Brakes not bleeding issue

Welcome to 2CarPros.

I'm not sure if you are bleeding all brakes or just one wheel. Also, what was done to the vehicle to require bleeding, a brake line, hose, master cylinder, wheel cylinder, caliper?

If you could provide that info, it would be helpful. However, I am going to give you directions for several different conditions. I will label each. Some will be for manual bleeding and the others vacuum.

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This is for manual bleeding / all wheels

NOTE: Bleeding is necessary if air has entered the hydraulic brake system.

It may be necessary to bleed the system at all four wheels if a low fluid level allowed air to enter the system, or the brake pipes have been disconnected at the master cylinder or combination valve. If a pipe is disconnected at one wheel, then only bleed that wheel.

The time required to bleed the hydraulic system when the master cylinder is removed can be reduced by bleeding the master cylinder before installing it on the vehicle. If the brake pressure modulator valve (BPMV) has been replaced or has air trapped in it, refer to Antilock Brake System.

NOTE: Brake fluid will damage electrical connections and painted surfaces. Use shop cloths, suitable containers, and fender covers to prevent brake fluid from contacting these areas. Always reseal and wipe off brake fluid containers to prevent spills.

Tool Required:
J 28434 Wheel Cylinder Bleeder Wrench

NOTE: Relieve the vacuum reserve by applying the brakes several times with the ignition "OFF."

1. Fill the master cylinder reservoirs with Delco Supreme No. 11 Hydraulic Brake Fluid GM G/M 1052535 or an equivalent DOT 3 motor vehicle brake fluid.
Maintain the fluid level during bleeding.
2. If the master cylinder is suspected to have air in the bore, bleed it before any wheel cylinder or caliper.
A. Disconnect the forward brake pipe connection at the master cylinder.
B. Allow the brake fluid to flow from the connector port.
C. Connect the brake pipe but do not tighten.
D. Slowly apply the brake pedal and allow the air to bleed from the loose fitting.
E. Tighten the fitting before releasing the pedal.
F. Wait 15 seconds.
G. Repeat this sequence, including the 15 second wait, until all air is purged from the bore.
H. After all air has been removed from the forward connection, repeat this procedure for the rear pipe.
3. If the BPMV is replaced or suspected to have air trapped inside, it must be bled next. Refer AntiLock Brake System.
4. Bleed each wheel in the following sequence:
A. Right rear
B. Left rear
C. Right front
D. Left front
5. Attach J 28434 to the wheel cylinder/caliper bleeder valve.
Immerse the opposite end of the hose into a container partially filled with clean brake fluid.
6. Slowly apply the brake pedal one time and hold.
7. Loosen the bleeder valve to purge the air from the wheel cylinder/caliper.
8. Tighten the bleeder valve and slowly release the pedal.
9. Wait 15 seconds.
10. Repeat this sequence, including the 15 second wait, until all air is purged from the wheel cylinder/caliper.
11. Tighten the bleeder valve to 7 Nm (62 inch lbs.).
12. Continue Steps 5 through 11 at each wheel until the system is bled.
13. Check the brake pedal for "sponginess" and the brake warning lamp for an indication of unbalanced pressure. Repeat the bleeding procedure to correct either of these conditions.

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ABS Bleeding

WHEEL BLEEDING
ANTILOCK BRAKE SYSTEM (ABS) BLEEDING PROCEDURE

NOTE:
The two person bleed procedure is required when installing a new electro-hydraulic control unit, or when air is suspected to be trapped in the valve body.
Do not run the Function Test after combination valve or tube adapter replacement.
Do not drive the vehicle until brake pedal feel is firm.
Do not re-use brake fluid used during bleeding.
Vacuum, pressure, or gravity bleeding may be used for base brake bleeding only.

Two Person ABS Bleeding Procedure
1. Raise the vehicle to gain access to the system bleed screws.
2. Begin by bleeding the system at the right rear wheel.
3. Install clear hose on the bleed screw. Immerse the opposite end of the hose into a container partially filled with clean DOT 3 brake fluid.
4. Open the bleed screw 1/2 to 1 full turn.
5. Slowly depress the brake pedal until it reaches its full travel and hold until the bleed screw has been tightened. Release the brake pedal and wait 10-15 seconds for the master cylinder pistons to turn to the home position. Repeat until clean, air free brake fluid is present at the wheel bleed screw. This procedure may use more than a pint of fluid per wheel. Check the master cylinder fluid-level every 4 to 6 strokes of the brake pedal to avoid running the system dry. Repeat steps 3 though 5 on the left rear, then right front, then left front.
6. Use the scan, sod. To run Function Test four time consecutively while applying the brake pedal firmly. Remove foot from:the brake pedal between each test.
7. Rebleed all four wheels using steps 3 through 5 to remove the remaining air from the brake system.
8. Evaluate the brake pedal feel before attempting to drive the vehicle and re-bleed as many times as necessary to obtain appropriate pedal feel.

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Pressure Bleeding - The two attached pics correlate with these directions.

PRESSURE BLEEDING
NOTE: Bleeding is necessary if air has entered the hydraulic brake system.

It may be necessary to bleed the system at all four wheels if a low fluid level allowed air to enter the system, or the brake pipes have been disconnected at the master cylinder or combination valve. If a pipe is disconnected at one wheel, then only bleed that wheel.

The time required to bleed the hydraulic system when the master cylinder is removed can be reduced by bleeding the master cylinder before installing it on the vehicle. If the brake pressure modulator valve (BPMV) has been replaced or has air trapped in it, refer to Antilock Brake System, Service and Repair.

NOTE: Brake fluid will damage electrical connections and painted surfaces. Use shop cloths, suitable containers, and fender covers to prevent brake fluid from contacting these areas. Always reseal and wipe off brake fluid containers to prevent spills.

A Diaphragm-Type Pressure Bleeder - must be used. It must have a rubber diaphragm between the air supply and brake fluid to prevent air, moisture, oil, and other contaminants from entering the hydraulic system.

NOTE: Brake fluid will damage electrical connections and painted surfaces. Use shop cloths, suitable containers, and fender covers to prevent brake fluid from, contacting these areas. Always re-seal and wipe off brake fluid containers to prevent spills.

Tools Required:
J 29567 Brake Bleeder Adapter
J 39177 Combination Valve Pressure Bleeding Tool
J 28434 Wheel Cylinder Bleeder Wrench

1. Fill the pressure tank at least 2/3 full of brake fluid.
The bleeder must be bled each time fluid is added.
2. Charge the bleeder to 140-170 kPa (20-25 psi).

Combination Valve Pressure Bleeding Tool
imageOpen In New TabZoom/Print

3. Use J 39177 to depress and hold the valve stem on the combination valve.

ImageOpen In New TabZoom/Print

4. Install the bleeder adapter.
5. If the BPMV is replaced or suspected to have air trapped inside, it must be bled next.
6. Bleed each wheel in the following sequence:
A. Right rear
B. Left rear
C. Right front
D. Left front

7. Connect the hose from the bleeder to the adapter at the master cylinder.
8. Open the tank valve.
9. Attach J 28434 to a bleeder valve.
10. Immerse the opposite end of the hose into a container partially filled with clean brake fluid.
11. Slowly open bleeder valve at least 3/4 of a turn and allow the fluid to flow until no air is seen in the fluid.
12. Tighten the bleeder valve to 7 Nm (62 inch lbs.).
13. Repeat Steps 9 through 12 at all the wheels
14. Check the brake pedal for "sponginess." Repeat the bleeding procedure if this condition is found.
15. Remove J 39177.
16. Disconnect the hose from the bleeder adapter.
17. Remove the bleeder adapter.
18. Fill the master cylinder to the proper level.

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Please keep in mind, if you are getting nothing at the wheels, you may have a bad master cylinder. Let me know what is happening so I can better help.

Take care,
Joe