[968crazy]

Brakes squeal on slow stops with light pressure. its so loud I wont drive the car. figured it was the rotors so I replaced the fronts and it still squeals. Anyone know what else it could be?

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[flash]

can you tell if it's the fronts or rears?
what pads are in there?
are the shims installed?

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[968crazy]

<!--quoteo(post=69906:date=Apr 4 2009, 06:58 PM:name=flash)-->QUOTE (flash @ Apr 4 2009, 06:58 PM) <{POST_SNAPBACK}><!--quotec-->can you tell if it's the fronts or rears?
what pads are in there?
are the shims installed?<!--QuoteEnd--><!--QuoteEEnd-->

I think it is the fronts

the pads are OEM style mintex pads

by shims you mean between the pad and piston?

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[flash]

shim - yes

i presume you changed pads when you changed rotors - in case you didn't know, you never want to mix up brake components - they "bake" in together - unless the pad is particularly aggressive, noise is usually due to a bad bedding or deposits on either the pad or the rotor - we used to take the pads to a belt sander before trying to re-use them - if we were on the track, we would take a knife and slice a cross-hatch pattern in them and go bed them again - worked about half the time

i know mintex can be noisy (especially the red box ones) - there is plenty of feedback on those on the web - i know they advertise otherwise, but there sure seem to be a lot of people complaining about them - i'm afraid you may be screwed there

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[ds968]

So after 3 months and about 4K miles on the new brakes ( both rotors and pads ), suddenly they decided to start squealing ..and it's an incredibly loud whistle-like squealing. WTF ?! These are all OE btw, my mech buys them from the local Porsche dealer, so it's not as if I put some after market crap on the car. Anyway, in the last 35 years and multiple cars, each with numerous brake jobs during that time this is THE FIRST time ever, I have had brakes squeal. I also NEVER "break in" brakes after having them installed, and still never had a squeal happen. Now, having said that, in the aforementioned 35 years the same mechanic installed all my breaks and the route I take home every single time might just offer the perfect break in opportunity, albeit inadvertently, LOL. But I did that this time as well, so not sure why after all this time and miles, this nonsense happens. Arrrrgh. What now ?!

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[flash]

limited success, and i've often had to replace the parts, as there is no changing things once the pads and rotors have broken in to each other:



http://www.popularmechanics.com/cars/how...ce/4317748



i have this problem on the SL550 and will be trying a few things in the coming days

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[hot968]

Ad my brake pads to this post they squeal so bad some times I wait to press the brakes

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[ds968]

Ok, what the hell ? I just came back from a short drive ( about 15 minutes ) during which the brakes did not make any noise. Not that I'm complaining , but not sure what to make of this ..is it possible something just got caught up in there yesterday making them squeal that loudly, and then it just went away by itself overnight ?

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[flash]

sure - could have been dust. did you just wash the car?

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[ds968]

[quote name='flash' timestamp='1393203866' post='155461']sure - could have been dust. did you just wash the car?[/quote]



Nope. Did nothing to after I parked it yesterday when it still squealed up to the last moment coming to a full stop in the driveway. And it not rain at night either. I'll see what it does tomorrow during the commute to work - 90% highway , 10% streets . Today it was all streets and lots of stop signs so I'm shocked it did not squeal. considering it was screaming like a banshee ( sorry, very non-PC remark ) for the last 10 minutes of driving yesterday every time I stepped on the brakes with some decent amount of pressure.

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[flash]

mine pretty much stop squeaking once they are warm. the metals expand and stop vibrating.

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[ds968]

there was a lot of heavy fog drizzle on the car this morning and very cool temps outside but the brakes were silent from the start and all the way to work. weird. i suppose it could have been dust or some other particles that got in there which just dissipated on their own overnight on saturday but like i said , i have never heard brakes squeal before so what are the chances in all those years no dust or other stuff ever got into any of my brakes enough to generate squealing ? will see what happens this afternoon - fingers crossed

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[Bulti]

Lol, maybe you hit a piglet, it got stuck and managed to free itself overnight.

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[ds968]

Ok, I'm just going to chalk this one up to a piglet or a gremlin finding their way inside the brakes just that one day and then vanishing overnight. Quiet drive home today also, and I did some very hard braking, soft braking , braking at different speeds and ...nothing.

Of course I am relieved at the thought it may have been just dust or other things that got in there temporarily as opposed to the more common problem after the compounds of the pads and rotors bonded , and to be followed by squealing until I replace the whole set up again, so I'm cautiously optimistic :-)

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[flash]

yeah - i think you need to stop worrying about every little anomaly, and wait until you have a consistent condition. there will be plenty of those, and if you let the transient stuff bug you, you're going to have to seriously increase your alcohol budget.

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[ds968]

Right, as if I need an excuse to increase my alcohol budget, lol .. Hey tomorrow is Tuesday - that definitely calls for a drink ! See ?!

Not used to " transient " stuff, this model must be the only one where things appear, sound or feel as if they're going to be issues which need repair but then disappear on their own and things just return to normal .

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[flash]

roflmao - you should try owning an old british sports car

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