Brake scraping noise

[Endorphin]

Upon returning from the mid North Coast this week it would appear that the Paj has developed a scraping / screeching noise coming from the rear passenger wheel. So I decided to take a closer look and determined after taking the brake caliper off that it was most likely the pads that were causing the problem.

After taking the pads out, giving them a clean up and then reassembling it the noise still remained. Now that pads were about 50% worn and no metal was touching the disc. Knowing that pads can start to become problematic with noise with age etc I decided to replace them with a set of Bendix 4WD pads. It appeared the problem was fixed. Seemingly pleased with myself I went and rewarded myself with a couple of frosty beverages.

The next day we went down the South Coast only to hear it return! It would appear that a very light application of the brake and the noise goes away (whilst the brake was being applied at least). I started thinking could it be the park brake shoes that are rubbing... Several hard applications of the park brake whilst moving didn't seem to have any effect. Although the sound did go away again briefly whilst the brake was applied.

Could it be the piston causing the pads to catch or could it be the disc? Any suggestions / ideas?

[Matatak]

is the noise there by just spinning the wheel while up on a jack?

make sure the Backing plate hasnt been bent slightly onto the disc.

[Endorphin]

Yes the noise is there when I spin the wheel whilst up on the jack and the backing plate is not touching the disc either...

[marcthelegend]

Gday, have you checked that all the caliper bolts move freely and are not seized.

I had the same problem and put HTB grease on the bolts and the noise stopped, with the seized bolt, the caliper will drag on only one side and screech.

This is where I would start.

Cheers

Marc

[Endorphin]

Thanks Marc. I'll give it a shot.

[dank54]

While your checking the caliper slides like Marc mentioned you might as well check the wheel bearing for movement which could cause the same kind of fault?

I had the joy of owning a BF falcon previously which had dragging handbrake shoeswhich is another possibility. You have to set them up 100% otherwise they will drag, knock, not hold or squeak.

[Ross W]

Just a comment on the suggestion of applying HTB grease to the caliper bolts - my understanding is that the recommended grease for caliper bolts is a high temp silicone grease such as Molykote 44 medium, rather than the more common clay or lithium based wheel bearing greases.

Ross

[Endorphin]

Thanks for the suggestions guys. I have fully cleaned the area with brake cleaner and a wire brush whilst trying not to inhale the dust etc. I then applied high temp bearing grease to the caliper bolts. Followed by a light application of emery paper to the disc and lastly I used some of that brake quiet paste to the back of the pads.

Figures crossed that I've silenced it for a while!

Thanks again for the suggestions.

Mike

[ngwagon]

how did you go? fix it? I had a noise like that when i was out and about a few weeks ago and turned out to be a stone had wedged in the caliper and cos my disks are warped the screeched at highr speeds, only found it cos i jacked her up and spun the wheel slow and pulled it apart and got it out..

[Endorphin]

Hi ngwagon,

Yes it appears to be fixed (he's says with figures crossed!).

[LOVE MY NM PAJERO]

A simple thing to check and easily overlooked, does the inner pad have a little metal telltale letting you know the pads need replacing soon. It looks like a handle to help you remove the pad. It breaks away easy enough. Noise disappeared for me.