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HOMESERVICE MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSBRAKE PRESSURE MODULATOR VALVE - BLEED PROCEDURE
1990 Chevrolet Lumina APV V6-191 3.1L
Brake Pressure Modulator Valve - Bleed Procedure
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Brake Pressure Modulator Valve - Bleed Procedure
Number: 93-12-5
Section: 5
Date: SEPT. 1992
Corporate Bulletin No.: 263003R
ASE No: A5
Subject:
REVISED BRAKE PRESSURE MODULATOR VALVE (BPMV) BLEED PROCEDURE
Model and Year:
1990-93 LIGHT DUTY TRUCKS WITH 4WAL
SERVICE UPDATE
The brake pressure modulator valve (BPMV) (formerly called the EHCU) 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 (item A, figure 1) 1/4 to 1/2 turn before bleeding. Should the BPMV need bleeding, it must be bled after the master cylinder and before the wheel cylinders and calipers.
NOTE:
The ignition switch must be in the "OFF" position or false diagnostic 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 RWAU4WAL Cartridge Kit
IMPORTANT
You can expect to use two quarts of brake fluid to thoroughly bleed the system.
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 (figure 1).
3. Install J 39177 on the right high pressure accumulator bleed stem (C) of the BPMV (figure 1).
4. Install J 39177 on the combination valve (figure 2).
5. Check the master cylinder reservoir fluid level and fill if needed.
6. Bleed the brakes as described in SECTION 5.
7. Close the internal bleed valves.
TIGHTEN
* Internal bleed valves (A) to 7 N-m (60 lbs.In.).
8. Remove the three J 39177 Combination Valve Pressure Bleeding Tools.
9. Check the master cylinder reservoir fluid level and fill if needed.
10. With the Ignition switch "ON" and the engine off, do six function tests with the Tech-1 scan tool.
11. Repeat the wheel cylinder and caliper bleed procedure as many times as needed to remove the remaining air in the hydraulic system.
12. Apply firm pressure to the brake pedal and evaluate brake pedal feel.
13. Repeat the bleed procedure if needed.
Make sure you have a good, hard brake pedal before starting the engine and moving the vehicle.
Section: 5
Date: SEPT. 1992
Corporate Bulletin No.: 263003R
ASE No: A5
Subject:
REVISED BRAKE PRESSURE MODULATOR VALVE (BPMV) BLEED PROCEDURE
Model and Year:
1990-93 LIGHT DUTY TRUCKS WITH 4WAL
SERVICE UPDATE
The brake pressure modulator valve (BPMV) (formerly called the EHCU) 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 (item A, figure 1) 1/4 to 1/2 turn before bleeding. Should the BPMV need bleeding, it must be bled after the master cylinder and before the wheel cylinders and calipers.
NOTE:
The ignition switch must be in the "OFF" position or false diagnostic 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 RWAU4WAL Cartridge Kit
IMPORTANT
You can expect to use two quarts of brake fluid to thoroughly bleed the system.
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 (figure 1).
3. Install J 39177 on the right high pressure accumulator bleed stem (C) of the BPMV (figure 1).
4. Install J 39177 on the combination valve (figure 2).
5. Check the master cylinder reservoir fluid level and fill if needed.
6. Bleed the brakes as described in SECTION 5.
7. Close the internal bleed valves.
TIGHTEN
* Internal bleed valves (A) to 7 N-m (60 lbs.In.).
8. Remove the three J 39177 Combination Valve Pressure Bleeding Tools.
9. Check the master cylinder reservoir fluid level and fill if needed.
10. With the Ignition switch "ON" and the engine off, do six function tests with the Tech-1 scan tool.
11. Repeat the wheel cylinder and caliper bleed procedure as many times as needed to remove the remaining air in the hydraulic system.
12. Apply firm pressure to the brake pedal and evaluate brake pedal feel.
13. Repeat the bleed procedure if needed.
Make sure you have a good, hard brake pedal before starting the engine and moving the vehicle.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.