whats the squeel mean again

[dumbskate]

i had a mechanic friend(means nothing) of mine put new pads on all round a few weeks back and for the most part ive had this problem.

pretty much when ever i stop i get the high pitched noise that usually comes with worn out pads(but these are new) ive noticed though that it will only do it below 30 mph and not in reverse.

now im trying to remember something i heard once about seatng the pads right , could they be on backwards ???

anyway fill me in chaps

[corsair]

or I think they haven't been seated or set or something like that

I think you need to do some kinda hard stops on an open space of road from like 60-0 and some from 40-0.

But I'd recommend getting a few other more technically adapt opinions first.

[BAC5.2]

Could be vibration, could be improperly seated pads, it could just be shitty pads in general.

Do a few hard stops from 60 down to 5mph, and then let the car sit for half an hour and see how they feel and sound after that.

[Subaru_Nation555]

Maybe spray the rotors down with some brake cleaner. Some contaminates might have gotten on the braking surface.

[LaureltheQueen]

for the first 100 miles you're not supposed to stop with your brakes engaged. can result in uneven bedding of the pads

[Legacy777]

for the first 100 miles you're not supposed to stop with your brakes engaged.

Just curious....how are going to stop then???

[professor]

the noise is from the pad backings vibrating against the piston. It usually happens when missing shims or corroded shims are re-fitted. Even with new shims I do the following:

coat the entire back of all pads liberally with blue Permatex anti-squeal BEFORE you even start the brake job. It is a gooey stuff that becomes a rubber coating when it dries. By the time you are ready to put the pads in place, they will be dried and ready.

I always do this and NEVER have a problem with this type of squeal. Do all the bedding in (which I ignore) and spraying you want but the permatex will solve your problem

also if the shims are in any way corroded thrwo them away, they are not really needed. if you use them, coat the shims front and back and apply to pads when the permatex is still wet.

[LaureltheQueen]

you slow down to an almost stop, and let off your brakes slowly, with the tranny in neutral. If you stop on a hill or something, just engage the ebrake until you get a green again.


and you should ALWAYS bed in brake pads. The car won't stop as well if you dont.

[Kelly]

I always reuse the shims. (if by shims you mean the thin smooth covers that go an the back of the pads)

There purpose is that the back of the pad is cast and its surface is uneaven. The "shim" allows for a bit of pad movement, without the pistons gouging a groove in the pad backing. Not only will not using them transfer more heat to your brake fluid, but it will transfer more vibration, thus squeeling.

People often change their pads, and dont realize that the "shim", or backing plate, is reusable and should be. I actually stock them new.

If you got crappy pads try the disk brake lube, it works well too, but shouldnt be neccissary to keep brakes on our cars from squeeling.

[LaureltheQueen]

i was under the understanding that disc brake lube was for the pins on the calipers

[dzx]

I always reuse the shims with some silicone on them.