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 299 (COMMON SPECS & PROCEDURES)BRAKESDISC BRAKESDISC BRAKE SERVICE SPECIFICATIONS
1999 GMC Forward Control 5.7 R, Automatic
Disc Brake Service Specifications
1999 GMC Forward Control 5.7 R, AutomaticSECTION Disc Brake Service Specifications
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
DISC BRAKE SERVICE SPECIFICATIONS
| Application | In. (mm) | ||||
|---|---|---|---|---|---|
| JC1 (Vehicles Equipped W/Front & Rear Disc Brakes) | |||||
| Front Disc | |||||
| Rotor Discard Thickness (1) | 1.08 (27.5) | ||||
| Rotor Thickness - NEW | 1.14 (29.0) | ||||
| Rotor Maximum Allowable Lateral Runout | 0.002 (0.051) | ||||
| Rotor Maximum Allowable Scoring | 0.059 (1.5) | ||||
| Rotor Maximum Allowable Thickness Variation | 0.001 (0.025) | ||||
| Rear Disc | |||||
| Rotor Discard Thickness (1) | 0.728 (18.50) | ||||
| Rotor Minimum Allowable Thickness After Refinish | 0.748 (19.00) | ||||
| Rotor Thickness - NEW | 0.787 (20.0) | ||||
| Rotor Maximum Allowable Lateral Runout | 0.002 (0.051) | ||||
| Rotor Maximum Allowable Scoring | 0.059 (1.50) | ||||
| Rotor Maximum Allowable Thickness Variation | 0.001 (0.025) | ||||
| JM3 (Vehicles Equipped W/Front Disc Brakes & Rear Drum Brakes) | |||||
| Front Disc | |||||
| Rotor Discard Thickness (1) | 0.965 (24.51) | ||||
| Rotor Minimum Allowable Thickness After Refinish | 0.980 (24.89) | ||||
| Rotor Thickness - NEW | 1.03 (26.2) | ||||
| Rotor Maximum Allowable Lateral Runout | 0.002 (0.051) | ||||
| Rotor Maximum Allowable Scoring | 0.059 (1.50) | ||||
| Rotor Maximum Allowable Thickness Variation | 0.001 (0.025) | ||||
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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.