Chevrolet Sonic Repair Manual: Brake Rotor Surface and Wear Inspection

Chevrolet Sonic Repair Manual / Chassis / Brakes / Disc Brakes / Brake Rotors / Brake Rotor Surface and Wear Inspection

Warning:

Refer to Brake Dust Warning.

If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. Refer to Front Disc Brake Pads Replacement.
Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.
Inspect the friction surfaces of the brake rotor for the following braking surface conditions:

Heavy rust and/or pitting
Light surface rust can be removed with an abrasive disc. Heavy surface rust and/or pitting must be removed by refinishing the brake rotor.
Cracks and/or heat spots
Too much blueing discoloration

If the friction surfaces of the brake rotor exhibit one or more of the braking surface conditions, the brake rotor requires refinishing or replacement.

Using a micrometer (1) calibrated in thousandths-of-a-millimeter, or ten-thousandths-of-an-inch, measure and record the scoring depth of any grooves present on the brake rotor friction surfaces.

Compare the groove scoring depth recorded to the following specification: Specification

Brake rotor maximum allowable scoring: 1.50 mm (0.059 in) .

If the brake disc rotor scoring depth exceeds the specification, or if an excessive amount of scoring is present, the brake rotor requires refinishing or replacement.

Brake Rotor Refinishing

Special Tools CH-41013 Rotor Resurfacing Kit CH-42450-A Wheel Hub Resurfacing Kit For equivalent regional tools, refer to Special Tools. Warning: Refer to Brake Dust Warning. Note ...

Brake Rotor Thickness Measurement

Warning: Refer to Brake Dust Warning. If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. Refer to Front Disc Bra ...

Other materials:

If the Off Indicator Is Lit for an Adult-Size Occupant
If a person of adult size is sitting in the front outboard passenger seat, but the off indicator is lit, it could be because that person is not sitting properly in the seat. Use the following steps to allow the system to detect that person and enable the front outboard passenger frontal airb ...

Brake Drum Surface and Wear Inspection
Special Tools CH-8001 Dial Indicator Set For equivalent regional tools, refer to Special Tools. Warning: Refer to Brake Dust Warning. With the brake drum removed, clean the brake shoe lining contact surface of the brake drum with denatured alcohol or an equivalent approved brak ...

P-Metric Sized Tires Description
245/50r16953typeloadindep-passengerttemporarylt-lighttruckspeedsymbolsectionwidth(millimeters)235245275construction(sectionwidth)ddagonal(bas)40sectionwidthsectionheight Replacement tires should be of the same tire performance criteria (TPC) specification number. This will ensure the same size, ...

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