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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 04-20-2016, 09:12 PM
Amrathe Amrathe is offline
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Location: South Jersey Shore
Join Date: Nov 2015
Posts: 103
Mein Auto: 2003 e39 525i Sedan
Brake rotors...

Hi, haven't posted in a while, but have a simple question. I plan to do the brakes on my MY03 525i and was looking at the Bosch Quietcast rotors, mostly for price reasons and that the car is a DD and not a weekend warrior. I read and for the price, the quality makes it a god deal. However, when sourcing for the rotors, I notice the rears for the Bosch set shows two sizes for the 525i. A 338mm (13+ inch) rotor and a 295 (11.6 inch) rotor for the same car. Now normally, the rotor should refer to wheel size so obviously a larger wheel could have the larger rotor for better braking and fitment. However, my rims are stock at 16 inches, not 17 or 18+ inches. So at that size, I figure either rotor should fit. So why would they list two rotor sizes? I don't believe BMW made rims smaller than 16 inches for the E39.

If the rotors are only for performance reasons (i.e. sport package vs regular stock) then if I add the larger rotor set will it fit or would there be a problem not with clearance, but with caliper and bracket fitment? Or does the 16inch stock wheel for an '03 would have a clearance issue? The '03 525i had a different style OEM wheel for that year only, so don't know. Any help on this would be appreciated.

- Amrathe
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Old 04-20-2016, 09:25 PM
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Brandon002 Brandon002 is offline
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Location: US
Join Date: Aug 2015
Posts: 1,986
Mein Auto: 2002 530I Sport
You can't just add a larger rotor. You'll need the correct caliper bracket to space the caliper out. Go to realoem.com and put your vin in. Cross reference brake parts.
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Old 04-20-2016, 11:10 PM
Sroor9001 Sroor9001 is offline
Location: Bahrain
Join Date: May 2014
Posts: 1,197
Mein Auto: Bmw 525i 2002
Check your rotor type there is vented which I mean double layer and there is space in between or one part one layer
Mine is one layer I bought this 2 layers rotor and larger brake caliper from a car that have same type of double layer rotor for the rear I mean and fixed it has the same brake pads but diffrence in the caliper space and rotor if you put your caliper in this double layer it'll not fit
Good luck it's better for braking but if you are not speeding no need for that
Take care
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Old 04-21-2016, 04:39 AM
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Fudman Fudman is offline
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Location: Sudbury, MA
Join Date: Apr 2007
Posts: 6,823
Mein Auto: '02 530i Sport auto
The correct part you need is: Bosch 15010065
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