Chevrolet Trax: Brake pad inspection
Fig. 7: Disc Brake Pads And Audible Wear Sensors
WARNING: Refer to Brake Dust Warning .
- Inspect the disc brake pads at regular intervals, or whenever the tire
and wheel assemblies are removed
from the vehicle.
- If replacement is necessary, always replace disc brake pads in axle sets.
- Inspect both edges of the disc brake pad friction surfaces (3). The
highest rate of wear normally occurs at
the trailing edge of the disc brake pads.
- Inspect the thickness of the disc brake pads (3) in order to ensure that
they have not worn prematurely.
The disc brake pad wear should be approximately even per axle set.
- Front brake pads have integral, audible wear sensors (1). When the disc
brake pad wear reaches the
minimum allowable thickness, the wear sensor contacts the disc brake rotor
(2). The wear indicator will
then produce an audible, high-pitched warning noise during wheel rotation.
- Replace the disc brake pads when the friction surface (3) is worn to
within 2.00 mm (0.079 in) of the
mounting plates.
- Verify that any disc brake pad shims that may be required are in place
and not damaged or excessively
corroded. Replace any missing or damaged shims in order to preserve proper
disc brake performance.
- Replace the disc brake pads if any have separated from the mounting
plates.
- Inspect the disc brake pads friction surfaces for cracks, fractures, or
damage which may cause noise or
otherwise impair disc brake performance.
BRAKE CALIPER INSPECTION
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Fig. 8: Brake Caliper Components
WARNING: Refer to Brake Dust Warning .
- Inspect the brake caliper housing (1) for cracks, excess wear, and/or
damage. If any of these conditions
are present, the brake caliper requires replacement.
- Inspect the caliper piston dust boot seal (2) for cracks, tears, cuts,
deterioration and/or improper seating in
the caliper body. If any of these conditions are present, the brake caliper
requires overhaul or
replacement.
- Inspect for brake fluid leakage around the caliper piston dust boot seal
(6) and on the disc brake pads. If
there is any evidence of brake fluid leakage, the brake caliper requires
overhaul or replacement.
Fig. 9: Brake Caliper, Inner Brake Pad And C-Clamp
- Inspect for smooth and complete travel of the caliper pistons into the
caliper bores:
- The movement of the caliper pistons into the caliper bores should be
smooth and even. If the
caliper piston is frozen or difficult to bottom, the caliper requires
overhaul or replacement.
- Insert a discarded inner brake pad (2) or block of wood in front of the
piston. Using a large Cclamp
(1) installed over the body of the caliper (3) and against the brake pad or
block of wood,
slowly bottom the piston in the bore.
READ NEXT:
WARNING: Refer to Brake Dust Warning .
Fig. 10: Exploded View Of Brake Pads And Brake Caliper Mounting Bracket
Inspect the fluid level in the brake master cylinder reservoir.
If the brake fluid l
Removal Procedure
WARNING: Refer to Brake Dust Warning .
WARNING: Refer to Brake Fluid Irritant Warning .
NOTE: Always replace disc brake pads in axle sets.
Inspect the fluid level in the brake mast
SEE MORE:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
Diagnostic Fault
CAUTION: Do not remove the pigtail from either the heated oxygen sensor
(HO2S) or
the oxygen sensor (O2S). Removing the pigtail or the connector will affect
sensor operation.
Handle the oxygen sensor carefully. Do not drop the HO2S. Keep the inline
electrical connector and the louvered end free of