Posted by Gordon Maney from 67.251.155.7 (1Cust7.tnt3.cedar-rapids.ia.da.uu.net) on Monday, April 08, 2002 at 1:28AM :
In Reply to: Re: Drum brake squeak--TKS Gordon posted by Mark S. in Calif from 198.81.17.31 (spider-ntc-tc031.proxy.aol.com) on Monday, April 08, 2002 at 0:26AM :
The front brake is a fixed anchor brake, just like the WDX-WM300 truck.
The lower pivots are rarely adjusted. Do we know if they have been moved.... did you move the lowers? If so, that could be part of your problem. If the lowers are turned so as to raise the shoes, they will act as if the radius is wrong. Your squeak, in that case would just be one shoe, the leading shoe during the brake.... not that you could tell by ear if it was just one shoe.
With the shoe full out against the drum, you might like to find .004 to .007 inch clearance between the drum and each end of the shoe, or at least equal clearances. The shoe radius, even on one wear fitted to a drum will typically be just a touch smaller radius than the drum, that because the drum distorts under hard application of the brake.
You should have an inspection port in the drum. That is where you can measure. If you have to, pull the drum back off so you can move the adjusters and see how they work.
Your back brakes adjust in a completely different way....