Noise from brakes without braking

[dylan8]

Having some noise coming from my brakes when rolling at slow speeds with my foot off the brake.
Sounds like pad and disk touching, can even hear the minor warp I have in one disk.
Once they get a bit of heat into them I seems to stop. not sure why its only during the start of the drive, takes 3or so lots of braking before going away
My thoughts are piston failing and not allowing the pad to retract...?

These are the original pads and disks with 240k km on them, no lips. still decent amount of meat on both.
Can't work out if its front or rear or both

[2000MN]

Not dirt or debrea stuck in it Dyl?

You could also apply some of that brake squeal grease and see if that helps?

[JustCruisn]

Clean and lube the caliper pins so the calipers can retract more easily.
240K on original brakes is just nuts, i'm at 198K and I've replaced front and back twice now.

[dylan8]

Not dirt or debrea stuck in it Dyl?

You could also apply some of that brake squeal grease and see if that helps?

Had dirt suggest to me also, not sure.

Clean and lube the caliper pins so the calipers can retract more easily.
240K on original brakes is just nuts, i'm at 198K and I've replaced front and back twice now.

Ill investigate cleaning them,
Yeah not bad, I'm only replacing the fronts to go bigger for aesthetics haha.

Think its the rear, I do recall my old alignment guy saying the shims I run in the rear put the pads on a slight angle to the disk, so I'm assuming this would make them even closer at one point of contact and probably not helping the cause.

[brad]

The slider pins & machined sections of the carrier will be dirted-up. It's also very likely that the slider rubbers might be worn but you can attend to that later.

You'll get the best result if you pull it to bits. This isn't quite in order but you''ll get the drift.
Basically, you need to remove the caliper from the caliper carrier. The pins need to be taken out of the rubber bushes & clean them up with steel wool or a scourer pad or a brass brush.

Remove the pads, Remove the caliper carrier, remove the disc rotor. Use a gerni or just a really hard hose & blast the daylights out of all those parts & the dust shield. You can even suds them up & agitate with a brush.

Wire brush the machined channels where the pads sit in the carrier.

The rotors are probably lipped (even if you don't think they are) - either replace, get them machined or file/grind the lip off if you feel competent to do so. Or leave it alone if not.

re-assemble:
Apply the thinnest smear (I'm talking about the same as chapp stick on your lips) of lubricant to the machined surfaces where the caliper carrier contacts the pads. I don't worry too much what I use - Koppr-Kote, HTbearing grease, black moly grease all work for me.
Apply a really thin smear of lubricant to the surfaces of the pad that contact the caliper carrier & the caliper. Again, less is more.

Lubricate the pins & the inner part of the rubber bush.

If you feel inclined rubber bush replacements are available. If you wish to upgrade slightly TyrolSport do a brass replacement.

I'm also researching a cheaper alternative to the TyrolSport brass bush but that's probably a fair way down the track

[grtuned]

Check if you got the spring release system on the rear if it's from the rear
check out grames86 web space page for info!!

[dylan8]

So checked out the brakes quickly while dealing wheels, only a minor lip (like .3mm, hardly even catch a nail on it) but there is some nice grooves running around the disk in the centre of the face where it has been making contact.
Doing some more reading on the net it could be hand brake related, which it would make sense as to why it only does it when the car has been parked...
Currently plan to buy some new calipers, disks and pads anyway. Then use the old ones from the bora after a refurbish on the Vento ithink.

[Sirocco20348]

I have the same problem on my front right rotor. I have the slightest rubbing happening that is causing a minor groove.

It's annoying because it makes a slight squeak every revolution. I took the rotor off and cleaned the mating surfaces. But I have no idea. I have always had niggling issues with QFM pads. They work great on track but something is not right.

Sent from my Nexus 5 using Tapatalk

[guile]

Think its the rear, I do recall my old alignment guy saying the shims I run in the rear put the pads on a slight angle to the disk, so I'm assuming this would make them even closer at one point of contact and probably not helping the cause.

are your brake carriers shimmed the same as your stub axles or doesn't it work like that on a bora? i could be way off but i'm just thinking out loud...

[dylan8]

are your brake carriers shimmed the same as your stub axles or doesn't it work like that on a bora? i could be way off but i'm just thinking out loud...

No they aren't, but the shims are so minor that the guys installing them said a brake shim would have been the thickness of a bit of paper.
Plus Iv had the camber shims in for good 4-5years now, this has only just started happening, so like to think that whileit may be ccontributing, it's not causing all the problems