K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Brake Bleeding: Technical Service Bulletins
Brakes - Modified Brake Bleeding Tool
GMC NUMBER:
91-5-71
GROUP:
5 Brakes
DATE:
March, 1991
CORPORATE
NUMBER:
165002
SUBJECT:
BRAKE BLEEDING TOOL MODIFICATION
MODELS:
1985-91 M VANS,
1988-91 C/K TRUCKS,
1989-91 S/T TRUCKS,
1990-91 L VANS AND R/V TRUCKS EQUIPPED WITH KELSEY
HAYES BRAKE COMBINATION VALVE
This bulletin describes a modification which must be made to existing tool J-35856 which must be used when pressure bleeding the brake system.
J-35856 "Proportioning Valve Depressor" has been replaced and superseded by J-39177 "Combination Valve Pressure Bleeding Tool" for the Kelsey
Hayes combination valve on the above mentioned cars and trucks.
Important
Failure to modify or replace J35856 may result in an ineffective bleed or damage to the combination valve.
Figure 1 - Bleed Valve Tool J-35856
Dealers may order J-39177 to replace J-35856 or modify all J-35856 tools in the following manner (Figure 1).
1.
Remove the red plastic handle from the tool.
2.
Clamp the tool carefully but securely in a bench vise with the three prongs accessible.
3.
File down the raised "dimple" from the center prong until the surface area is smooth.
The removal of the "dimple" is all that is necessary to modify the tool. The attached label should be applied to any modified J-35856.
Additional labels may be obtained at no charge from Adistra Corporation (313-455-7658). Be sure to provide your dealer code and ask for J-39177
Replacement Sticker.
