Brake Rattle Over Bumps

[thetypicalm3guy]

Having bad brake rattling over harsh bumps. Most noticeable when driving over those reflectors in the middle of the double yellow lines. I believe this started after i changed my brakes to Zimmerman rotors and OE brake pads, and new anti rattle clips, and new guide pins. Its only the front, and I believe both sides but definitely driver side for sure. I have removed and installed the brakes 5 times now and i cannot for the life of me figure out whats going on. My best guess is that the inner pad ears are hitting the caliper over harsh bumps. Anyone else have this issue?

[eacmen]

Having bad brake rattling over harsh bumps. Most noticeable when driving over those reflectors in the middle of the double yellow lines. I believe this started after i changed my brakes to Zimmerman rotors and OE brake pads, and new anti rattle clips, and new guide pins. Its only the front, and I believe both sides but definitely driver side for sure. I have removed and installed the brakes 5 times now and i cannot for the life of me figure out whats going on. My best guess is that the inner pad ears are hitting the caliper over harsh bumps. Anyone else have this issue?

How do you know the noise is brake related?

[thetypicalm3guy]

When i slightly hold the brake and go over bumps the noise goes away

[jet_dogg]

Man you got all kinds of problems bro.

[thetypicalm3guy]

Man you got all kinds of problems bro.

Lol yes I do

[eacmen]

Snap a photo of the anti rattle clips? They should be *very* tight.

On each inboard brake pad there are three metal prongs that slide into the piston bore. If you’re pads don’t have these prongs that may be the source of the rattle. Most replacement pads have the prongs but some specialty or cheap pads will not.

[thetypicalm3guy]

Snap a photo of the anti rattle clips? They should be *very* tight.

On each inboard brake pad there are three metal prongs that slide into the piston bore. If you’re pads don’t have these prongs that may be the source of the rattle. Most replacement pads have the prongs but some specialty or cheap pads will not.

I used OE Jurid pads from BMW dealer. They had the 3 prongs on the back of the inner pad. I will upload photos to show how things look.

[eacmen]

I used OE Jurid pads from BMW dealer. They had the 3 prongs on the back of the inner pad. I will upload photos to show how things look.

Maybe the rubber caliper guide bushings are worn out?

[Arith2]

Maybe the rubber caliper guide bushings are worn out?

This makes the most sense to me. These cars are pretty old

[thetypicalm3guy]

Maybe the rubber caliper guide bushings are worn out?

Just replaced both front side with OE ATE bushings from FCP Euro, Still having rattling over bumps.

I am about to rip my hair out, this is what I have replaced:

OE Jurid BMW Brake Pads
Zimmerman Rotors from FCP Euro
OE Brake Pad Anti rattle clips
OE Brake Guide pins
OE Brake Guide pin bushings


I really don't know what else to replace, seems like ive done it all.


Any help appreciated.

[sapote]

Make sure the caliper mounting big bolts are not loose.

[thetypicalm3guy]

Make sure the caliper mounting big bolts are not loose.

Good point, checked them and they are torqued to 81 ft lbs

[heinzboehmer]

Good point, checked them and they are torqued to 81 ft lbs

Are you referencing an older version of the torque spec pdf? They're supposed to be torqued to 48 ft lb. Probably not gonna solve your rattle but FYI.

Edit: This is wrong, see my comment below.

[eacmen]

Shot in the dark, you have these clips installed on the caliper right?

https://www.fcpeuro.com/products/bmw-disc-brake-anti-rattle-clip-rear-34211157046oe

[sapote]

I believe this started after i changed my brakes to Zimmerman rotors and OE brake pads, and new anti rattle clips, and new guide pins.

Remove the clip holding caliper to carrier (anti-rattle), then try to wiggle the caliper -- up/down and in/out -- and see how much free plays. If too much plays then the caliper rubber bush (over the pin) is too worn.