Brake Squeal - Advice appreciated!

M

msportpanda

Member
I’m having a bit of a nightmare with a brake related squeal on my Z4M and would really appreciate any advice or insight.

After a spirited drive last month, I noticed some wobbling under hard braking and a new squeak from the front right brake when no brake pressure is applied.

I had to replace the NSF calliper last year as it was seizing, so replaced the OSF this week as I thought it may have started to go.

It’s a single squeak noise as the wheels turn and the frequency increases with speed. It disappears when I lightly press the brake pedal, it also randomly stops squeaking (sometimes after a bump).

New front pads and discs were fitted less than 500 miles ago.

The brake lines are all original. My mechanic doesn’t believe in copper slip on the back of the pads when installing.

Could either of those things cause the squeak and brake dust?
 
Which brake pads did you go with?
I don't have any wobble issues but when i went with Hawk HP+ I did have a squeak for some time. I drive mostly street but have about 5 or 6 track day's a year. (for me at least) it took almost that first session to finally get the pad's worn down enough, not to squeak, and yes I'm rough on brakes at the track.
 
I went with standard brembo pads. I’ve done a few hard decelerations today and it seems to have quietened down a bit.

Going to go for another spin soon and see if it stayed that way!
 
Mixture of possible caliper binding / not floating correctly / incorrect pad fitment / defective wheel beaing.. maybe all three
 
I’m hoping the new caliper has eliminated the possibility of it binding. It does seem like a pad retraction issue, I’ve noticed if I hit an imperfection in the road or turn the wheel more than 90 degrees either way the noise will disappear for a bit.

Will take it apart tomorrow, clean all the surfaces and stick some ceratec on the pads.
 
Do the Brembo pads have the anti-rattle springs/brackets in them that the OE ones do?

IMG_0821.jpeg
 
Took some grease to the pads and anti rattle springs. Made sure everything was seated well.

Found that one of the retaining bolts for the brake disk was sheared and the other was loose. Could this be my problem?

I would’ve though that the wheel and wheel nuts would have held the disc in place even if the disc bolts weren’t present.

Either way, tightened the loose one up and coming up with a plan to extract the sheared one!

Yet to test…
 
msportpanda said:
Took some grease to the pads and anti rattle springs. Made sure everything was seated well.

Found that one of the retaining bolts for the brake disk was sheared and the other was loose. Could this be my problem?

I would’ve though that the wheel and wheel nuts would have held the disc in place even if the disc bolts weren’t present.

Either way, tightened the loose one up and coming up with a plan to extract the sheared one!

Yet to test…
Click to expand...
The little bolts that hold the discs on are irrelevant here. They do nothing more than hold the disc in place, but the wheel bolts would do that as you say once all fastened up. I wouldn't even worry about the sheared one! I've had to bust the head off loads over the years and never replaced them.

I would guess the pads or discs are glazed up. Give the surfaces a scuff up with some emery paper to take the glaze/shine off them. Give that a go...
 
Can’t believe no one has advised you to use some lube.. lol.

I’d recon Ed is on the right track. That’s where I’d start.
 
Could you have buckled your disk? You started by telling us you had wobble under braking following a spirited drive.
Also a squeak that increases frequency with speed tells me you have contact at a certain point in the revolution.
 
Street said:
Could you have buckled your disk? You started by telling us you had wobble under braking following a spirited drive.
Also a squeak that increases frequency with speed tells me you have contact at a certain point in the revolution.
Click to expand...
This...but could also be pad transfer from an OE 'soft road' pad.

A bit of sanding of the disk might help, or running a 'fast road' pad?
 
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