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Suspension & Braking Forum by BimmerWorld
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Old 05-15-2017, 09:58 AM   #1
nated066
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Low speed brake squeak

Over the past 2 weeks my e46 has developed a brake squeak at low speeds.

My rotors and pads are only about 9 months old so I'm unsure as to the problem.

If I get up a good speed and hit the brakes hard, the squeak will subside for a day or so, almost like there's buildup on the rotor itself.

Any ideas?
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Old 05-15-2017, 10:01 AM   #2
ryanr1299
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Quote:
Originally Posted by nated066 View Post
Over the past 2 weeks my e46 has developed a brake squeak at low speeds.

My rotors and pads are only about 9 months old so I'm unsure as to the problem.

If I get up a good speed and hit the brakes hard, the squeak will subside for a day or so, almost like there's buildup on the rotor itself.

Any ideas?
Most brake squeak is simply metal on metal noise due to vibration. Pop the calipers off and re seat the pads, making sure to clean and lubricate where appropriate. That's probably all it needs.

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Old 05-15-2017, 10:07 AM   #3
nated066
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Most brake squeak is simply metal on metal noise due to vibration. Pop the calipers off and re seat the pads, making sure to clean and lubricate where appropriate. That's probably all it needs.

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Thanks, I will give that a try tonight
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Old 05-19-2017, 09:57 PM   #4
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Hey so I popped the calipers, cleaned pads and rotors, applied anti squeak to the backs of the pads, and the brakes still squeak pretty fierce.

Even though the rotors are only 9 months old, could it be caused by warping?
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Old 05-19-2017, 10:16 PM   #5
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Originally Posted by nated066 View Post
Hey so I popped the calipers, cleaned pads and rotors, applied anti squeak to the backs of the pads, and the brakes still squeak pretty fierce.

Even though the rotors are only 9 months old, could it be caused by warping?
Let's get more info here.

Is the noise coming from the front, rear, or both?
Is the noise only when braking or also while moving and not braking?
Which brakes were replaced 9 months ago? Front, rear, both?

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Old 05-19-2017, 10:23 PM   #6
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Hey,

The noise appears to be coming from the rear passenger side brake.

It only occurs while braking. It gets progressively worse while driving (almost as if the rotor heats up and makes it worse)

All brake pads and rotors were replaced 9 months ago. Everything is pretty well new.
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Old 05-19-2017, 10:37 PM   #7
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Originally Posted by nated066 View Post
Hey,

The noise appears to be coming from the rear passenger side brake.

It only occurs while braking. It gets progressively worse while driving (almost as if the rotor heats up and makes it worse)

All brake pads and rotors were replaced 9 months ago. Everything is pretty well new.
What kind of pads? Some aftermarket pads are shimless and can be a real pain to get quiet.

Did you lube the caliper pins? Not necessarily saying you should or shouldn't, it's up to you, just asking.

There are mixed opinions on lubricating the caliper guide pins, but it's been known to help brake noise in some cases. I lube them out of habit (from long before working on bimmers), but I guess BMW says they don't need lube and some seem to think lubing then will invite dirt and debris or maybe cause other problems. At minimum the pins should be removed and cleaned real well before putting the brakes bake together.

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Old 05-19-2017, 11:56 PM   #8
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You said you cleaned the brakes/calipers -- what did you use? I've typically resorted to Brakleen (or similar) if normal, clean water doesn't cut it.

Also, what brand of rotors and pads are you using?

When you checked the rear-right brakes, did the rotor have some kind of uneven wear or lip or something? I had a truck that did that; once the rotors were warm, it was LOUD -- turns out one of the pads, while it fit just fine into the caliper, was the wrong size. It caused a small lip to form on the rotor and made that squeal.
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