CRC Disc Brake Quiet-Squeaking Brakes

[Night Rider]

Looks like there are more than a few of us that have squeaky brakes on our GTI and R. I read somewhere in this forum that the discs cannot be machined but certain brakes shops seem to suggest that they can. Can they or cant they be machined?

I read that there is a product called CRC Disc Brake Quiet that can be sprayed on to get rid of the sound. Has anyone tried this product before and how was it?

Feedback much appreciated.

[brad]

Maybe ask a mod to move this to a more appropriate sub-forum?

You haven't actually said how many km you've done, what model, etc so I can only guess at the right answer for you.

You can machine them if there's enough meat but on a 25mm rotor you've only got 3mm to play with.

Squealing is usually caused by a dry harmonic. Sometimes it's the pad material - cheap aftermarket stuff or expensive track oriented pads tend to squeal - if they aren't at the right temp.

More often than not, on slightly older cars on their 2nd / 3rd set of pads it will be poor preparation (dirt, and lack of lubricant in the right spots) & poor assembly technique (including not torquing the bolts evenly) with a possibility the rubber bushes on the sliders have gone oval / soft.

Anti-squeal compounds do work but you still have to dismantle the brakes & get the basics right (clean, prep, lubricate, etc)

[Lucas_R]

I had the disks on my Mk6 GTI machined when i changed brake pads. Because the car was manual and not used in a heavy traffic situation, the wear on the disks after 55,000km was pretty minimal. The disks machined up just fine, and i gave the calipers a real good clean to remove all the brake dust from the stock pads. I threw the new pads in, and now, 17,000km later - no noises what so ever from the brakes (and less brake dust).

[Night Rider]

Sorry, mine is a Mark 6 Golf R, clocked 31,000km. Discs have 50% left but is glazed. If it cant be machined, I will just have o tolerate it for a while before changing.

I was browsing the net to see what new discs I can get but they apparently come in two sizes and I do not know the actual size for mine. I am using the same one that came with the car when new. Can anyone tell me the size f he original discs?

Thanks and sorry I did not mention the model in the post earlier.

[brad]

The fronts should be 345mm

Brakes Direct will have something (DBA or their house brand).

Have you tried blasting all the dust out of them with a strong hose or pressure washer?

Also, doing several heavy stops from 100kph down to 40kph then drive it for 10mins for them to cool.

If they are glazed, pull the wheel off & rough them up with some heavy wet & dry.

[Lucas_R]

Sorry, mine is a Mark 6 Golf R, clocked 31,000km. Discs have 50% left but is glazed. If it cant be machined, I will just have o tolerate it for a while before changing.

I was browsing the net to see what new discs I can get but they apparently come in two sizes and I do not know the actual size for mine. I am using the same one that came with the car when new. Can anyone tell me the size f he original discs?

Thanks and sorry I did not mention the model in the post earlier.

I assume you have the stock brake pads fitted too. These absolutely chew up the disks which is why you have worn them 50% in on 30,000km. And no doubt you notice how much brake dust the pads throw off - the dust itself can cause the brakes to squeak. As brad mentions above, give the calipers a real good clean (even at Carlovers with the high pressure hose will help) and this might help stop/reduce the noise.

[Night Rider]

I noticed all the undesired sound disappears after driving in a heavy downpour. I guess it is the free washing.

Yes, they are the stock pads and rotors and yes, Brakes Direct is where I will be getting my new pads and rotors. Not only is the sound annoying, it is embarrassing.

Thanks for all your feedback. All noted and acted upon.

Cheers