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 MANUALSCHEVROLET2009COBALT L4-2.2LREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSBRAKES AND TRACTION CONTROLDISC BRAKE SYSTEMBRAKE ROTOR/DISC
2009 Chevrolet Cobalt L4-2.2L
Brake Rotor/Disc
2009 Chevrolet Cobalt L4-2.2LSECTION Brake Rotor/Disc
FRONT BRAKE ROTOR/DISC J41/JM4
Brake Rotor Minimum Allowable Thickness After Refinish 22.75 mm (0.896 in)
Brake Rotor Discard Thickness 22.0 mm (0.87 in)
Brake Rotor Maximum Allowable Thickness Variation 0.025 mm (0.001 in)
Lateral Runout 0.06 mm (0.002 in)
FRONT BRAKE ROTOR/DISC JL9 (With LNF)
Brake Rotor Minimum Allowable Thickness After Refinish 24.2 mm (0.952 in)
Brake Rotor Discard Thickness 24.0 mm (0.945 in)
Brake Rotor Maximum Allowable Thickness Variation 0.025 mm (0.001 in)
Lateral Runout 0.06 mm (0.002 in)
FRONT BRAKE ROTOR/DISC JL9 (Without LNF)
Brake Rotor Minimum Allowable Thickness After Refinish 23.0 mm (0.906 in)
Brake Rotor Discard Thickness 22.8 mm (0.898 in)
Brake Rotor Maximum Allowable Thickness Variation 0.025 mm (0.001 in)
Lateral Runout 0.06 mm (0.002 in)
REAR BRAKE ROTOR/DISC JL9 (With LNF)
Brake Rotor Minimum Allowable Thickness After Refinish 18.2 mm (0.717 in)
Brake Rotor Discard Thickness 18.0 mm (0.709 in)
Brake Rotor Maximum Allowable Thickness Variation 0.025 mm (0.001 in)
Lateral Runout 0.06 mm (0.002 in)
REAR BRAKE ROTOR/DISC JL9 (Without LNF)
Brake Rotor Minimum Allowable Thickness After Refinish 12.0 mm (0.472 in)
Brake Rotor Discard Thickness 11.8 mm (0.465 in)
Brake Rotor Maximum Allowable Thickness Variation 0.025 mm (0.001 in)
Lateral Runout 0.06 mm (0.002 in)
Brake Rotor Minimum Allowable Thickness After Refinish 22.75 mm (0.896 in)
Brake Rotor Discard Thickness 22.0 mm (0.87 in)
Brake Rotor Maximum Allowable Thickness Variation 0.025 mm (0.001 in)
Lateral Runout 0.06 mm (0.002 in)
FRONT BRAKE ROTOR/DISC JL9 (With LNF)
Brake Rotor Minimum Allowable Thickness After Refinish 24.2 mm (0.952 in)
Brake Rotor Discard Thickness 24.0 mm (0.945 in)
Brake Rotor Maximum Allowable Thickness Variation 0.025 mm (0.001 in)
Lateral Runout 0.06 mm (0.002 in)
FRONT BRAKE ROTOR/DISC JL9 (Without LNF)
Brake Rotor Minimum Allowable Thickness After Refinish 23.0 mm (0.906 in)
Brake Rotor Discard Thickness 22.8 mm (0.898 in)
Brake Rotor Maximum Allowable Thickness Variation 0.025 mm (0.001 in)
Lateral Runout 0.06 mm (0.002 in)
REAR BRAKE ROTOR/DISC JL9 (With LNF)
Brake Rotor Minimum Allowable Thickness After Refinish 18.2 mm (0.717 in)
Brake Rotor Discard Thickness 18.0 mm (0.709 in)
Brake Rotor Maximum Allowable Thickness Variation 0.025 mm (0.001 in)
Lateral Runout 0.06 mm (0.002 in)
REAR BRAKE ROTOR/DISC JL9 (Without LNF)
Brake Rotor Minimum Allowable Thickness After Refinish 12.0 mm (0.472 in)
Brake Rotor Discard Thickness 11.8 mm (0.465 in)
Brake Rotor Maximum Allowable Thickness Variation 0.025 mm (0.001 in)
Lateral Runout 0.06 mm (0.002 in)
RENDER: 1.0x
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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.