Electra Park Avenue V6-231 3.8L VIN 3 FI (1988)
Brake Hydraulic Unit: All Technical Service Bulletins
Brakes - No Assist/ABS Lamp ON after Pump/Motor Service
Bulletin:
88-5-6
Date:
Mar., '88
Ref. No.:
88-102-5
Corp. Ref. No.: 815001R
SUBJECT:
"BRAKE" AND "ANTI-LOCK" WARNING LAMPS ON, LACK OF POWER BRAKE ASSIST AND CONTINUOUS PUMP
OPERATION AFTER ABS PUMP/MOTOR ASSEMBLY REPLACEMENT
MODELS AFFECTED: 1988 LESABRES, ELECTRAS, RIVIERAS, AND REATTAS EQUIPPED WITH TEVES ANTI-LOCK BRAKE SYSTEM
Effective in the 1988 model year, certain production changes were made to the pump/motor assembly used on Buick models equipped with the optional
Teves Anti-Lock Brake System. The 1988 pump/motor assembly utilizes a cast iron body while past model assemblies are made of cast aluminum.
Although some early 1988 vehicles were produced with aluminum pump/motor assemblies, all GMSPO service assemblies for the 1988 model use cast
iron construction.
After installing a service pump/motor assembly on a 1988 vehicle, care must be taken in priming the pump which may, under some circumstances, run
continuously without building pressure in the ABS accumulator when the ignition key is turned on for the first time after a new pump is installed. If this
condition occurs, both the red "BRAKE" warning lamp and the amber "ANTI-LOCK" warning lamp will be illuminated and the system will demonstrate
a lack of power brake assist.
If this condition is encountered, use the following procedure to assist in pump priming. It should be noted that this procedure applies only to new, cast
iron body 1988 model service pump/motor assemblies. Once the pump has primed and has developed pressure, this condition will not occur. Refer to the
appropriate Service Information Manual, Section 5E or 5E1, for diagnosis of other conditions.
To assist in priming a new 1988 replacement ABS pump/motor assembly:
1.
Be sure that the new pump/motor assembly is properly installed as described in Service Information Manual Section 5E.
2.
Turn the ignition switch to the RUN position. Pump motor should start and run for approximately 30 seconds before turning off again. If the pump
does not turn off within 30 seconds, allow it to run for an additional 30 seconds before proceeding to next step. In some cases, the new 1988
pumps will self-prime if they are allowed to run for an additional length of time.
CAUTION: Do not allow the pump to run continuously for more than 60 seconds as the pump may overheat.
