[5ilver-5amurai]

Hello Friends,

Looking to get some info on brake pad / rotor life on the 435i M Sport. I'm sure 335i M Sport data will apply as well.

Wanted to understand at how many clicks people changed out the following:

- Front Rotors
- Front Pads
- Rear Rotors
- Rear Pads

I'm running 5+ years on my factory set up with about 70k km / 44k miles, and there is slight brake squeal coming. No warning from the car yet though.

Advice would be appreciated.

[dmaxdmax]

Not 'exactly' your answer, but usually rotors can go two sets of pads, and the front brakes wear about twice as fast as the rear.

On my manual e46, I got about 60k miles on front pads. Once the warning light goes off, you'll have maybe 3-4 mm of pad surface...depending on your driving, you should get at least 1,000 miles easy.

Depending on your driving style and transmission will determine how long they go for you. Easy enough to get underneath and look, though. With a good led flashlight, you can see the pad thickness. There are only two sensors on the car, one on each axle, and both on piston side of caliper--the assumption is that things are working so both sides wear evenly--usually a good assumption if your brakes are working ok.

[upsidedownfunnel]

The only scientific way to know if you need brake service is by removing the wheel and measure pad thickness and rotor thickness. There is a recommended thickness for both. A little squealing means nothing without more data. The electronic brake life indicator is usually pretty good at warning the owner.

If you're not sure how to do that, then you should be servicing your car at a mechanic and asking them.

[5ilver-5amurai]

Originally Posted by dmaxdmax

Not 'exactly' your answer, but usually rotors can go two sets of pads, and the front brakes wear about twice as fast as the rear.

On my manual e46, I got about 60k miles on front pads. Once the warning light goes off, you'll have maybe 3-4 mm of pad surface...depending on your driving, you should get at least 1,000 miles easy.

Depending on your driving style and transmission will determine how long they go for you. Easy enough to get underneath and look, though. With a good led flashlight, you can see the pad thickness. There are only two sensors on the car, one on each axle, and both on piston side of caliper--the assumption is that things are working so both sides wear evenly--usually a good assumption if your brakes are working ok.

Thanks, good information here!