Seville STS V8-4.6L VIN 9 (1998)
Braking Sensor/Switch: Technical Service Bulletins
Twist-Lock Style Brake Switches - Proper Adjustment
File In Section: 8 - Chassis/Body Electrical
Bulletin No.: 83-83-12
Date: April, 1998
INFORMATION
Subject:
Proper Adjustment of New Twist-Lock Style Brake Switches
Models:
1996-98 Buick LeSabre, Park Avenue, Riviera
1996-98 Cadillac DeVille, Eldorado, Seville
1997-98 Chevrolet Malibu
1998 Chevrolet Cavalier
1996 Oldsmobile Ninety Eight
1996-98 Oldsmobile Aurora, Eighty Eight, LSS, Regency
1997-98 Oldsmobile Cutlass
1999 Oldsmobile Alero
1996-98 Pontiac Bonneville
1998 Pontiac Sunfire
1999 Pontiac Grand Am
This bulletin is being issued to advise that new style brake switches were used beginning in the 1996 model year. The two switches control the brake
lights, cruise control engage/release, TCC lock-up/release and the Brake/Transmission Inter-Lock function. The switches are adjusted by twisting rather
than ratcheting. Using the old adjustment method of pulling up on the brake pedal can break the switch.
A mis-adjusted or damaged switch may cause customer comments such as:
^
Brake lights stay on, draining the battery
^
Cruise control inoperative
^
Higher than normal fuel consumption if TCC cannot engage
^
Brake drag
^
Cruise control takes excess pedal travel to release
The adjustment procedure in the Service Manual should be followed.
Procedure
1.
Insert the stop lamp switch into the retainer until the switch bottoms out against the brake pedal, and the switch actuator is fully depressed.
2.
Turn the brake switch in the retainer clockwise until the travel stop has been reached. At this point it will be locked.
Important:
If the switch is not fully locked into position, a clicking noise may result.
3.
The brake switch plunger should extend outward 0.5 mm to 1.5 mm (0.02 in. to 0.06 in.) if adjusted correctly.
4.
If the distance the plunger extends is too great, the brake switch must be turned counter-clockwise about 45° and set to the correct distance before
locking it in place by turning it clockwise until the travel stop is reached.
