S10/T10 Blazer 2WD V6-262 4.3L VIN Z (1994)
Brake Bleeding: Service and Repair
With VCM/Four Wheel Antilock Brake System
VCM/FOUR WHEEL ANTILOCK BRAKE SYSTEM BLEEDING
The brake pressure modulator valve (BPMV) should be bled after replacement or if air is trapped in it. Bleeding should not be necessary if the fluid is
not contaminated or no air is in the BPMV. There are internal bleed valves on each side of the BPMV that open internal channels. Open the internal
bleed valves 1/4 to 1/2 turn before bleeding. Should the module need bleeding, it must be bled after the master cylinder and before the wheel cylinders
and calipers.
NOTICE: The ignition switch must be in the "OFF" position or false trouble codes could be set to memory.
Tools Required:
- J 39177 Combination Valve Pressure Bleeding Tool (Three required)
- TK 00000 Tech-1 Scan Tool
- TK 02650 RWAL/4WAL Cartridge Kit or 3000003 Mass Storage Cartridge
- A modified J 35856 Combination Valve Pressure Bleeding Tool can be used in place of J 39177 providing you remove the dimple from it first.
Important: Expect to use two quarts of brake fluid to thoroughly bleed the system.
Fig. 59 EHCU/BPMV Module Bleeding
1. Open the internal bleed valves on the sides of the BPMV 1/4 to 1/2 turn each (A).
2. Install J 39177 on the left high pressure accumulator bleed stem (C) of the BPMV.
3. Install J 39177 on the right high pressure accumulator bleed stem (C) of the BPMV.
