Chevrolet Trax: Brake rotor thickness measurement
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
Fastener Tightening Specifications
DISC BRAKE COMPONENT SPECIFICATIONS
Disc Brake Component Specifications
DIAGNOSTIC INFORMATION AND PROCEDURES
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 Brake Pads Replacement.
Fig. 1: Micrometer On Brake Rotor
- Clean the friction surfaces of the brake rotor with denatured alcohol,
or an equivalent approved brake
cleaner.
- Using a micrometer (1) calibrated in thousandths-of-a-millimeter, or
ten-thousandths-of-an-inch, measure
and record the thickness of the brake rotor at four or more points, evenly
spaced around the brake rotor.
Make sure that the measurements are only taken within the friction surfaces
and that the micrometer is
positioned the same distance from the outer edge of the brake rotor, about
13 mm (1/2 in), for each
measurement.
- Compare the lowest thickness measurement recorded to the specifications.
Refer to Disc Brake
Component Specifications.
- If the lowest thickness measurement of the brake rotor is above the
minimum allowable thickness after
refinishing specification, the brake rotor may be able to be refinished,
depending upon surface and wear conditions which may be
present.
- If the lowest thickness measurement of the brake
rotor is at or below the discard thickness specification,
the brake rotor requires replacement.
BRAKE ROTOR THICKNESS VARIATION MEASUREMENT
WARNING: Refer to Brake Dust Warning .
NOTE: Any disc brake rotor that exhibits thickness variation
exceeding the maximum
acceptable level must be refinished or replaced. Thickness variation exceeding
the maximum acceptable level can cause brake pulsation.
- 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.
Fig. 2: Micrometer On Brake Rotor
- Using a micrometer (1) calibrated in thousandths-of-a-millimeter, or
ten-thousandths-of-an-inch, measure
and record the thickness of the brake rotor at 4 or more points, evenly
spaced around the brake rotor.
Make sure that the measurements are only taken within the friction surfaces
and that the micrometer is
positioned the same distance from the outer edge of the brake rotor, about 13 mm
(1/2 in), for each
measurement.
- Calculate the difference between the highest and lowest thickness
measurements recorded to obtain the
amount of thickness variation.
NOTE: Whenever a brake rotor is refinished or replaced, the
assembled lateral
runout (LRO) of the brake rotor must be measured to make sure optimum
performance of the disc brakes.
- Compare the thickness variation measurement to the following
specification:
Specification
- J93, J94: 0.02 mm (0.0008 in)
- JPW, J97: 0.02 mm (0.0008 in)
- If the brake rotor thickness variation measurement exceeds the
specification, the brake rotor requires
refinishing or replacement.
READ NEXT:
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
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
f
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
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.
DTC Descriptor
DT
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
Fastener Tightening Specifications
DIAGNOSTIC INFORMATION AND PROCEDURES
SYMPTOMS - WHEEL DRIVE SHAFTS
IMPORTANT: Complete the following steps prior to beginning the
wheel drive shaft
diagnosis.
Review the Vibration Diagnosis, Starting Point, an