GM Bonneville/Eighty Eight/LeSabre 1986-1999

Brake Light Switch

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REMOVAL & INSTALLATION



1987-95 Vehicles

See Figure 1

  1. Disconnect the negative battery cable.
  2.  
  3. If necessary for access, remove the instrument panel sound insulator(s).
  4.  
  5. If equipped, loosen the tubular clip from the stoplight switch assembly.
  6.  
  7. Detach the electrical connector from the rear of the switch assembly.
  8.  
  9. On 1991-95 vehicles, disconnect the vacuum hose from the switch.
  10.  
  11. Remove the stoplight switch from the vehicle.
  12.  



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the brake light switch mounting, and proper installed position

To install:
  1. Connect the switch and install it, as shown in the accompanying figure. Make all of the connections, including the vacuum hose, before installing the switch. Make sure the connectors are fully seated.
  2.  
  3. Fully depress the brake pedal, then hold it in that position.
  4.  

When pressing the switch into the mounting bracket, do NOT use more than 25 lbs. (111 Nm) of side load pressure to the 2 terminal housing connectors.

  1. Install the switch, with all of the connections already made, into the mounting bracket. Press the switch in until you can't hear any more clicks, and all retaining tabs are seated.
  2.  
  3. Adjust the switch as outlined later in this section.
  4.  
  5. If removed, tighten the tubular clip to the stoplight switch assembly.
  6.  
  7. Install the instrument panel sound insulator.
  8.  
  9. Connect the negative battery cable.
  10.  

1996-99 Vehicles

See Figures 2 and 3

These vehicle utilize 2 switches with different retainers. The TCC/ABS switch and the stop lamp/BTSI switch retainers are two different sizes. The TCC/ABS switch retainer (upper) is larger (5/8in. diameter), and the stop lamp/BTSI switch retainer (lower) is smaller (1/2in. diameter). The brake pedal switch retainer has locating tabs in which the pointer tab of the retainer must point to the locating mark on the brake pedal switch bracket. Both retainers have locating marks that face the 12 o'clock position when they are installed.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the instrument panel sound insulator(s), as necessary for access to the switch.
  4.  
  5. Twist the upper or lower switch, as applicable, counterclockwise to unlock it, then pull it out of the retainer.
  6.  
  7. Detach the electrical connectors from the switch and remove it from the vehicle.
  8.  



Click image to see an enlarged view

Fig. Fig. 2: Exploded view of the brake pedal switch mounting for 1996-99 vehicles

To install:

When installing the brake pedal switches, it is very important that the brake pedal remain in the full up or at rest position, or damage to the brake system and/or switch misadjustment will occur.

  1. Attach the electrical connectors to the switch.
  2.  
  3. Slide the upper or lower switch (with all of the connections made) into the retainer. Press the switch in until the switch plunder if fully depressed into the switch barrel. Twist the switch clockwise until travel stop has been reached (about 60°). With the switch fully locked, the electrical connector will be in the 3 o'clock position.
  4.  



Click image to see an enlarged view

Fig. Fig. 3: Brake pedal switch locked position

  1. Install the instrument panel sound insulator(s).
  2.  
  3. Connect the negative battery cable.
  4.  

ADJUSTMENT



1987-95 Vehicles
  1. Pull the brake pedal rearward, until no clicks are heard. Then release the pedal. Repeat this step to make sure no audible clicks remain.
  2.  
  3. Check the adjustment of the switch. Compare the installation with the accompanying figure. Only the notch should be visible. If the plunger is visible or the notch is not, repeat the adjustment procedure.
  4.  
  5. The proper switch adjustment is achieved when no clicks are heard when the pedal is pulled upward and the brake lights stay OFF when the brake pedal is released.
  6.  

1996-99 Vehicles

The switches are self-adjusting when they are installed properly in the fully locked position. The twist lock switches do not require any further adjustment.

 
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