G 20 Van V6-262 4.3L VIN Z (1993)
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Right rear
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Left rear
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Right front
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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.
4.
Slowly apply the brake pedal one time and hold.
5.
Loosen the bleeder valve to purge the air from the wheel cylinder/caliper.
6.
Tighten the bleeder valve and slowly release the pedal.
7.
Wait 15 seconds.
8.
Be sure to check the master cylinder fluid level after 4-5 strokes to avoid running dry.
9.
Repeat steps 4 through 8, until all air is purged from the wheel cylinder/caliper.
Note:
It may be necessary to repeat this sequence as many as 15 to 20 times per wheel.
10.
Fill the master cylinder to the proper level and replace lid.
11.
CLOSE and tighten the two BPMV internal bleed screws (Figure 2) to 7 N-m (60 lbs.in.).
12.
Remove the valve pressure bleeding tools J 39177 from the BPMV high pressure accumulator bleed valve stems and the combination valve.
13.
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.
14.
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.
15.
Tighten all four wheel cylinder/caliper bleeder valves to 7 N-m (60 lbs. in.).
16.
Fill the master cylinder to the proper level with brake fluid.
17.
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.
18.
Repeat the entire brake bleed procedure if necessary.
WARRANTY INFORMATION
For vehicles repaired under warranty, use:
Labor Operation: H0700
Labor Time: See applicable labor time guide
Note:
When performing the 4WAL brake system bleeding procedure. the ignition switch must be in the "OFF" position or false diagnostic trouble codes could
be set to memory. If trouble codes are set, refer to Section 5E1 "Clearing Diagnostic Trouble Codes" in the 1993 Service Manual.
PRESSURE BLEED PROCEDURE
