brake caliper question

[knut]

hi, a question for the collective,while checking the front brake pads on my a4,i noticed there,s no shim behind the pad on the piston side,is this correct ? i checked a spare caliper i had and that was the same, going by the haynes manual i,ve got ( z1000 manual) it shows a shim
confused or what

plus both the calipers have different looking pistons ,pictures below.
caliper fitted to a4,


spare caliper,[/list]

[tlc]

The first picture shows the piston with an insert inside which was designed to stop the squeal. If you buy a NOS piston it will not have this insert.
I have not seen the second piston in the pic before but could it have another type of insert ?
Sometimes when you buy pads they have the shim you are missing. Maybe ask Z Power next time you order some to send a set with the shim. The pad in that case would have a peg on it to secure the shim.

None of these things are necessary and none of them stop the squeal. Copaslip is the only thing that does !

[HowieD]

Hello,
My Z1-R had the second type of piston. I seem to remember reading it was to stop heat transfer from the Sintered Metal break pads that came into fashion about them.

Regards
Howie