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 10 (ANTI-LOCK BRAKE SYSTEM - DIESEL)BLEEDING BRAKE SYSTEMBRAKE PRESSURE MODULATOR VALVEMANUAL BLEEDING
1999 GMC Forward Control 5.7 R, Automatic
Manual Bleeding
1999 GMC Forward Control 5.7 R, AutomaticSECTION Manual Bleeding
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 1996 GMC Vandura Special, 1996 GMC Vandura, 1996 GMC Savana Special, 1996 GMC Savana Camper Special, and 1996 GMC Savana. However, it is still accessible from the selected car via links, so may be relevant.
- Raise and support vehicle. Begin by bleeding the right rear wheel, then the left rear, right front and left front. Attach one end of clear tube over valve and submerge other end in container partially filled with clean brake fluid.
- Loosen bleeder valve 1/2 - 1 turn. Have an assistant depress brake pedal slowly and hold. Tighten bleeder valve and slowly release brake pedal. Wait 10-15 seconds. Repeat sequence, including 15 second wait, until one pint of fluid has been bled from wheel.
- Remove tube and wrench. Repeat step 2) at left rear, right front, and left front wheels in this order. Clean brake fluid should be present at each wheel bleed screw. Check master cylinder fluid level every 4-6 strokes of brake pedal to avoid ingesting air into system.
- If any component was replaced causing air to enter the BPMV, connect Tech 1 scan tool with RWAL/4WAL cartridge or Mass Storage Cartridge to Data Link Connector (DLC). Using Tech 1 scan tool, perform 4 functional tests while firmly applying brake pedal.
- Fill master cylinder reservoir, and install cover. Ensure there is no sponginess in brake pedal and that BRAKE warning light is off. Rebleed wheel cylinders/calipers to remove the remaining air in brake system. Evaluate brake pedal feel and braking performance. Repeat bleeding procedure if necessary.
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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.