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[SMD]

Fitted new discs and pads around a month ago and gentle the first 150 miles and then started normal braking. Noticed they are squealing today and am a bit pissed off by this because they are GM discs and pads.

Can something be done to make it go away ?

[noel]

did you put a small amount of grease on backplate of pads
this sometimes help IMO.

[SMD]

Yes. This was done at the time of fitting. Would it be worth doing again?

[noel]

possibly i use copper slip if thats any help 

[dazzerM]

possibly i use copper slip if thats any help 

I agree copper slip to the backs of the pads - Not the friction part, squealing is usualy the metal on the rear of the pad causing friction against the caliper so this should solve it

[Stallion]

Even after a 2nd application of copper slip, and still the squel doesnt go then assume that the compound on the pad is damaged and get them returned and replaced! 

[Bionic]

You should also try looking at the backplate because sometimes the backplate can get slightly warped when changing the pads which then contacts the disk as you drive and so squeals. The braking slightly distorts the disk too because every component that moves has some play in it.
Coppaslip should resolve the problem if it is not the backplate.
Did you also change the disk pad retaining clips too?
Many don't and it is not recommended by the manufacturers. For a few quid its easier then having to redo the job. 

[SMD]

Even after a 2nd application of copper slip, and still the squel doesnt go then assume that the compound on the pad is damaged and get them returned and replaced! 

Thanks for all the comments. Will try copperslip first and maybe chamfer the pads a bit more.

Stallion. Surely I will get told to do one if I try to return the pads. I bought them over a month ago and even then they will try to blame it on the installation.

[Stallion]

Even after a 2nd application of copper slip, and still the squel doesnt go then assume that the compound on the pad is damaged and get them returned and replaced! 

Thanks for all the comments. Will try copperslip first and maybe chamfer the pads a bit more.

Stallion. Surely I will get told to do one if I try to return the pads. I bought them over a month ago and even then they will try to blame it on the installation.

Know what you mean, as always! 

[amba]

Had same problems here with last 2 sets of GM pads.Despite copperslip and carefull install they squeal when they get hot.

I find that they create a lot of brake dust so in these dry conditions give the disc area a quick blast with some break cleaner every couple of days then rinse with hose pipe.

I think its the extra dust they create..and possibly heavy brake application being an auto.

[Andy B]

The only way I found to cure my front (TC) pads from squealing was to replace them with a new set. They've been squeak free now for the past 2/3000 miles. 

[feeutfo]

The only way I found to cure my front (TC) pads from squealing was to replace them with a new set. They've been squeak free now for the past 2/3000 miles. 

Iirc,as only two of the pads have shims, there was talk of adding the used shims from the old pads onto the non shimmed pads on the new set, due to an initial squeal from new...?

(the idea being having four pads with shims, the mat black pad thingy stuck on with double sided tape )

[feeutfo]

Re chamfering, I find the tc pads I've seen already have hhhhyowwwg shammers on already.... No? :-?

[Andy B]

The only way I found to cure my front (TC) pads from squealing was to replace them with a new set. They've been squeak free now for the past 2/3000 miles. 

Iirc,as only two of the pads have shims, there was talk of adding the used shims from the old pads onto the non shimmed pads on the new set, due to an initial squeal from new...?

(the idea being having four pads with shims, the mat black pad thingy stuck on with double sided tape )

That rings a distant bell ..............  :-/ but TC pads just have the soft backing on 2 pads don't they  :-/ :-/ :-/

[feeutfo]

The only way I found to cure my front (TC) pads from squealing was to replace them with a new set. They've been squeak free now for the past 2/3000 miles. 

Iirc,as only two of the pads have shims, there was talk of adding the used shims from the old pads onto the non shimmed pads on the new set, due to an initial squeal from new...?

(the idea being having four pads with shims, the mat black pad thingy stuck on with double sided tape )

That rings a distant bell ..............  :-/ but TC pads just have the soft backing on 2 pads don't they  :-/ :-/ :-/

Yes, so take the backing of the old ones, apply to new ones, making four pads with shims...

Shims, being soft, take the resonance out of the pad to caliper. Usually a soft metal. Although in this case being cheap pads, are a springy tin material with a rubbery type coating of some sort....?

So you didn't stick the old shims on the new unshimmed pads...? By the sound of it..?