Meritor MM-2075 Maintenance Manual page 29

Condition Possible Causes
Lining wear Brake not releasing
difference on the
same axle - left vs
right
Incorrect caliper size
Companion brake does not work
properly
Operating environment - side to side
Lining wear per Brake not releasing
axle - front vs rear
Axle overload (front vs rear)
Operating environment
Lining life and lining wear patterns.
• Lining life will vary by vehicle vocation, operating environment, loading, rotor finish and driving habit.
• Linings should wear evenly, but some level of taper or uneven wear can occur due to the conditions noted above.
• Accelerated, tapered or uneven lining wear that is considered excessive does not in itself prove a caliper is not operating properly. The wear
condition requires further inspection to determine the root cause.
Smoking brakes Brake applied
Brake system holding pressure
Contamination on the rotor or brake
lining
Vehicle overloaded
Driving habit - excessive braking
System control issue
(16579)
Printed in USA
Check for
Verify caliper not holding pressure.
Open bleed screw and check if brake
releases.
Verify calipers on the same axle are
the same size
Inspect companion brake function (a/b
rotor temp check)
Inspect companion brake pads and
rotor for contaminates affecting
performance
Verify calipers not holding pressure.
Open bleed screw and check if brake
releases.
Refer to the weight limitations on the
vehicle identification plate
Debris exposure - compare exposure
per axle
System issue applying pressure to
brake
Open bleed screw and see if brake
releases
Grease, oil, undercoat, paint, etc.
on the lining and/or rotor braking
surfaces
Verify loading is within weight rating
defined on VIN plate
Aggressive driving.
Not releasing brake for extended
periods – example, holding brake to
modulate speed on mountain descent
Aggressive driving.
Not releasing brake for long periods
(drag)
Check for any dash warning signals
Copyright Meritor, Inc., 2023
9 Troubleshooting
Correction
Hydraulic system issue - refer to
vehicle manufacturer instruction.
Correct caliper size per OEM caliper
requirements.
Service caliper as needed.
Review vehicle cleaning schedule
frequency and metrics to address
wheel end debris condition.
Hydraulic system issue - refer to
vehicle manufacturer instruction.
Observe the vehicle manufactures
load recommendations.
Review vehicle cleaning frequency and
process to address wheel end debris
conditions.
Inspect application system.
Inspect actuation system.
Repair source of leak.
Replace brake pads and clean rotor
braking surface.
Adhere to VIN plate loading.
Adjust driving habit.
Mountain descent – do not
continuously hold brake during a
mountain decent to control speed.
Intermittently release the brakes too.
This intermittent braking allows the
brake to cool when brakes are not
applied.
Braking for speed control (descending
a grade) requires the brakes to be
intermittently released to cool - this is
referred to as brake snubs.
Correct system issue as required.
MM-2075 / Revised 09-23
Page 25