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?
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Komorebi-The light filtering through the trees.
I would rather sit on a pumpkin and have it all to myself than be crowded on a velvet cushion. H.D.T. -
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.Current Rides: 1980 Suzuki GS1000ET, 2006 H-D Fatboy, 2021 BMW K1600B -
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.
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mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
#1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
#2 son: 1980 GS1000G
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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.Current Rides: 1980 Suzuki GS1000ET, 2006 H-D Fatboy, 2021 BMW K1600BComment
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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.Komorebi-The light filtering through the trees.
I would rather sit on a pumpkin and have it all to myself than be crowded on a velvet cushion. H.D.T.Comment
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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.
.sigpic
mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
#1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
#2 son: 1980 GS1000G
Family Portrait
Siblings and Spouses
Mom's first ride
Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
(Click on my username in the upper-left corner for e-mail info.)Comment
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