Section 4: Removal And Disassembly; Removal - Meritor MM-2075 Maintenance Manual

4 Removal and Disassembly
Removal and Disassembly
Hazard Alert Messages
Read and observe all hazard alert messages in this publication.
DANGER
Before performing any brake service, identify the vehicle's
hydraulic system and refer to the service manual for procedures.
Some brake application systems are fully-pressurized, and this
pressure cannot be reduced by switching off the ignition or
removing the battery. To prevent death, serious personal injury or
damage to components, carefully follow the procedures for the
hydraulic system being serviced.
DANGER
Park the vehicle on a level surface. Block the wheels to prevent
the vehicle from moving. Support the vehicle with safety stands.
NEVER work under a vehicle supported only by jacks. Jacks can
slip and fall over. Failure to use safety stands can result in death
or serious personal injury and damage to components.
DANGER
ASBESTOS AND NON-ASBESTOS FIBERS - Some brake linings
contain asbestos fibers, a cancer and lung disease hazard.
Some brake linings contain non-asbestos fibers, whose
long-term effects to health are unknown. Use caution when
handling both asbestos and non-asbestos materials. Refer to
Section 2 for asbestos and non-asbestos safety information and
recommended work practices.
WARNING
To prevent eye injury, always wear eye protection when performing
vehicle maintenance or service.

Removal

Brake Pads
Measure the brake pad thickness. The brake pad thickness is the
distance from the friction material surface to the brake pad backing
plate interface. Figure 4.1.
If any brake pad is 1/16" (1.6 mm) or less: Replace all brake
pads on the axle being inspected.
If the brake pad thickness is greater than 1/16" (1.6 mm)
and the user would like to continue using the current brake
pads: Evaluate if the remaining lining is sufficient to reach the next
scheduled service.
MM-2075 / Revised 09-23
Page 8
THICKNESS
1/16"
(1.6 mm)
BACKING PLATE
Figure 4.1
• Brake pads should wear evenly, but some level of uneven wear
and/or taper wear may occur due to operating environment and
rotor condition.
• If the wear is believed excessive, then the caliper should be
inspected to validate operation. Refer to Caliper on page 19.
If you replace the pads: Replace all of the disc brakes pads at
the same time to maintain original brake balance.
If a complete vehicle pad replacement is not necessary
or desirable: Replace the pads on both wheel ends on the
same axle.
Replace the Brake Pads
The brake pads must be installed when applying the brakes. If
brake pads are not installed, damage to the pistons can result.
1. Wear safe eye protection.
2. Park the vehicle on a level surface. Block the wheels to
prevent the vehicle from moving.
3. Use a jack to raise the vehicle so that the wheels to be
serviced are off the ground. Support the vehicle with safety
stands.
4. Remove the wheel and tire assembly according to the
manufacturer's recommendation.
5. Remove the master cylinder reservoir filler cap. Check the
brake fluid level in the reservoir. If necessary, remove fluid to
keep the reservoir from overflowing when compressing the
pistons into the caliper.
6. Remove the pad retainer spring bolt. Figure 4.2.
NOTE: The brake linings and the brake rotor wear in service. The
rotor will develop a wear edge that will affect removing the brake
pads. The brake pistons must be seated to allow the brake pads to
be removed.
Copyright Meritor, Inc., 2023
FRICTION
MATERIAL
4022007a
CAUTION
Printed in USA
(16579)