By means of the manual vacuum pump create in the amplifier of a brake vacuum - 66,7 kPa (500 mm of mercury.).

Fig. 6.29. Adjustment of length of a press rod

Weaken a lock-nut and adjust length of a press rod so that length "In" became equal to a preset value (fig. 6.29).

Regulate, so far the gap between the acting part of a rod and the screw will not become equal 0 mm – nominal length at indications of the vacuum gage of 66,7 kPa (500 mm of mercury.)