KIC Catalog

Brake Drum & Rotor Identification & Replacement

Brake Drum Identification

1. When specifying replacement brake drums & rotors the following information is required:

• The manufacturer’s name

• The manufacturer’s part or casting number

• Description of any other markings appearing on the drum or rotor.

2. If that information isn’t available, the following is the next best:

• Vehicle manufacturer

• Vehicle model

• Axle or spindle size

• Whether disc or spoke wheel application

• Brake size and type of actuation (S-cam, Wedge, Air, Hydraulic, etc.)

• Whether inboard or outboard mounting

3. If that information isn’t available, the following is required.

• It will be necessary to make accurate measurements to determine the type and size of

the brake drum or rotor needed, particularly if the part number can not be determined.

The photographs following show the items to measure and check prior to ordering a new

brake drum or rotor.

TMC Recommended Practices: Used by permission

Width of braking surface

Overall depth

Pilot/hub diameter

Bolt circle diameter

Size & number of bolt holes

Diameter brake surface

(allow for drum wear)