Rotational noise front left brake, goes when braking

Sanjøy · Post by **Sanjøy** » Sun Jan 07, 2007 8:04 pm

Just had pads done. Ideas ?

Stewart · Post by **Stewart** » Sun Jan 07, 2007 8:18 pm

Very similar to the symptoms I had before I changed the front wheel bearings. Of course could be a multitude of things.

Rich H · Post by **Rich H** » Sun Jan 07, 2007 8:27 pm

As stewart says, loads of causes, mine was wheel bearing too though....

Sanjøy · Post by **Sanjøy** » Sun Jan 07, 2007 8:40 pm

Forgot to mention had the wheel bearings done at the same time as the pads...

It has been sitting outside for 2 weeks without turnign a wheel.

Will buzz Dan.

Rich H · Post by **Rich H** » Sun Jan 07, 2007 9:07 pm

Rough love time, thrash the tits off it....

Stu160 · Post by **Stu160** » Sun Jan 07, 2007 9:30 pm

Rust on the disc,drive it for a few miles,it will go away

Stu

Victor Meldrew · Post by **Victor Meldrew** » Sun Jan 07, 2007 10:30 pm

Sounds like what I get every time I leave the car at the work car park for two weeks.

The rear pads have a groove accross the face, after a while this groove can fill up with rust deposits and the brakes sound and feel horrendous. You have to take out the pads and clean out the slots and then there almost as good as new.

If your using your car regularly, I wouldnt think you would have this problem. I think it only happens with me because it sits idle for two weeks every month.

Take the pads out and check the groove... then take the car out and thrash the >>>? out of it for a hundred miles or so. As if you need an excuse anyway...

Sanjøy · Post by **Sanjøy** » Sun Jan 07, 2007 10:59 pm

MMCs make a diff here ?why would the noise go when applying the brakes though ?

Victor Meldrew · Post by **Victor Meldrew** » Sun Jan 07, 2007 11:05 pm

Sanjoy wrote:MMCs make a diff here ?why would the noise go when applying the brakes though ?

you got me there...

robin · Post by **robin** » Mon Jan 08, 2007 3:00 pm

Sanjoy wrote:MMCs make a diff here ?why would the noise go when applying the brakes though ?

When the brakes are applied the disk and pads cannot move side-to-side and the pads are locked against the top of the caliper, so any noise caused by rattling or vibration is probably deadened.

When the surface of the disk is rough (caused by rust on steel disks and, err, don't know on MMC disks - perhaps salt crystals or some kind of alloy corrosion) then that layer will make a hiss/rasp sound when just glancing the pad surface (a bit like if you just touch something to a bench grinder you get a hiss).

If it's corrosion on the disks I would expect 99% of the noise to go away for good the first time you do a couple of quick stops from high speed. If it doesn't I would be looking for a stuck piston or seized rear caliper side - this will cause low brake pressure on one of the 8 surfaces and thus this surface won't get cleaned.

Cheers,
Robin

Rich H · Post by **Rich H** » Mon Jan 08, 2007 3:07 pm

maybe re-bed in the brakes?

bertieduff · Post by **bertieduff** » Mon Jan 08, 2007 3:57 pm

I get exactly the same after a couple of weeks non-use. Couple of enthusiastic stops always sorts it out, and gets the change from under the seat.

I'm usually about 25 quid richer every time thanks to rusty disks.

Sanjøy · Post by **Sanjøy** » Tue Jan 09, 2007 12:32 pm

Done the braking and no doff. No braking bias lefto r right when applying.

Sounds as if there were something hanging that is ker-thwhacking. Also got a very worrying metal twang over a pothole this am.

Off to phone Dan.

robin · Post by **robin** » Tue Jan 09, 2007 1:22 pm

Twang is often the springs on the brake pads - I know you've checked, but might be worth double checking!

The other thing it could be is the disk touching the caliper (this happened to Tut, IIRC).

Cheers,
Robin

Sanjøy · Post by **Sanjøy** » Wed Jan 10, 2007 9:00 am

robin wrote:Twang is often the springs on the brake pads - I know you've checked, but might be worth double checking!

The other thing it could be is the disk touching the caliper (this happened to Tut, IIRC).

Cheers,
Robin

Defo think that it is the pads hitting the disk as at lower speeds when I hear it tapping I can make it do a final tap by tapping the brakes.

Okay gonna sound dumb now but the spring is a return spring to pull the padds back when the brake pedal is released ?