TM 5-3805-291-23-1
BRAKE SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0015 00
SERVICE BRAKE WEAR INDICATOR (EXISTING BRAKE DISC) CHECK - CONTINUED
N OT E
Values shown on screen are baseline values fo each service brake. The "Brk Meas Hourmeter"
r
value is reading on SMU. The SMU reading was recorded when new brake discs were installed on
machine.
DO NOT modify measurements or "Brk Meas Ho rmeter" values stored in powertrain ECM.
u
Change these values only when installing new brake discs.
19.
Record each value of dimension (C) on piece of paper.
20.
Exit MSD software.
21.
Turn engine start switch to OFF position (TM 5-3805-
291-10).
22.
Disconnect MSD from diagnostic connector (WP
23.
Determine amount of service life available for left
front service brake discs. Write down value of dimen-
sion (C) for left front service brake. Write down base-
line value for left front service brake stored in
powertrain ECM.
427-C2019
24.
Subtract value of dimension (C) from baseline value.
Difference indicates amount of wear that has occurred
to service brake discs.
DISC THICKNESS WEAR CHART
N OT E
ESTIMATED
AMOUNT OF
PERCENTAGE
A difference of 0.058 in. (1.46 mm)
OF
MATERIAL
OIL GROOVE
or more indicates that discs must be
REMAINING
THAT IS
DEPTH
replaced.
BRAKE DISC
WORN FROM
LIFE
THE DISC
If you install a new brake disc in
any of the four service brakes, you
0.000 in.
0.041 in.
must enter a new baseline value.
100
(0.00 mm)
(1.05 mm)
25.
Repeat steps 3 thru 22 for other service brake discs.
0.011 in.
0.036 in.
80
(0.29 mm)
(0.90 mm)
N OT E
0.023 in.
0.030 in.
60
(0.58 mm)
(0.76 mm)
The oil groove depth is the most critical
0.034 in.
0.024 in.
dimension. If the depth of the oil
40
(0.88 mm)
(0.61 mm)
grooves on the brake disc is too shallow,
oil flow will be inadequate. This can
0.046 in.
0.018 in.
20
cause excessive wear and abrasion.
(1.17 mm)
(0.47 mm)
0.058 in.
0.013 in.
26.
To provide an estimate on the amount of service life
0
(1.46 mm)
(0.32 mm)
for a brake disc, refer to Disc Thickness Wear Chart.
0015 00-21
