The free wheeling of a pedal serves one of criteria for check of serviceability of the brake system. At the same time the provision of a pedal in many respects ensures correct functioning of system. If the pedal is from a floor at distance which is more standard, perhaps incomplete disinhibition of wheels at a pedal otpuskaniye (at the same time usually there is no free wheeling of a pedal). If the pedal is too low, the decrease in efficiency of brakes caused by reduction of the working course of a pedal is possible.

You will need a ruler.

1. Measure distance from an overlay of a pedal to a floor in a free state.	2. Press a hand a pedal until increase in resistance and measure distance from an overlay of a pedal to a floor in this situation. The difference between these two measurements will also be a free wheeling of a pedal which has to make 3–6 mm.

Measure distance from an overlay of a pedal to a floor in the pressed situation, for this purpose execute the following.

1. Launch the engine, several times sharply press a pedal of a brake and release a pedal.

2. Press a brake pedal once again and measure distance from a floor to edge of a pedal, it has to make not less than 80 mm. If value is less than specified, replace the vacuum amplifier (see. "Replacement of the vacuum amplifier of brakes").