Meritor Automobile Accessories MM-9902 User Manual
Conditions: Possible Cause(s): What to Check: Corrections:
➀
Chamber exceeds Incorrect initial Check the chamber stroke If the air chamber still
two-inch maximum
adjustment or after 20 brake overstrokes, replace the
stroke requirement
inoperative automatic applications. caliper/saddle assembly.
adjuster Refer to Sections 3 and 4.
➁
Brake drag Incorrect lining-to- Minimum stroke Replace the caliper/saddle
rotor clearance 7/8-inch (22 mm) assembly.
Incorrect initial Adjust the rotor to pad
adjustment clearance. Refer to Section 4.
Vehicle brake release
Vehicle brake release
Correct operation of the
Repair or replace parts as
pressure malfunction
quick release valve required.
➂
Short outboard Caliper seized or Damaged slide-pin seals Replace the caliper/saddle
brake pad lining life sticking on slide pins assembly.
Caliper should move
back and forth by hand
with linings removed
➃
Short lining life Refer to conditions
➁
Refer to conditions
➁
Refer to conditions
➁
and
➂
.
and
➂
. and
➂
.
Rotor surface Cracks or heavy heat Refer to Section 5 for disc
checking. Refer to inspection.
Section 5.
➄
Brake smoking High brake Refer to conditions
➁
,
➂
Refer to conditions
➁
,
➂
temperature and
➃
. and
➃
.
Grease, oil, etc., on Grease, oil, etc., on the Check for oil leaks in the
the linings linings brake area. Repair as
required. Clean the rotor
and caliper assembly.
Replace the linings.
Refer to Sections 3 and 4.
➅
Poor stopping Vehicle brake release
Correct operation of the
Have the system evaluated
power pressure malfunction
quick-release valve by a qualified brake system
specialist.
•
• Long stopping Brakes out of Stroke exceeds Refer to condition
➀
.
distances adjustment two-inch requirement
•
• Poor driver feel
Vehicle overload Refer to the GAWR Observe the vehicle
•
• Lack of normal limitations on the vehicle manufacturer's load
response I.D. plate. recommendations.
Lining contamination
Grease, oil, etc., on the Inspect for oil leaks in the
linings brake area. Repair as
required. Clean the rotor and
caliper assembly. Replace the
linings. Refer to Sections 3
and 4.
DXP 195 Air Release and Hydraulic Release Parking Disc Brakes
15