably toast, when you get corrosion in groove it causes pressure hollows in rubber that don't release.
Also, the groove isn't machined 'flat' at the bottom, it's at a slight angle so the seal is tilted slightly presenting an 'edge' from the inside (also makes assembly a lot easier)