Brake drums are used predominantly on rear axles of smaller and medium-sized cars, where the self-energising geometry of drum brakes provides adequate retardation at a lower production cost than disc systems. The drum — a cast-iron cylinder that rotates with the wheel hub — provides the friction surface against which the brake shoes are pressed. Wear manifests in two ways: gradual scoring of the internal braking surface from shoe contact, and thermal cracking from repeated hard braking that overheats the metal. A drum that exceeds its maximum wear diameter, indicated in millimetres on the drum face, must be replaced rather than machined, since thinning the wall reduces heat dissipation capacity and risks structural failure under emergency braking. Vibration felt through the car during braking — sometimes described as a pulsing sensation in the brake pedal — is a common symptom of an oval or scored drum. Replacement drums must match the OE specification for internal diameter, bell mounting flange, and wheel stud pattern; TRW and Delphi are two well-known original-equipment suppliers for rear drum hardware across Ford, Opel, Renault, and Fiat platforms. As with callipers, drums should be replaced in axle pairs to preserve symmetrical braking force and even shoe wear across both rear wheels.
Brake drum fitment depends on the internal diameter, the bell flange depth, the wheel stud pattern, and the hub bore — all of which are chassis-specific and often differ even between trim levels of the same model. Use the make-model-year-engine selector on this page to filter drums confirmed for your vehicle. You can also check the diameter and part number cast into the drum face — usually the maximum wear limit is cast there too — and cross-reference against the OE numbers listed. Fitting a drum with the wrong internal diameter will cause immediately incorrect shoe-to-drum clearance and require shoes to be adjusted or replaced.
Yes — drum brakes are designed to operate as a matched pair on each axle. Replacing only one drum means the two sides will have different internal diameters and surface finishes, creating unequal friction forces during braking and causing the car to pull towards the side with the newer, larger drum. New shoes should also be fitted whenever drums are replaced, as existing shoes will be profiled to the old drum's slightly oval surface and will take longer to bed in against the fresh friction surface, temporarily reducing braking efficiency.
OEM brake drums are cast and machined to the vehicle manufacturer's exact specification for wall thickness, surface hardness, and heat treatment. TRW and Delphi are typical tier-one suppliers. Quality aftermarket drums from established names like A.B.S. or KAWE are produced to equivalent standards and perform comparably under normal use. Unbranded or very cheap drums may use lower-grade cast iron with insufficient hardness, which leads to accelerated surface scoring and may develop cracks after prolonged heavy braking more quickly than OEM equivalents.
A pulsing or vibrating brake pedal is the most recognisable symptom of a drum that has become oval through heat distortion — the shoes alternately grip and release as the drum rotates past the high spots. A grinding or rasping noise from the rear during light braking suggests the shoes have worn through and the backing plate is contacting the drum surface. Grooves visible inside the drum, or a sharp lip on the inner edge of the braking surface where the shoes no longer reach, indicate a drum worn beyond its service limit that should be replaced without delay.
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