Press a brake pedal several times at the idle engine to create in cavities of the vacuum amplifier the identical pressure close to atmospheric pressure.

Fig. 11.46. Change of a free wheeling of a pedal of a brake: X = 1–6 mm

Press a brake pedal prior to the beginning of notable resistance and measure distance which there passed a brake pedal (fig. 11.46) . The free wheeling of a pedal of a brake should be in limits of 1-6 mm.

Fig. 11.45. Gap measurement between a carving part of the case of the switch and the limiter of a course of a pedal of a brake: And = 0,5–2,4 mm

If the free wheeling of a pedal of a brake differs from demanded value, check distance And (see fig. 11.45 ) between a carving part of the case of the switch and the limiter of a course of a pedal of a brake.