Brake Drum

WARNING: This page is about a different car, the 2006 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

With the drum off the vehicle, measure the drum for diameter variation (oval shape). The diameter variation of the drum braking surface must not exceed specifications listed in the following table.

Measure brake drum runout. Brake drum runout should be checked with the drum mounted on a brake lathe. Brake drum runout should not exceed specifications listed in the following table.

If either of these measurements are not within specification, reface or replace the drum. (Refer to BRAKES/HYDRAULIC/MECHANICAL/DRUM - STANDARD PROCEDURE) .

Fig 1: Drum Maximum Diameter Identification (Inside Drum)

Courtesy of DAIMLERCHRYSLER CORP.

1 - MAXIMUM DIAMETER IDENTIFICATION MARKING

2 - BRAKE DRUM

Always replace the drum if machining will cause the diameter to exceed drum maximum diameter. All brake drums (2) are marked with the maximum allowable brake drum diameter (1). Maximum brake drum diameter can also be found in the following table.

BRAKE DRUM LIMITS

SALES CODE	DIAMETER VARIATION	RUNOUT	RUNOUT (IN 360°)	MAXIMUM DIAMETER
BRB/BRK	0.080 mm 0.003 in.	0.045 mm in 60° 0.002 in. in 60°	0.130 mm 0.005 in.	230.60 mm 9.079 in.
Note: Vehicles without ABS are equipped with BRB drum brakes. Vehicles with ABS are equipped with BRK drum brakes.