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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.

Brake rotor minimum thickness

Front

Rear

E90 Normally-aspirated

18.4mm (0.88 in)

22.4mm (0.88 in)

E90 Turbocharged

28.4mm (1.1 in)

24.4mm (0.96 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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Comments and Suggestions:
Berettaguy Comments: On the E90 turbocharged rear specification, 24.4 mm actually converts into .96 inches. Is the spec 24.4 mm correct or is 0.88 inches the correct specification?
March 3, 2017
  Followup from the Pelican Staff: That is a typo, should be 0.96. - Nick at Pelican Parts  
Adam Reddy Comments: Hi - would you please clarify the rear rotor minimum thickness? The articles refer to 22.4 for a normally aspirated car, but 20mm seems to be the thickness for new rear rotors in your store. Thanks!
January 25, 2017
  Followup from the Pelican Staff: That is the spec BMW lists. I would give the part specialists a call, the listing may be displayed wrong or different for your model. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
.

I will also check other sources, maybe the BMW spec was a typo in their info. - Nick at Pelican Parts
 

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Page last updated: Sun 10/15/2017 02:23:02 AM