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Brake drum within disc Star wheeladjuster Adjustmentslot Calibre Drum formedby centre ofdisc Brakeshoe Brakedisc Handbrakecable

The most common handbrake layout used on a four-wheel disc brake system has a small auxiliary drum brake mounted inside the brake disc.

A pair of brake shoes, much the same as those in a normal rear drum brake, are moved outwards by the operation of the handbrake lever. They press against a 'drum' formed by the inner surface of the centre of the brake disc.

The shoes are fitted with a star wheel adjuster to compensate for wear. Once this adjuster has been used, the handbrake cable adjuster can be used to take up any remaining slack.

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Adjusting a disc handbrake

Most cars are still fitted with drums on the back wheels with the handbrake operating directly o...