[TR] Anti squeal shims

[Tom Note]

----- Original Message ----- 
From: "Randall" <tr3driver at ca.rr.com>
To: "'TR List'" <triumphs at autox.team.net>
Sent: Thursday, September 11, 2008 11:29 AM
Subject: Re: [TR] Anti squeal shims


>> I believe shims usually
>> have
>> a  "D" shaped cutout slightly smaller than half the diameter of the
>> piston.
>> Are these cutouts necessary , or would a plain shim work as well?
>
> I don't have any experience, Tom, but I believe the cutout is an important
> part of the squeal suppression.  I've owned a car that had only a cutout
> (notch) right on the lip of the caliper piston, with no other anti-squeal
> measures, and it's brakes never squealed.  The service manual mentioned 
> that
> it was important to turn the notch to the correct angle.
>
> Of course, that doesn't mean you couldn't try it without the cutout.
>
> Randall
> _______________________________________________
>
> I can see in the Haynes manual, the shims are arrowed as directional. What 
> I'm not clear on is whether the cutout exceeds the (half) diameter of the 
> piston, or if the entire D-shaped opening is inside the rim of the piston; 
> i.e., does the piston only make contact with a portion of the metal shim?

Thanks Randall.

Tom