Removing
Set the car to a working post, brake with a parking brake and turn off the ignition.
Disconnect the wiring harness connector from the brake light switch.
Remove the brake light switch by turning it a quarter of a turn counterclockwise.
Installation
Attention. Incorrect adjustment of the brake light switch can cause premature wear of the brake pads, as well as deviations in the operation of the electronic engine control system (ECM).
Attention. To ensure proper operation of the brake light switch:
- it is not allowed to remove the movable toothed rod from it; when the rod is disconnected from the switch, the switch must be replaced;
- it is not allowed to adjust the switch rod extension more than three times; after three unsuccessful adjustment attempts, the switch must be replaced;
- after the switch is removed or the adjustment is violated during routine maintenance, the switch must be replaced.
Before installing the brake light switch, the protrusion of the toothed rod must be adjusted.
Figure 7-1 - Adjusting the protrusion of the brake light switch rod: 1 - brake signal switch; 2 - rod of the brake signal switch; X - adjusting dimension
Measure the stem protrusion 2, Figure 7-1, the protrusion must correspond to dimension X = 28 mm. In case of discrepancy, carefully pull the stem out of switch 1 by the indicated amount (metal ruler).
Make sure the brake pedal is securely connected to the vacuum booster tappet. Depress pedal 1, Figure 7-2, brakes by hand. While holding the brake pedal depressed, install the brake light switch in the hole in the bracket 3 of the pedal assembly and secure by turning it a quarter of a turn clockwise. Carefully return the brake pedal to its original position.
Figure 7-2 - Installing the brake light switch: 1 - brake pedal; 2 - rod of the brake signal switch; 3 - pedal assembly bracket; 4 - brake signal switch; 5 - stem bushing
When the brake pedal is returned, the extension of the stem 2 of the brake light switch is automatically adjusted (the rod is recessed into the switch by the required amount, characteristic clicks are heard when the rod teeth pass through the fixed positions).
After returning the pedal, check the protrusion of the sleeve 5 of the switch rod, the protrusion of the sleeve beyond the end of the switch body 4 is not allowed, if the sleeve protrudes, repeat the adjustment.
Final adjustment of the brake light switch
Figure 7-3 - Final adjustment of the brake light switch: 1 - brake pedal; 2 - brake signal switch; 3 - rod of the brake signal switch; 4 - probe 2 mm thick
Depress the brake pedal by hand.
Place a feeler gauge 4 2 mm thick between the stem 3, Figure 7-3, of the switch and the brake pedal 1 and carefully return the pedal to its original position (probe 2 mm).
Depress the pedal again and remove the dipstick.
Adjustment completed.
Connect the wiring harness connector to the brake light switch.