Discussion
Which of the following brakes is commonly used in motor cars ?
Answer: A
The brake commonly used in motor cars is the internal expanding shoe brake.
In this drum brake, two curved shoes inside a drum attached to the wheel are pushed outwards against the drum's inner surface by a cam or hydraulic cylinder. Its compact, enclosed construction suits vehicle wheels, which is why it has long been the standard car brake, particularly on rear wheels.
Band brakes and band and block brakes are used on hoists, winches and cranes, and the external shoe (block) brake is typical of railway wagons and some machinery, not of cars.
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