Replace the brake Master?

Hi,

Replacing the master cylinder isn't too hard to do. First, here is a link that shows it being done:

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

Here are the directions specific to your vehicle. The attached pics correlate with the directions.

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2004 Chevy Truck Blazer 4WD V6-4.3L VIN X
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

Removal Procedure

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

1. Apply the parking brake and block the wheels.
2. Disconnect the brake pipes from the master cylinder.

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

pic 1

3. Plug the open brake pipe ends.

pic 2

4. Remove the master cylinder nuts and bolts.
5. Remove the master cylinder from the vehicle.
6. Drain the master cylinder reservoir of all the brake fluid.

Installation Procedure

pic 3

1. Bench bleed the master cylinder.

pic 4

2. Install the master cylinder to the vehicle.

Notice: Refer to Fastener Notice in Service Precautions.

3. Install the master cylinder bolts and nuts.
Tighten the nuts to 36 Nm (27 ft. lbs.).

pic 5

4. Connect the brake pipes to the master cylinder.
Tighten the pipe nuts to 30 Nm (22 ft. lbs.).
5. Bleed the hydraulic brake system.

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I hope this helps. Let me know if you have other questions.

Take care and God Bless,

Joe