POWER MASTER SERVICE KITS REPAIR KIT PART NUMBERS

1986 PARISIENNE WAGON (BLEED SYSTEM, REPLACE COMBINATION VALVE)

"This butletin supersedes bulletin 86-5-19A, dated 9/88. This bulletin has been revised to specify 'brass' valve for PIN 25509419 and clarify this brass valve is the only type now available; added a sentence under 'Diagnosis of Condition' regarding cast iron combination valves."

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 brass valve Part Number 25509419 to prevent reoccurrence of the condition (this brass valve is the only type now available from GMSPO). The entire brake system should be re-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.

Any cast iron combination valve in dealer stock may be used on other applications.

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.

PART LABOR OP. LABOR TIME NUMBER DESCRIPTION NUMBER NUMBER ------ ------------ ------ ------ 18011279 Pump and Motor Asm. Package H0980 .8 18014977 Pressure Switch Asm. Package H0778 .4 18014978 Accumulator Asm. Package H0985 .3 18013293 Reservoir Cover Asm. 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.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.