Yeah just got new brakes on my 2003 BMW 325i and a couple days later i have noticed a severe squeaking when the breaks are warmed up. is this normal for new breaks that havent been warn in yet?
2007-03-09 19:14:55 · 6 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
Have someone pull the pads and put anti-squeak compound on the inside of the pads. Try the shop where you got the brake work done, they ought to do it free, as they should have thought of it from the start.
2007-03-09 20:21:11 · answer #1 · answered by 1000 Man Embassy 5 · 0⤊ 0⤋
It takes three conditions to make that squeaking (1) a severe vibration source, (2) a pair of touching hard metal surfaces, and (3) a resonance condition: that is the constructive transfer of vibration to noise energy by having the vibration kick of the current vibration cycle add to, instead of cancel, the ringing effects of the kicks of previous cycles.
To cure the problem you need to get rid of at least one of the three:
No. (1) is likely due to either at least one of your break discs not properly re-surfaced so that its thickness is not uniform around, or the mounting of at least one of the discs on its flange was not proper so it dances sideways a bit when it turns.
No (2) is likely a lack of sim (a soft metal acting like a cushion between the back of a break pad and the hydraulic clamping jaw.) Spraying a polymer oil on the joint may stop the squeaking, but only for some short time.
No. (3) may happen only at certain car moving speed or certain pad temperature. Going slower or faster, or having the pads and the jaws cooler or hotter, causes either the forcing vibration frequency or the response natural frequency to shift. And, when the two don't sync, resonance does not occur and the break produces no severe loud noise.
2007-03-09 21:20:37 · answer #2 · answered by sciquest 4 · 0⤊ 0⤋
if the pads are metallic or semi-metallic, they will actually contain some metal in the padding and will squeak a little. Also, after the car sits a while in certain temperatures...the surface of the discs can build up a small amount of rust and will need a few good stops to clean it off. but i would expect a quiet ride from a 3 series.
2007-03-09 20:48:47 · answer #3 · answered by piecies_81 3 · 0⤊ 0⤋
Try tightening the brakes up or maybe is they feel to tight, loosen them up.
If you took it to a shop take it back and tell them that your breaks are squeaky.
If you did it yourself then go back to it and make sure there properly installed.
2007-03-09 19:26:56 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Did the shop apply some anti-squeal compound to the pads?
2007-03-09 19:18:31 · answer #5 · answered by Honda Ryan 2 · 0⤊ 0⤋
First, you probably had semi-metallic pads installed. If you did not ask for the shims to be installed, then they did not install them. The shims quiet your brakes alot.
2007-03-09 19:51:59 · answer #6 · answered by sellandtrade 4 · 0⤊ 0⤋