The amplifier of a brake drive works with use of the vacuum which is creating only in operating time of the engine. Therefore never practise car movement by inertia with the switched-off engine.
If the amplifier of a brake drive does not function, for example, at towage of the car or at malfunction of the amplifier, it is necessary to press much more strongly a brake pedal to compensate absence of additional effort to the brake drive, the amplifier created at normal work.
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