servo brake

servo brake
noun
1. : a multiple-shoe automobile brake in which the action of one part upon another as a result of the forward motion of the vehicle increases the pressure between the second shoe and the brake drum and so increases the brake's effectiveness
2. : a brake in which pedal or lever power is augmented (as by a servomotor) : power brake

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servo brake,
1. an automobile brake with shoes so connected that one shoe passes on the force exerted on it by the rotating drum to increase the action of the other.
2. = power brake. (Cf.power brake)

Useful english dictionary. 2012.

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