944 - Squealy brakes

[Alan26]

Back on the road with my 944S2, but the brake noise is horrid! When they are warm, slowing & stop start in traffic, they squeal dreadfully. Discs & pads were replaced a few '000 miles ago with original spec items. Been advised it's the newer pad materiel (no asbestos), but I don't hear other cars (older or classics), making similar noises. Also, when braking harder than normal, they make a "grinding noise", but discs and pads are all in sound condition. Getting new Mintex pads tomorrow, and also found it didn't have the "anti-rattle" shims stuck to the pads. Got a set of those too now, but is there anything else I need to check or change?

[pcn1]

I noticed mine starting to sqweek a bit when warm. My anti-sqweek shins long since rusted away but pads have loads left in them. Try taking out the pads and give the calipers a good clean, then aply some copper-slip to the edge of the pad metal backing (not on the pad face !!!) This can help.
I might have plate lift problems on my rear calipers so when it stops raining I need to look at those !

[Alan26]

My brakes squeal so much, it's embarrassing, especially with pedestrians nearby. Front calipers are clean, and tried copper-slip too.
What / where are the lift plates on the rears? Don't think the noise is generated from there, but will check them too this week-end.
Any other ideas anyone??

Al

[pcn1]

I have not removed the plates yet, but I understand they are the metal stips that are fixed to the inside of the caliper (top and bottom) where the edge of the pad slids against.
When they get old they can corrode and "lift" causing the pads to stick.

Another trick I heard off was to file a small 45 degree lip on the leading and trailing edge of the pad.

Let me know if you find the cause !

[DSM2]

The 45 degree chamfer often works. The squealing comes from vibration set up at the leading edge of the pad as it lightly touches the disc. If the pad is square this will always be a sharp edge. Putting a lead on the pad removes the sharp edge and cause of vibration.

[nos4a2]

Does that work with EBC Red Stuff pads too - mine squeal like a pig!

[Alan26]

Changed the front pads this morning - the box has "Apec braking" printed on it, ref PAD 660. Also fitted the "damping pads" - (part nos. 964 351 096 01 & 02), which were not previously fitted. They are a fiddle to assemble - the bottom smaller sized ones don't grip into the piston face. A short journey later and no squeals - ohh heaven!!
Pads might be "softer" than the Pagid pads taken out, but I'm not tracking it so I'll wait and see how they bed-in. If I get bored one day, I might re-fit the Padgit pads with the "damping pads", and see if that was the cause of the problem. Thanks to all who responded - hope this helps!
Cheers, Al.

[Crimp a Length]

Interesting......
every 911 i have had has suffered with bloody squeaky bloody brakes when warm.
In the end i have just got used to it and forgoton about it, as long as they stop me!!