Yes Another Brake Squealing Thread

[Sydneykid]

so you mean the top and bottom of the pad when they are sitting in the caliper has some play and wear out the caliper?

Yep, there has to be some room for differential expansion of the pad and calliper. But too much and they vibrate.

Cheers

Gary

[Onthehunt]

the squeel went away all the time for me but recently has come back maybe 5% of the time so has made a huge difference.

[tek_01]

good idea gary, would explain everything as i have tried many combinations of pads/rotors/glues and still have the same noise

still not 100% on how im going to fix it tho... so you actually welded onto the backplate of the pad thereby making it saw 1 or 2mm longer?

maybe i could use some silicone or rubber there to stop it? dont have a welder to try your method

[tek_01]

just installed the rear qfm brake pads, took them for a bed in session

f**k me they squealed so hard like a blood curdling screech!!!!!! like the usual noise but amplified 1000times lol

will wait til they cool down and see how they go however its not a good start

[GTshortie]

just installed the rear qfm brake pads, took them for a bed in session

f**k me they squealed so hard like a blood curdling screech!!!!!! like the usual noise but amplified 1000times lol

will wait til they cool down and see how they go however its not a good start

Is that the HP-X or A1RM QFM Brake pads?

Also is that with RDA or standard rotors?

Screeching louder then when you had the Bendix Ultimates on?

[tek_01]

Is that the HP-X or A1RM QFM Brake pads?

Also is that with RDA or standard rotors?

Screeching louder then when you had the Bendix Ultimates on?

It is with the 500deg ones on both front and rear now

they are the group buy slotted rotors so not exactly sure if rda or dba

yes i must say it has gone worse now (had cheapie brake pads on before not ultimates). I must try the stick on shims

im so over this squealing crap. I dont want to go to any brake place and ask them to fix coz i know they will say "machine rotors first" so theres about 100 bucks front and rear at a guess and i know this isnt the problem. Unless someone knows a place that will not dick me around

[tek_01]

picked up some shims today to try pity they only had 1 set so i cant do the rears but will keep you updated

the shop rekons its coz i got qfm pads on... hmm i sense a trend happening

every shop rekons its the brake pads... ive gone through 3 different names and still the same so i rekon they are full of shit!

[tek_01]

well took all pads out, roughed them up so they arent glazed

put adhesive shims on the front

hey guess what

they still squeal

going to get the rears to make sure its not just the rears squealing. too hard to bloody tell which ones it is

[tek_01]

Does it real bad when going downhill like in a car park or the like

so im guessing on a downhill it would use the front brakes even more correct?

if thats true there goes my theory of its the back brakes

[tek_01]

Question: what way do the slots go on the rotors just out of curiosity

when the wheel spins do the slots lean into the calipers or away from the calipers if you know what i mean

[HotPlates]

^^^ You must have tried nearly everything under the sun by now! lol I've got the same problem, but my squealing is amplified when the rotors are wet after it's been raining. But this is where it gets weird.... after I wash my car, I pressure hose the rotors through the wheels. I do this because I think the brake dust may be contributing to the squealing. This HAS helped somewhat and I get squealing probably only 40% of the time now. It doesn't always squeal either which has baffled me. Again like you, the squealing is only when coming to a stop.

Try running your finger over the rotor or around the inside spoke of your mags and see if you get a lot of brake dust. I also understand this was not an issue much with cars before they had to stop manufacturing asbestos brake pads. I could be wrong though.

I mostly get squealing first thing in the morning, and at the occasional traffic light. But after that it's pretty good. I definately get less squealing in the summer though I have noticed.

[tek_01]

for me, the more heat the worse it seems

first 3 or 4 stops there is no sound but than it gets constant after that

will try greasin the pins but prob wont do nothing

[HotPlates]

do you have a lot of brake dust though?

[tek_01]

not really no, rotors are smooth to touch and no dust or very little to be seen

[MrStabby]

This probably isnt going to help much but i was told that the squealing is caused by the piston to shim/brake pad surface. Before i ran my caliper upgrade, i was using the following and had no squeal with DS2500s

Piston -> red rubber goo -> shim1 -> nissan pad grease (still there, just re-spread it out) -> shim2 -> pad

IIRC the goo needs to be left for 10mins. Maybe if you dont let it dry a bit you just push it all out when you first apply the brake. Is the grease you got especially for brake shims or is it just regular copper grease?

PM me if you want to come to Syd inner west to let me have a look. I'm no expert but a new set of eyes may help.

[tek_01]

thanks mate im a bit busy coz of xmas period but may take u up on that later

ive tried all combinations of goo with no success

[tek_01]

well omfg i may have fixed it

well anyway we will see how it goes in a weeks time

used grease on the pins and retainling clip where pin makes contact and in between shims. Also used the rubber anti squeal shims on the back of the brake pad and no squeal!

went for a 45 min drive and only had 1 real minor squeal out of the whole drive

maybe my joy will be short-lived but f**k does it sound good when theres no squeal

[nuffsaid]

Hey tek!

Fantastic that you have finally resolved it. I also used the red goo and maybe for 2 months the noise was gone, loved it.

It is bad now though, after about 10 mins of driving, any soft application of the brakes coming to a stop (once in a while) it will screech like crazy.

Did you grease the two pins that align the pads correctly? just run grease up and down them?

And then grease the retaining clips, which ones are these? I am guessing those wire type clips, if so which part of them?

Finally, I take it from above that you also tried rubber goo on the back of the shim so the set up is like this:

piston --> GOO --> shim1 --> GOO --> shim2 --> GOO --> back of pad

[tek_01]

just in surfers atm so havent had a chance to check thread.

Basicaly what i have now is

brake pad -> rubber shim -> metal shim1 ->grease inbetween->metal shim2

note, NO goo was used with this setup as it says not to use with the rubber shims

i grease the 2 pins and the clips that holds the brake pads in where it makes contact with the pins. NOT the springy metal bit that goes through the end of the pins as that is the safety mechanism and dont want that sliding out lol

i used wheel bearing grease but now there is a real light squeal after driving to QLD but not bad at all and if it stays like this i will be happy. will try with proper copper grease when i get my hands on some and hopefully it keeps longer

[Onthehunt]

^^ how is your squeeling going? i am getting squeeling sometimes, it's becoming just as bad as it was. I was thinking of trying what you did with the two pins but wanted to see how it is now and if it had come back for you?

also what grease do you think would be best to use?

any help would be great as you know my pain lol

just attached a pic so you can point out what you greased and exactly which parts if that's cool.

cheers

Edited January 29, 2008 by Onthehunt