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BMW Brake Rotor Specification Checking
 
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Pelican Technical Article:

BMW Brake Rotor Specification Checking

Nick Czerula

Time:

1.5 hours

Tab:

$50

Talent:

**

Tools:

Micrometer, jack and jack stands

Applicable Models:

BMW 325i Sedan (2006)
BMW 325xi Sedan/Wagon (2006)
BMW 328i Coupe/Conv (2007-13)
BMW 328i xDrive Coupe (2009-13)
BMW 328i xDrive Sedan (2009-11)
BMW 328i xDrive Wagon (2009-12)
BMW 328i/xi Sedan (2007-11)
BMW 328i/xi Wagon (2007-12)
BMW 328xi Coupe (2007-13)
BMW 330i/xi Sedan (2006)
BMW 335d/i/xi Sedan (2007-11)
BMW 335i xDrive Coupe (2009-13)
BMW 335i xDrive Sedan (2009-11)
BMW 335i/is Coupe/Conv (2007-13)
BMW 335xi Coupe (2007-13)

Parts Required:

Brake rotors

Hot Tip:

Measure in 10 locations and mark each location after measuring.

Performance Gain:

Brake performance restored

Complementary Modification:

Replace brake pads.

This tech article will go over measuring your brake rotors to see if they require replacing. When checking brake rotor thickness, measure rotor in about 10 different spots, mark each spot to keep track of where you have measured. If rotor does not meet minimum thickness then replace, remember to always replace brake rotors in pairs. If your brake rotor passes thickness but you have a pulsation while using brakes, replace brake rotors. Also inspect rotors for overheating, cracks and rust on braking surface.

Most factory rotors and some aftermarket rotors will have a minimum thickness stamped on the rotor. This will be in area of hat or hub flange. Clean rust away from rotor to uncover specs.

Lift axle of vehicle you are measuring brake rotors on. See our tech article on jacking up your vehicle.

Refer to the minimum rotor thickness chart below while measuring.

 

Front

Rear

Brake rotor minimum thickness
E90 Normally-aspirated

22.4mm (0.88 in)

22.4mm (0.88 in)

Brake rotor minimum thickness
E90 Turbocharged

28.4mm (1.1 in)

24.4mm (0.88 in)

Using a micrometer, measure brake rotor in at least 10 different places.
Figure 1

Using a micrometer, measure brake rotor in at least 10 different places. I like to mark that place of measurement using a marker. Sometimes finding a rotor with thickness variations can help you find the source of a brake pulsation.

It is also a good idea to measure your brake pads.
Figure 2

It is also a good idea to measure your brake pads. Replace when they are at or under 3 mm. The measurement gauge I am using in this photo is color coded to help identify how close to replacement your brake pads are.

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Page last updated: Wed 1/18/2017 02:22:36 AM