anti squeek on brakes

[madmoomoo]

Hi all,

judging by the amount that came up when i did a search about squeeky brakes, I was quite amazed that so many people have the same funny problems as I do (yeah, random idling and the occasional stall or semi-stall etc).

Here's what was going on:

R33 Gtst

stock brakes

bendix ultimate pads (plenty of grip left)

heaps of squeeking

(making me do some funny braking patterns so as to not make any noise when I'm trying to pull up all tough at the lights... I'm sure many of you know what i'm talking about.... It kinda ruins the cool/mean ass effect if you roll up squeeking like a tram...)

SO: I went to super cheap auto and bought me some of that anti squeek business that you spray onto the back of the brake pads (like pink silly string?!) then 10 mins later put back in place.

WELL: It squeeked again from the moment I drove off a couple of hours later (on the way to the drift battle... those crazy bastards... so entertaining)

It quitened down oh so slightly for the odd ride, but generally keeps sounding like an old vans brakes.

MY QUESTION: (in a very long winded manner)

Backing my brake pads are 2 metal shim thinigs, a darker one that fits snuggly, and a silver metal one that goes about half way down.

With my pink silly string, can I spray in between these metal shimajigies, as to make them grip a bit better together and not rub, hence CUTTING OUT THIS RIDICULOUS SQUEEKING?

I'm hoping this might be ok, since I would keep my silly string away from the brake pot things, but am i doing something which may result in me ending up in a tree?

Cheers,

MR SQUEEKY MOUSE...

(ps. If anyone needs me to translate my dribble (yes, it's 1:40am), pls let me know and i can rephrase my question in one brief question)

[Panikin]

Bendix ultimates seem to sqeal until they are quite hot. Get 'em hot & see if it stops

[Panikin]

you could buy new anti-sqeal plates for the pads from nissan they worked for me until i started using ultimates

[madmoomoo]

Hey, what's all this anti-squeel plates business? Do many people have experience with these? If people have actually used these before, do you guys n gals find them effective? And what's different about them compared to the stockies?

(Actually, do all you other people have the same 2 backing plates that I do?)

If I can find a solution to these loud brakes I'll write something up, coz it seems to be a common thing.... hmm..

[Goon]

Try hard braking from high-ish (eg: 70kmh) speed. this is usually done to "bed in" the brake pads when you first get them to get resin off. However, my dads BMW had the loudest sqeals, he took the car up to speed and braked hard as, but not hard enough to activate the ABS. Problem solved.

[vspec2]

Had the same problem when I put on my EBC pads... got the rotors machined.. problem fixed..

[GTR32]

Madmoo;

If you've read the posts on squeaky f%^king brakes you'll know it can be caused by many things and that the squeal is a harmonic - effectively the brake acts like a bell. In my case retaining DS2500 Ferodo pads and swapping from two to one piece discs solved the problem when nothing else would.

Sorry no experience with Bendix, if they are metal pads then expect some squeal, try some organic stuff - even if you get cheapies from a wrecker to see what happens and this might give you a clue. Don't whatever you do spray the stringy stuff on anything other than the pad backing plate.

You didn't mention the history of this - has it just started, did it coincide with a pad change etc?

Regards

[madmoomoo]

The squeeking started not long after the bendix pads were installed (ultimates). I don't know if the workshop bedded the brakes in or not...

If the discs were machined, would that mean it's kinda like doing things again, and getting to bed the brakes again, to make it match up to the discs?

Back to another part of my question before... do any of you guys know if you have 2 metal shim/plate things behind your disc pads?

The closest one of mine to the pad is dark metal, and the same size as the pad, the other is a shiny metal (steel?) that only covers the top 1/2 or 2/3 or the pad. If you can't quite get the picture of this, when you see the imprint from the disc pot things (whatever they're called, that press the pads... the big round things), the circle shape doesn't quite fit on the shiny metal part, and the rests overlaps onto the darker metal...

My other question that i just thought of is this... when people say "anti squeel shims/pads/something", are they referrring to the backing plate thing behind the brake pad, or the actual brake rotor/disc thinig..?

Thanks for your input....

= }

[madmoomoo]

Oh yeah... GTR32, I have done some reading up on all this squeeky business, and I remember reading about the harmonics and frequencies etc... Any idea what exactly is vibrating? is it the disc, or something in the pad/backing/calliper assembly?

Also, don't worry, i just sprayed my silly string on the back of the pad.....

Actually, that's why i'm wondering about which bit is vibrating etc, coz if it's these plates behind brake pads, then would a tiny amount of silly sting in between help to stop the metal on metal rubbing?

Or maybe that would just make everything stick together and decide not to work, and i'd end up in a pond somewhere....? hmm..

[GTR32]

Moo;

the harmonics are in the disc. best way to describe it is to imagine the disc is like a bell. the interference between the pad and the disc sets up a frequency in the disc that we hear as a squeal.

the two plates on the rear of the pad are anti squeal shims designed to damper the harmonics. sometimes they aren't enough.

if you have a combination that is going to squeal, sometimes no amount of machining/bedding will fix it, as i discovered.

sounds to me that the pads are the culprit if the squealing started after fitting them. you might try chamfering the leading and trailing edges of the pad, that sometimes helps. Or as I suggested just get some alternative pads from somewheer and try them to see if you can isolate the problem.

[Zahos]

if you stick the 2 shims together they will squeel.....

Fist time I installed ultimates, I stuck the 2 together with the anti squeel brake glue, and they squeeled like a mother ****er.

Then I took them out, peeled all that glue off and glued one shim to the brake pad, and put some on the outside of the smaller shim so it sticks to the pistons.

So the only part where ther WASN'T any glue was between the 2 shims.

Now I am on my 3rd pair of ultimates (as of yesterday) and there has been NO SQUEEL since......

Give that a try...

Also make sure you bed them in properly. I just did 5 really hard stops from 50 km/h, and that was enough...