Front disk brakes not releasing

Hi,

I need you to try something. Lift one of the front wheels from the ground safely. Turn the wheel. If it turns, have a helper apply the brakes so it locks up again. When the brake is released and the wheel won't turn, open the bleeder on the brake caliper.

If that releases the wheel, chances are the rubber brake hose has failed. They can break down internally and not allow pressure to release.

Let me know if this is something that has happened all at once or if there has been problems.

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Here are directions for replacement of the hose I'm referring to. The attached pictures correlate with the directions.

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2006 GMC Truck Sierra 1500 2WD V8-5.3L VIN B HO
Brake Hose Replacement - Front
Vehicle Brakes and Traction Control Hydraulic System Brake Hose/Line Service and Repair Procedures Brake Hose Replacement - Front
BRAKE HOSE REPLACEMENT - FRONT
Brake Hose Replacement - Front
Removal Procedure

Caution: Refer to Brake Fluid Irritant Caution in Service Precautions.

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

1. Raise and suitably support the vehicle.
2. Remove the tire and wheel assembly.
3. Clean all dirt and foreign material from the brake hose and brake pipe fittings.

Pic 1

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

Use a backup wrench on the hose fitting, disconnect the brake pipe fitting from the brake hose, then cap or plug the brake pipe fitting end.
5. Remove the brake hose retaining clip from the hose mounting bracket.
6. Remove the brake hose bolt and the bracket from the upper control arm.
7. Remove the brake hose bolt and the bracket from the steering knuckle.

Pic 2

8. Remove the brake hose to caliper bolt from the brake caliper.
9. Remove the brake hose from the brake caliper.
10. Remove and discard the 2 copper brake hose gaskets. These gaskets may be stuck to the brake caliper housing or the brake hose end.

Installation Procedure

pic 3

1. Important: Install 2 new copper brake hose gaskets.

Assemble the 2 new copper brake hose gaskets, and the brake hose bolt to the brake hose.

2. Notice: Refer to Fastener Notice in Service Precautions.

Install the brake hose to caliper bolt and 2 new washers to the brake caliper.
Tighten the bolt to 40 Nm (30 ft. Lbs.).

3. Important: The hose must not be twisted. Make sure the hose is not in contact with any suspension component.

With the weight of the vehicle on the suspension, install the brake hose into the bracket.

Pic 4

4. Install the brake hose bolt and the bracket to the steering knuckle.
Tighten the bolt to 9 Nm (80 inch lbs.).
5. Install the brake hose bolt and the bracket to the upper control arm.
Tighten the bolt to 9 Nm (80 inch lbs.).
6. Install the brake hose retaining clip.
7. Remove the rubber cap or plug from the exposed brake pipe fitting end.
8. Connect the brake pipe fitting nut to the brake hose:
Use a backup wrench on the hose fitting.
Do not bend the bracket or the pipe.
Tighten the bolt to 25 Nm (18 ft. Lbs.).
9. Bleed the hydraulic brake system.
10. Install the tire and wheel assembly.
11. Ensure that the hose does not make contact with any part of the suspension or the wheel. Check the hose in extreme right and left turn conditions. If the hose makes contact, remove the hose and correct the condition.
12. Lower the vehicle.

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Let me know what you find. Also, if this doesn't help, let me know if you have a traditional vacuum boost brake system assist or if it is a hydro-static. If any other work has recently been done, let me know that as well. For example, if the master cylinder has been replaced.

Take care,

Joe