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 MANUALSCHEVROLET1989SUBURBAN 1/2 TON 2WD V8-454 7.4LREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSBRAKE ROTOR/DISC
1989 Chevrolet Suburban 1/2 Ton 2WD V8-454 7.4L
Brake Rotor/Disc
1989 Chevrolet Suburban 1/2 Ton 2WD V8-454 7.4LSECTION Brake Rotor/Disc
Rotor Thickness
GM brake systems are identified by Regular Production Option (RPO) codes. For further information on RPO codes see Application and ID.
GM brake systems are identified by Regular Production Option (RPO) codes. For further information on RPO codes see Application and ID.
| RPO JB3, JB5, JB6, JB7, JD3, JD5, JD6, JD7 | RPO JB8, JB9, JF9 | |
| Nominal Thickness | 1.28 Inch (in) | 1.53 Inch (in) |
| Minimum Refinish Thickness | 1.23 Inch (in) | 1.48 Inch (in) |
| Discard Thickness | 1.215 Inch (in) | 1.465 Inch (in) |
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.