Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 595 (DRUM BRAKE SYSTEM)REPAIR INSTRUCTIONSWHEEL CYLINDER REPLACEMENTINSTALLATION PROCEDURE

1999 GMC Forward Control 5.7 R, Automatic

Installation Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation Procedure

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

Apply LOCTITE® GM P/N 12345382 (or equivalent) to the wheel cylinder shoulder face which contacts the backing plate.

Fig 1: Using J 38400 To Spread The Brake Shoes Apart

Courtesy of GENERAL MOTORS CORP.

Use the J 38400 in order to spread the brake shoes apart (1). See Special Tools and Equipment .

Fig 2: Removing/Installing Wheel Cylinder

Courtesy of GENERAL MOTORS CORP.

Install the wheel cylinder.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the wheel cylinder bolts (2).
Tighten: Tighten the bolts to 12 N.m (110 lb in).
Remove the cap from the brake pipe and install the brake pipe to the wheel cylinder.
Tighten: Tighten the nut to 17 N.m (12 lb ft).
Install the brake drum. Refer to Brake Drum Replacement .
Bleed the hydraulic brake system at the wheel cylinder. Refer to Hydraulic Brake System Bleeding (Manual) or Hydraulic Brake System Bleeding (Pressure) in Hydraulic Brakes.
Install the tire and wheel. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
Lower the vehicle.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.