Install the car on a horizontal surface, lift on a jack and lower on support.

Disconnect the socket of the sensor of speed of a wheel of anti-blocking system of brakes.

Fig. 6.60. Chart of check of a form of a signal

Using an oscillograph, check tension signal form for existence of distortions and noise at rotation of each wheel (fig. 6.60).

If there are distortions or noise, check a rotor of the sensor of anti-blocking system of brakes.