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 MANUALSCHEVROLET1980FORWARD CONTROL 5.7L ENG VIN M, AUTOMATIC TRANS, TRANS MFR CD 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESMECHANICAL - HYDRAULICBRAKE SYSTEMS - SLIDING CALIPER DISCSOVERHAULDISC ROTORPARALLELISM
1980 Chevrolet Forward Control 5.7L Eng VIN M, Automatic Trans, Trans Mfr CD 400/M40
Disc Rotor: Parallelism
1980 Chevrolet Forward Control 5.7L Eng VIN M, Automatic Trans, Trans Mfr CD 400/M40SECTION Parallelism
Check thickness of rotor at four or more points around circumference of rotor. Make all measurements at same distance from edge of rotor. If thickness variation is excessive, refinish or replace rotor as necessary.
TIGHTENING SPECIFICATIONS
| Application | Ft. Lbs. |
| Brake-to-Caliper | 32 |
| Support Key Retaining Screw | 18 |
| Caliper Mounting Bolts | 35 |
| Application | Inch Lbs. |
| Hydraulic Line-to-Brake Hose | 150 |
| Bleeder Valve Screws | 60 |
DISC BRAKE ROTOR SPECIFICATIONS
| Application | Disc Diameter | Lateral Runout | Parallelism | Original Thickness | Minimum Refinish Thickness | Discard Thickness | |||
|---|---|---|---|---|---|---|---|---|---|
| Diesel Engine Models | 11.86" | .004" | .0005" | 1.28" | 1.230" | 1.215" | |||
| All Others | |||||||||
| Front (Drum Rear) | 12.50" | .004" | .0005" | 1.530" | 1.480" | 1.465" | |||
| Front (Disc Rear) | 14.25" | .004" | .0005" | 1.530" | 1.480" | 1.465" | |||
| Rear (1) | 13.75" | .004" | .0005" | 1.530" | 1.480" | 1.465" | |||
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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.