Bleeding brakes is not working?

Hi,

If the brake pedal goes to the floor, first make sure there are no hydraulic leaks in the brake system. Make sure the brake fluid reservoir is full. If it is, chances are the brake master cylinder is bad. Here are the master cylinder installation instruction you have requested. Here is a guide to help you step by step with instructions in the diagrams below to show you how on your car.

https://youtu.be/WDxvEQrMkBg

and

https://youtu.be/w7gUsj2us0U

and

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

If you find the master cylinder is bad, replacing it isn't too hard of a job. When you get the replacement part, make sure it has a lifetime warranty. That way, you'll never have to pay for it again. First, here is a link that shows how in general one is replaced. You can use this as a guide.The new brake master cylinder will need bench bled before install. Here are directions specific to your vehicle. The attached pics below correlate with the directions.

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2006 Chevy Truck Tahoe 4WD V8-5.3L VIN T
Master Cylinder Replacement
Vehicle Brakes and Traction Control Hydraulic System Brake Master Cylinder Service and Repair Procedures Master Cylinder Replacement
MASTER CYLINDER REPLACEMENT
Master Cylinder Replacement

Caution: Refer to Brake Fluid Irritant in Service Precautions.

Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in Service Precautions.

Removal Procedure
1. Apply the park brake and block the wheels.

2. Disconnect the electrical connector from the brake fluid level sensor.

Important: Install a rubber cap or plug to the exposed brake pipe fitting ends in order to prevent brake fluid loss and contamination.

3. Disconnect the brake pipes from the master cylinder.
4. Plug the open brake pipe ends.

5. Remove the master cylinder mounting nuts.
6. Remove the master cylinder from the vehicle.
7. Remove the master cylinder reservoir. Refer to Master Cylinder Reservoir Replacement.

Installation Procedure
1. Install the master cylinder reservoir. Refer to Master Cylinder Reservoir Replacement.
2. Bench bleed the master cylinder. Refer to Master Cylinder Bench Bleeding.
3. Install the master cylinder to the vehicle.

Notice: Refer to Fastener Notice in Service Precautions.

4. Install the master cylinder mounting nuts.
Tighten the nuts to 33 Nm (24 ft. lbs.).

5. Remove the rubber cap or plug from the exposed brake pipe fitting ends.
6. Connect the brake pipes.
Tighten the pipe fittings to 25 Nm (18 ft. lbs.).
7. Connect the electrical connector to the brake fluid level sensor.
8. Bleed the hydraulic brake system Refer to Hydraulic Brake System Bleeding (Manual) or Hydraulic Brake System Bleeding (Pressure).
9. Release the park brake and unblock the wheels.

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I hope this helps. Let me know if you have other questions. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.