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Old 05-20-2003, 00:08   #1 (permalink)
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what causes new brake pads to squeal?

Hi,

Just got some new brake pads fitted and now they are starting to squeal..

IS there a way to stop this anti-social behaviour?
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Old 05-20-2003, 00:10   #2 (permalink)
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Ground them and send them to their rooms without dinner. If that doesn't work, a stiff caning should sort them out! :s3
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Old 05-20-2003, 07:10   #3 (permalink)
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All brakes make a noise; it's just usually at a frequency that the human ear can't hear (think about it; what would you expect placing any material againsta fast spinning steel disk). That said, the ability to hear the brakes is usually caused by the pads vibrating although brake pad dust and rough disk can also be contibutors)

Ways to fix it are:

a) Use CRC Stop Squeal (pink adhesive goo) available from Repco and most autopart places. This rubbery adhesive goes on the back of the pad and in 95% of cases stop the audible squeal. I use it all the time ofn all 3 of my cars.

b) If this doesn't work you can cut a radial groove (same direction as if you had spokes in the wheel) in the pad with a hacksaw in the middle of the pad. Cut down to within about 1 or 2mm of the backing plate. Some good pads already have a radial groove or cut in the middle of the pad for this reason.

c) Chamfer the leading edge of the pads (the short side) so the angle of incidence with disk is around 45 degrees. Just grind or cut the corner off the leading edges (just about 5 mm usually).

These will not inhibit the performance of your brakes and are standard Porche approved remedies.
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Old 05-20-2003, 09:42   #4 (permalink)
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What kind of pads? on what car? front or rear? left or right? sorry about the questions but more info might get you a better answer/result.
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Old 05-20-2003, 17:00   #5 (permalink)
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Exactely Red-i, were the rotors machined ?
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