Thomas SAF-T-LINER C2, Maintenance Manual

Page: 120 / 176

replace any damaged harness. Disconnect any
loose connectors and inspect the terminals for
corrosion. If corrosion is present, replace the ter-
minals. If corrosion is not present, reconnect the
connector.
5. Check the fuse for the hydraulic brake booster
pump, as follows.
5.1 Open the cover to the main power distri-
bution module (PDM).
5.2 Pull the fuse in position F6 for the Hydro-
Max relay.
5.3 Inspect the relay to make sure the fuse is
not damaged. If the fuse is damaged, in-
stall a new fuse. If the fuse is not dam-
aged, install the fuse in position F6.
5.4 Close the PDM cover.
6. Check the operation of the Hydro-Max brake
booster, as follows.
6.1 With the ignition off, depress the brake
pedal and listen for the back-up motor to
engage. The operator should also feel the
pedal force relieve and the pedal should
depress easily.
6.2 With the engine running and the parking
brake released, ensure that the BRAKE
warning indicator light is
not on. This is a
dual indicator, and indicates that the park-
ing brake is set, and warns if there is a
Hydro-Max failure condition other than
loss of back-up motor power.
42–12 Brake Caliper Slide Pin
Lubricating, Bosch
Hydraulic Brakes
WARNING
Breathing brake lining dust (asbestos or non-
asbestos) could cause lung cancer or lung dis-
ease. Unless exposure can be reduced below legal
limits, wear an air purifying respirator approved
by MSHA or NIOSH at all times when servicing the
brakes, starting with removal of the wheels and
continuing through assembly.
NOTE: See the Bosch Pin Slide Disc Brakes
Service Manual for more information.
07/31/2015 f460513b
A
B
A. Open caps and check fluid level.
B. Fill to this level.
Fig. 7, Hydraulic Brake Reservoir
f422649 07/16/2018
Due to the mounting angle of the hydraulic brake reser-
voir on some vehicles, it is not possible to fill the back
reservoir up to the bottom of the fill-neck. For these ve-
hicles, fill only the front hydraulic brake reservoir up to
the bottom of the fill-neck.
Fig. 8, Hydraulic Brake Reservoir, Alternate Mounting
Angle
Brakes
42
Saf-T-Liner C2 School Bus Maintenance Manual, November 2020
42/10