C 2500 Suburban 2WD V8-350 5.7L (1994)
7. Bleed wheel cylinder and calipers.
8. Turn ignition key to On position, then perform 3 function test with TECH 1 scanner.
9. Check brake pedal feel and braking performance; repeat procedure if required.
Rear Wheel Anti-Lock Brake System
The ignition switch must be in the Off position or false diagnostic trouble codes may be set to memory.
1. Install bleeding tool No. J-39177, or equivalent, on combination valve.
2. Check master cylinder reservoir fluid level and fill if necessary.
3. Relieve vacuum reserve by pumping brakes several times.
4. Fill master cylinder reservoirs with suitable DOT 3 brake fluid. Maintain fluid level during bleeding.
5. If master cylinder is suspected to have air in the bore, bleed it before any wheel cylinder or caliper as follows:
a. Disconnect forward brake pipe connection at master cylinder and allow brake fluid to flow from connector port.
b. Connect brake pipe but do not tighten.
c. Slowly apply brake pedal and allow air to bleed from loose fitting, then tighten fitting before releasing pedal.
d. Wait 15 seconds.
e. Repeat this sequence until all air is purged from master cylinder bore.
f.
Repeat procedure for rear pipe.
6. Bleed each wheel in the following sequence:
a. Right rear.
b. Left rear.
c. Right front.
d. Left front.
7. Attach tool No. J-28434, or equivalent, to wheel cylinder/caliper bleeder valve. Immerse opposite end of hose into suitable container partially
filled with brake fluid.
8. Slowly apply brake pedal one time and hold.
9. Loosen bleeder valve to purge air from wheel cylinder/caliper.
10. Tighten bleeder valve and slowly release pedal.
11. Wait 15 seconds.
12. Repeat sequence until all air is purged from wheel cylinder/caliper.
13. Torque bleeder valve to 62 inch lbs.
14. Perform preceding bleed steps at each wheel until system is bled.
15. Check brake pedal for sponginess and the brake warning lamp for indication of unbalanced pressure. Repeat bleeding procedure to correct either
condition.
Pressure Bleeding
Brake fluid will damage electrical connections and painted surfaces. Use shop cloths and fender covers to prevent fluid from contacting these
areas.
1. Fill pressure tank at least 2/3 full of brake fluid.
2. Charge bleeder to 20-25 psi.
3. Use tool No. J-39177, or equivalent, to depress and hold valve stem on combination valve.
4. Install bleeder adapter.
5. Bleed each wheel in following sequence:
a. Right rear.
b. Left rear.
c. Right Front.
d. Left front.
6. Connect the hose from bleeder to adapter at the master cylinder.
7. Open tank valve.
8. Attach tool No. J-28434, or equivalent, to a bleeder valve.
9. immerse opposite end of hose into container partially filled with clean brake fluid.
10. Open bleeder valve at least 3/4 of a turn and allow fluid to flow until no air is seen in the fluid.
11. Torque bleeder valve to 62 inch lbs.
12. Repeat preceding bleed steps at all wheels.
13. Check brake pedal for sponginess. Repeat bleeding procedure to correct this condition.
14. Remove tool used to hold combination valve stem.
15. Disconnect hose from bleeder adapter.
16. Fill master cylinder to proper fluid level.
17. Turn ignition switch to On position and perform three function tests.
18. Evaluate pedal feel. Repeat bleed procedure if necessary.
General Information
The braking system can be bled manually or with pressure bleeding equipment. If bleeding manually, check fluid level frequently.
Brake fluid should never be reused. Before driving the vehicle, check brake operation to ensure a firm pedal has been obtained.
