How much squealing is acceptable?

[granville]

My beetle uses Performance Friction pads which are supposed to be good but I'm unconvinced they're better than the Pagid pads I used previously.

Feel free to comment on that but the main thing I'd appreciate are others' experiences with brake noise.

Honestly, mine are f@cking appalling, truly antisocial, indeed, I'd go so far as to say embarassing.

This is my second set of PFs and strangely, when first fitted they seemed fine, even after a good razz.

It was only after a Brunters session that the squeal re-emerged and yet Martin's (banana) car is and remains, so I trust, ok. It's a real sod.

Any suggestions?


Nordic Grunt.

[pdV6]

Is the squeal from the pad/disc interface, or some other part of the mechanism vibrating?

[clubsport]

These type of pads will make a lot of noise anyhow, especially when they do not get to working temperature. ...do you have them resting on the caliper pistons or are they located with the "anti squal pads"....there are four per caliper, sit in the piston,,stick on the back of the brake pad,,,approx £8 a side.....these can help quiten things down, but obviously the compound used is the main culprit.

[SimonHarrod911]

My 911 turbo has Porterfield pads on it, and the brakes are terrific, however they squeal like a pig when cold. It's embarrassing like you wouldn't believe. I asked Phillip Woolley's (www.911sport.co.uk) advice about what to do because everyone stares. His advice:

"Wave at them."

[Thom]

derestrictor said:

Feel free to comment on that but the main thing I'd appreciate are others' experiences with brake noise.

Have you had the possibility to notice differences between with and without the use of anti-squeal shims (the round ones held on each piston, not those of the pads) ?
Curiously the brakes on my car have been squealing much less, if not to say no more, since I threw anti-squeal shims away ... I used to work at a place where they used silicon grease to fix squeals, but that was on anemic single piston Euroboxes brakes.

[granville]

Thanks chaps,

PDV - it's 100% the compound as the venerable clubsport suggests.

Paul - although when up to temp there is some improvement, heavy braking is still horrendous.

I can't understand why these pads were ok with both cold and warm use following fittment, even after a hard run but only following the rigours of VMax VI did the problem reappear to the previous, shrill extent.

Simon - I think the advice you received may be the unavoidable reaction to this issue!

Thom/Paul - daft as it sounds, I can't recall whether or not the car has those anti-squeal things, I'll get it checked and report back.

To be honest, I'm beginning to think a return to the Pagids is my best bet, even if it compromises braking fractionally (not that I ever noticed): I only ever remember thinking how improved the braking was from standard to Pagid upgrades at that time.

Ultimately, the 6-pot system on Adam's RUF (the Turbo-R) is where I want to go: the stopping power from very high speed was not just more forceful than mine by some margin (and mine ain't goo!) but comfortably more proggressive.

Argh!

Thom - never tried the

[Thom]

... silicon grease ?
Never mind - it might have worked on some poverty-spec floating brake calipers I have come across but that is not a solution I'd be willing to use on a decently-sized Porsche fixed-caliper anyway. Better have any brake-related issue properly identified and fixed instead of trying some old farts' empirical solutions, IMO.

>> Edited by Thom on Friday 21st January 10:51

[MOD500]

Yes, the standard set up on mine doesn't make any noise, they only squeak and moan after many repeated laps of Brunters....along with slight smoking too when the pads were new. The brake pedal started to go mushy after 8-10 continuous laps with the standard brake fluid in too; though I had superblue (sp?) put in at the last service and the feel and fade resistance improved a lot.

I can ask for opinions on Rennlist if you want DeR.

Thanks


Martyn.

[BliarOut]

Have you tried Copaslip on the back of the pads? It used to do the trick on my bikes when they suffered with this.