Chevrolet Sonic Repair Manual: 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 brake cleaner.
- Inspect the braking surface of the brake drum for the following braking
surface conditions:
If the braking surface of the brake drum exhibits one or more of the braking
surface conditions listed, the drum requires refinishing or replacement.
Using a brake drum micrometer calibrated in thousandths-of-an-inch, measure
and record any grooves present on the drum braking surface.
Ensure that the measurements are only taken within the brake shoe lining contact
area.
Compare the groove, or scoring depth recorded to the following specification:
Specification
Brake drum maximum allowable scoring: 0.50 mm (0.020 in)
If the brake drum scoring depth exceeds the specification, or if an excessive
amount of scoring is present, the drum requires refinishing or replacement.
Mount the brake drum on a brake lathe.
Mount a dial indicator, CH-8001 indicator (1), or equivalent, and position
the indicator button so it contacts the braking surface of the brake drum (2) at
a 90 degree angle, approximately 19 mm (0.75 in) from the outer edge of the drum.
Measure and record the radial runout of the brake drum.
- Rotate the drum until the lowest reading is displayed on the indicator dial,
then zero the dial.
- Rotate the drum until the highest reading is displayed on the dial.
Compare the radial runout of the brake drum to the following specification:
Specification
Brake drum maximum allowable radial runout: 0.03 mm (0.001 in)
If the brake drum radial runout exceeds the specification, the drum requires
refinishing or replacement.
Special Tools
CH-41013 Rotor Resurfacing Kit
CH-42450-A Wheel Hub Resurfacing Kit
For equivalent regional tools, refer to Special Tools.
Removal Procedure
Warning: Refer t ...
Warning: Refer to Brake Dust Warning.
Visually inspect the adjuster actuator spring (1) for the following conditions:
Excessive stretching
Excessive bending
Exces ...
Other materials:
If the Vehicle Is Stuck
Slowly and cautiously spin the wheels to free the vehicle when stuck in sand,
mud, ice, or snow.
If stuck too severely for the traction system to free the vehicle, turn the traction
system off and use the rocking method. See Traction Control/Electronic Stability
Control.
Warning
If the vehi ...
Differential Carrier Removal (6T30)
Differential Carrier Removal
Callout
Component Name
1
Differential Carrier Assembly
2
Final Drive Sun Gear
...
Fuel Injector Replacement
Fuel Injector Replacement
Callout
Component Name
Preliminary Procedure
Disconnect battery negative cable. Refer to Battery Negative Cable
Disconnection and Connection.
Remove the fuel injection fuel rail assembly. Refer t ...
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