Table of contents: Examination ↓ Replacement ↓
Examination
1. The switch sensor is located on the left side of the bracket near the top of the foot brake pedal, - the speed control system switch sensor is located on the right side. The switch sensor ensures that the brake lights in the rear combination lamp assemblies are turned on when the foot brake pedal is depressed.
2. Visually check that the brake lights operate properly when the pedal is depressed and that they turn off when the pedal is released.
3. If the brake lights do not come on, make sure the pedal adjustments are correct (see section Adjusting the foot brake pedal), then adjust the actual sensor switch.
4. The sensor-switch is attached to the support bracket using a lock nut. Loosen the lock nut and rotate the sensor-switch until the gap between the end of its plunger and the pedal stop does not exceed the range of 0.3÷1.0 mm (the plunger must be in a free state). Tighten the lock nut and recheck the proper functioning of the sensor switch.
5. If adjusting the position of the switch sensor does not correct the situation, then there is a power failure to the switch sensor or a defect in the assembly itself. Using a voltmeter or a test lamp, check for voltage at the switch sensor connector. When the pedal is released, voltage should be present only at one of the connector terminals, and when pressed, at both. A faulty switch sensor must be replaced.
Replacement
1. Disconnect the electrical wiring from the sensor switch.
2. Loosen the lock nut and unscrew the sensor switch from the support bracket.
3. Installation is carried out in reverse order.
4. Adjust the foot brake pedal (see section Adjusting the foot brake pedal), then, if necessary, adjust the sensor switch (see above).