W113 Pagoda SL Group > Drive train, fuel, suspension, steering & brakes
Constant brake squeal driving me INSANE!!! :-)
Ulf:
Sometimes it's the little things that drives you mad, so recently I had my car in to fix a few annoying sounds - a squealing fan belt and a front brake that would begin to squeal semi-constantly when getting hot (sounding like a very large grasshopper/cricket), but disappear for a few seconds after tapping the brake pedal. My mechanic found out that the master cylinder only pressurised the front brakes (my car is a 1964 230 SL with discs up front and drums rear), so he replaced that and also changed the brake hoses for the rear brakes. But the sound is still there, only now it seems to have moved from the front to the rear and gotten more constant and even louder (people stare and NOT in the good "oh-look-what-a-lovely-old-car-way") and the sound will no longer disappear after tapping the brake pedal. Also the pedal-feel seems quite a bit softer. He claims to have done everything by the book and bled the brakes thoroughly. I could just send it back to him and just demand that he gets it right, but the reason I'm asking you is to give him a few pointers as I don't want him to spend hours/days barking up the wrong tree :-)
Br
Ulf
PS: All pads were recently replaced
wayne R:
ULf, A couple of things you can do,there is a anti squeal lube that comes in small plastic tube, this is applied to
the backs of the front disc pads before fitting , strange most brake workshops dont use it because most modern pads
have a thick black anti squel on back already.Also its sticky and probably can not be bothered to use it,----but it works great.
Also especially with front pads new as well, most modern ones come with the leading edge has a approx 1/4 inch chamfer
or bevel, but alot of older classics like our SL do not have this chamfer on pads, so its very easy to do with a File placed carful in
a vise, just bevel it ,i do all around,about 1/8 inch. See photo of my front i just did month ago,sorry pads are in,But showing the
Anti squeal lube from a Porsche about a year ago.Also rear linings can
squeal on edges of linings against backing plate as breaks are applied ,so a little anti squeal can be applied.
450sl:
MB ,seems to think the position of the pistons is important...see attachment ;there is a small cutout that has to be positioned right.
Mark
Ulf:
Thanks, I'll definitely try that, but the brakes are not squealing when braking - actually that's the only time they are silent. It's more of a constant whine when driving and only after the car gets hot and after braking a few times. And now the sound has moved back to the to the left front brake again...weird :-/
U
Cees Klumper:
Could it have something to do with the brake proportioning valve (if the 230 sl has one)?
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