C 2500 Truck 2WD V6-262 4.3L VIN Z (1992)
5.
Attach the valve pressure bleeding tools J39177 to the left and right high pressure accumulator bleed valve stems of the BPMV (figure 3) and to
the combination valve (figure 4). Tighten tool J39177 only finger tight.
6.
Open the pressure bleeder tank valve.
7.
Bleed each wheel in the following sequence:
- Right rear
- Left rear
- Right front
- Left front
NOTE:
Rear wheel bleeder valves are 5/16 in. (8 mm) and front wheel bleeder valves are 10 mm.
NOTE:
A clear plastic hose can be attached to the bleeder valve and immersed into a container partially filled with clean brake fluid.
8.
Open the bleeder valve at least 3/4 of a turn and allow the fluid to flow until no air is seen in the fluid. Tighten the bleeder valve.
9.
Repeat step 7 and 8 at each wheel cylinder/caliper until all the air is purged.
10.
Disconnect the bleeder tank hose from the bleeder adaptor and remove the bleeder adaptor.
11.
Fill the master cylinder to the proper level and replace lid.
12.
CLOSE and tighten the two BPMV internal bleed screws (Figure 2) to 7 N-m (60 lbs.in.).
13.
Remove the valve pressure bleeding tools J39177 from the BPMV high pressure accumulator bleed valve stems and the combination valve.
14.
With the ignition switch "ON" and the engine off, bleed the pump and pressure (lower) portion of the BPMV by performing six ABS function tests
with the Tech-1.
IMPORTANT:
DURING THE TECH-1 FUNCTION TESTS, THE BRAKE PEDAL MUST BE FIRMLY DEPRESSED. THIS WILL PUSH ANY AIR FROM
THE CONTROL AREA OF THE BPMV INTO THE BRAKE SYSTEM.
15.
Finally, rebleed the four wheel cylinder/calipers again, to purge any remaining air put into the system during the function tests. Use either the
pressure bleed or manual bleed for this step.
IMPORTANT:
DO NOT OPEN THE BPMV INTERNAL BLEED SCREWS OR DEPRESS THE HIGH PRESSURE ACCUMULATOR BLEED VALVES
WHEN REBLEEDING AFTER THE FUNCTION TESTS.
16.
Tighten all four wheel cylinder/caliper bleeder valves to 7 N-m (60 lbs.in.).
17.
Remove the bleeder adaptor, if using the pressure bleed procedure (figure 1), and fill the master cylinder to the proper level with brake fluid.
18.
Apply firm pressure to the brake pedal and evaluate the brake pedal feel.
IMPORTANT:
MAKE SURE YOU HAVE A GOOD, HARD BRAKE PEDAL BEFORE ATTEMPTING TO MOVE THE VEHICLE.
19.
Repeat the entire brake bleed procedure if necessary.
Manual Bleed Procedure
When a pressure bleeder is not available, use the (two person) manual bleed procedure. One person will push on the brake pedal while the other person
will open and close the bleed valves.
IMPORTANT:
You can expect to use two quarts of brake fluid to thoroughly bleed the system.
