Grand AM L4-138 2.3L VIN A MFI (1992)
Brake Bleeding: Service and Repair
With ABS System
Before bleeding the rear brakes, the rear displacement cylinder pistons must be returned to their top most position. Using a TECH 1 scan
tool or suitable equivalent, enter the manual control function and ``APPLY'' the rear motor. Ensure the enable relay is ``ON.'' If a scan tool is
not available, bleed the front brakes to ensure that a firm brake pedal exists, then carefully drive vehicle over 4 mph to cause the ABS to
initialize itself. This will return the rear displacement cylinder to the top position. The entire brake system should now be rebled.
Pressure Bleeding
To prevent air, moisture and other contaminants from entering system, only diaphragm type pressure bleeding equipment should be used.
1.
Attach bleeder adapter tool J35589 or equivalent to master cylinder reservoir, then the adapter tool to the pressure bleeder.
2.
Connect a clear plastic hose to the front bleeder valve on the control assembly, then put opposite end of the hose into a clean container partially
filled with brake fluid.
3.
Set pressure bleeder to 5-10 psi and wait for approximately 30 seconds to insure there is no leakage.
4.
Set pressure bleed equipment to 30-35 psi.
5.
Slowly open bleeder valve and allow fluid to flow into container until no air bubbles are seen in fluid, then close the bleeder valve and
torque to
65 inch. lbs.
6.
Attach bleeder hose to rear bleeder valve of the control assembly and repeat step 5.
7.
Position a cloth under hydraulic brake pipe connections.
8.
Working from front of the control assembly to the rear, slowly turn each pipe nut and check for air in escaping fluid.
9.
When air flow ceases,
torque pipe nut to 13 ft. lbs.
10.
Raise and support vehicle, then bleed wheel cylinders and calipers using the following sequence:
a. Right rear.
b. Left rear.
c. Right front.
d. Left front.
11.
Lower vehicle and remove bleeder adapter tool from master cylinder.
12.
Check fluid level in reservoir, fill as necessary.
13.
Turn on ignition and note pedal travel and feel as follows:
a. If pedal feels firm and constant, start the engine and recheck pedal travel, if pedal still feels firm and constant, proceed to step 14.
b. If pedal feels soft or has excessive travel either initially or after engine is started, repeat bleeding procedure.
14.
Road test vehicle, make several normal stops from a moderate speed, then make one or two ABS stops at approximately 50 mph.
15.
Ensure pedal is still firm and constant.
Manual Bleeding
1.
Remove master cylinder reservoir cover, then fill reservoir as necessary.
2.
Attach one end of a clear plastic hose to rear bleeder valve of the brake control assembly, then put opposite end of the hose into a clean container.
3.
While depressing brake pedal, slowly open bleeder valve, until fluid begins to flow.
4.
Close valve and release brake pedal, then repeat procedure for front bleeder valve.
5.
Ensure master cylinder is full, then raise and support vehicle.
6.
Bleed wheel cylinders and calipers using the following sequence:
a. Right rear.
b. Left rear.
c. Right front.
d. Left front.
7.
Lower vehicle and check fluid level in reservoir, fill as necessary.
8.
Turn on ignition and note pedal travel and feel as follows:
a. If pedal feels firm and constant, start the engine and recheck pedal travel, if pedal still feels firm and constant, proceed to step 14.
b. If pedal feels soft or has excessive travel either initially or after engine is started, repeat bleeding procedure.
9.
Road test vehicle, make several normal stops from a moderate speed, then make one or two ABS stops at approximately 50 mph.
10.
Ensure pedal is still firm and constant.
