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 MANUALSCHEVROLET2007HHR L4-2.4LREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSBRAKES AND TRACTION CONTROLSYSTEM SPECIFICATIONSDRUM BRAKE COMPONENT SPECIFICATIONS
2007 Chevrolet HHR L4-2.4L
Drum Brake Component Specifications
2007 Chevrolet HHR L4-2.4LSECTION Drum Brake Component Specifications
Brake Drum Discard Diameter 231.0 mm 9.094 in
Brake Drum Diameter - New 230.125 mm � 0.125 mm 9.06 in � 0.005 in
Brake Drum Maximum Allowable Radial Runout 0.104 mm 0.004 in
Brake Drum Maximum Allowable Scoring 1.5 mm 0.059 in
Brake Drum Maximum Diameter After Refinish 230.50 mm 9.075 in
Brake Drum Diameter - New 230.125 mm � 0.125 mm 9.06 in � 0.005 in
Brake Drum Maximum Allowable Radial Runout 0.104 mm 0.004 in
Brake Drum Maximum Allowable Scoring 1.5 mm 0.059 in
Brake Drum Maximum Diameter After Refinish 230.50 mm 9.075 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.