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Puzzling brake question.

earlfor

earlfor

Forum Guru
Past Site Supporter
TGSR Superstar
Charter Member
The front and rear brakes are both disk. The front brake calipers do not use a anti squeal shim and never squeal. The rear brake does use a anti squeal shim and will squeal loudly if it is not installed. Why?
 
My bike uses shims on the front, none in back. The squeal is directly related to how stiff the mounting is. If the caliper/pad can vibrate in sympathy with the minute oscillations caused by minor irregularities in the disk, then you have the noise. The shim dampens this out.
 
Any springs in there, instead of shims? They can reduce the rattling and squealing, too.

Why the difference? Might have something to do with single/opposing pistons. :-k

.
 
Springs are to stop the pads from rattling in the caliper. Shims are between the pad and piston to stop squeal. There is a grease sold for this purpose as well.
 
Steve said:
Any springs in there, instead of shims? They can reduce the rattling and squealing, too.

Why the difference? Might have something to do with single/opposing pistons. :-k

.
Click to expand...

There are no springs or shims on the front brake calipers, but there are springs and shims on the rear brake.
Maybe the difference is due to the front using pistons on both sides of the rotor and the rear having a piston on one side only that causes a squeal.
 
earlfor said:
There are no springs or shims on the front brake calipers, but there are springs and shims on the rear brake.
Maybe the difference is due to the front using pistons on both sides of the rotor and the rear having a piston on one side only that causes a squeal.
Click to expand...
On (most) GSes, the fronts have a single piston and the rears have pistons on both sides.

However, they all have a spring of some sort to keep the pads from rattling around. Squealing can usually be quelled by application of brake lube between the piston and the pad. If you have some sort of pad on the back of the piston, put the lube between the piston and the shim. I usually also clean up the sides of the pad and put a touch of lube there, if it rubs on the caliper anywhere.

.
 
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