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Inspection
Hazard Alert Messages
Read and observe all hazard alert messages in this publication.
WARNING
To prevent eye injury, always wear eye protection when performing
vehicle maintenance or service.
Intervals
Periodically inspect the brakes. Check the caliper, torque plate,
pads and rotor for signs of wear and damage. Also check for any
loose or missing screws. Use the schedule below that gives the
most frequent inspections. For additional roadside inspection
information, contact the Meritor OnTrac™ Customer Call Center at
866-OnTrac1 (688-7221).
• Fleet chassis lubrication schedule
• Chassis manufacturer lubrication schedule
• At least four times during lining life
• At tire replacement
Inspect Parts
Caliper
1.
Clean the area around the brake hose. Use brake parts
cleaner.
2.
Inspect the piston and boots for wear and damage. Replace
worn or damaged parts.
3.
Inspect the caliper lining wear plates for wear and damage.
Replace worn or damaged wear plates.
4.
Inspect the housing for cracks or damage. Replace a cracked
or damaged housing.
Torque Plate
1.
Inspect the caliper mounting area of the torque plate for rust
or corrosion. Replace a damaged or worn torque plate.
2.
Use a wire brush to clean the caliper mounting area.
3.
Inspect the torque plate for cracks or elongated bolt holes.
If these conditions exist: Replace the torque plate.
Rotor
Visually inspect the rotor. Refer to Cracks on page 16.
(16579)
Printed in USA
Brake Caliper Bleeding Procedure
This bleed sequence refers to bleeding the caliper and does not
consider the hydraulic application system requirements. Identify
the vehicle hydraulic application system type and refer to that
service manual before performing any brake service. Adhere to
the hydraulic application system bleeding procedures to prevent
death or serious personal injury and damage to components.
Refer to the manufacturer's service information for ABS bleeding
instructions.
1.
Check the master cylinder reservoir and fill, if necessary, with
OEM approved brake fluid.
2.
Bleed the brakes in the following order: right rear, left rear,
right front and left front.
When bleeding a four-piston caliper, monitor the brake fluid level
to ensure the system does not become drained. Add brake fluid
to the reservoir as needed to prevent death or serious personal
injury and damage to components.
Always install new brake fluid into the caliper. Discard old brake
fluid. Do not reuse it. Damage to components can result.
NOTE: Each four-piston caliper is equipped with two bleed screws.
To ensure air is removed from a caliper, the bleed sequence is
inboard, outboard, and repeat inboard.
3.
Install a section of clear, flexible tubing with a 1/4-inch inner
diameter over the inboard bleeder. Insert the other end of
the tubing into a container to collect the purged brake fluid.
Discard the brake fluid. Do not reuse old brake fluid.
4.
If a pressurized bleeding system is not required by the vehicle
manufacturer's service procedures, apply and hold the brakes
to pressurize the system.
5.
Repeat the procedure for the outboard bleed screw.
6.
Repeat the procedure for the inboard bleed screw.
7.
Tighten the bleed screws to specification. Refer to Section 11
Specifications on page 26.
8.
Test the brakes prior to returning the vehicle to service.
Copyright Meritor, Inc., 2023
8
Inspection
DANGER
DANGER
CAUTION
MM-2075 / Revised 09-23
Page 19
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