Parisienne V8-307 5.0L (1986)
Brake Proportioning/Combination Valve: All Technical Service Bulletins
Brake - Increased Pedal Travel at Higher Mileage Use
Number
86-5-19A
Date
9/88
Subject:
INCREASED PEDAL TRAVEL - POWERMASTER (BLEED SYSTEM, REPLACE COMBINATION VALVE)
1986 PARISIENNE MODELS
"This bulletin supersedes bulletin 86-5-19, dated 5/87. This bulletin has been revised to include diagnostic procedures and additional part information."
DIAGNOSIS OF CONDITION:
Some 1986 Parisienne Wagons may experience increased pedal travel at higher mileage/extended use. This may be the result of air ingestion at the
combination valve and traveling to the left front caliper.
In order to diagnose this condition, bleed the left front brake assembly. If this results in less pedal travel, the combination valve should be replaced with
valve P/N 25509419, the entire brake system should be bled, and master cylinder fittings checked for proper torque. If the pedal travel is still long and no
air is found after the initial bleed, refer to the Service Manual for the servicing procedure.
ADDITIONAL SERVICE INFORMATION:
Some dealers are still replacing the whole Powermaster unit instead of using the appropriate service kits available for the Powermaster assembly. Proper
diagnosis per the Service Manual will indicate the correct kit to use.
The following repair kits have been released to assist in servicing the Powermaster brake units. The labor times indicated include time for the functional
system check and diagnostic procedure.
LABOR
LABOR
PART NUMBER
DESCRIPTION
OPERATION
TIME
18011279
Pump and Motor Assembly Package
H0980
.8
18014977
Pressure Switch Assembly Package
H0778
.4
18014978
Accumulator Assembly Package
H0985
.3
18013293
Reservoir Cover Assembly Package
H0610
.2
18011398
Boot Package
T1377
.4
18010875
Bracket Package
T1378
1.1
18011403
Sump Hose Package
H0745
.3
Parts are currently available from GMSPO.