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 333 (DISC BRAKES)SYMPTOM TESTSBRAKE PULSATION
1999 GMC Forward Control 5.7 R, Automatic
Brake Pulsation
1999 GMC Forward Control 5.7 R, AutomaticSECTION Brake Pulsation
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
- Were you sent here from the Hydraulic Brake Symptom table? If so, go to next step. If not, go to HYDRAULIC BRAKE SYSTEM under TROUBLE SHOOTING.
- Suspension components that are not operating properly may cause a disturbance to the vehicle during application of the brake system. Inspect the suspension system for proper operation. See TROUBLE SHOOTING in appropriate FRONT or REAR article in SUSPENSION. Did you find and correct a condition? If so, go to step 6 . If not, go to next step.
- Anti-lock brake system operation could produce feedback through the brake pedal during application of the brake system. Inspect the anti-lock brake system for proper operation. See appropriate ANTI-LOCK article. Did you find and correct a condition? If so, go to step 6 . If not, go to next step.
- Inspect the disc brake system for proper operation. See DISC BRAKE SYSTEM DIAGNOSIS under SYSTEM TESTS. Did you find and correct a condition? If so, go to step 6 . If not, go to next step.
- Inspect the hydraulic brake system for proper operation. See HYDRAULIC BRAKE SYSTEM DIAGNOSIS under SYSTEM TESTS. Did you find and correct a condition? If so, go to next step. If not, go to DIAGNOSTIC STARTING POINT .
- Road test the vehicle in order to confirm proper operation. See BRAKE SYSTEM VEHICLE ROAD TEST under TROUBLE SHOOTING. Is the condition still present? If so, go to step 2 . If not, system is okay.
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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.