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Published 01-14-2021 Control # 707-01
CARRIER
TMS9000-2 SERVICE MANUAL
8.
With brakes released, check installation indicator
(Figure 8-46) and (Figure 8-47) to determine proper
adjustment.
9.
If installation indicator is not positioned properly, refer to
(Figure 8-47). Loosen fastener holding indicator to
anchor bracket, rotate indicator as required and re-
tighten fastener.
10.
Uncage spring brake if so equipped.
REAR BRAKES
Description
Brakes
The rear brakes are air actuated and cam operated. Each
shoe, which is steel fabricated, employs two 19 mm (0.75 in)
tapered block liners. The shoes are mounted on individual
anchor pins and supported by open type spiders. Automatic
slack adjusters maintain proper adjustment of the push rod
stroke and lining the drum clearance.
The brake actuator is a conventional brake air chamber with
an eme rgen cy (pa rking) bra ke sp ring me cha nism
incorporated into the air brake chamber. The brake chamber
has an aluminum body and pressure plate with a steel
nonpressure plate that houses a service/emergency
diaphragm, piston, and two springs.
Spring Brake Actuator
The spring brake actuator, which is the upper part of the air
brake chamber, is spring applied and air released. When an
air pressure of 482 kPa (70 psi) or more is applied against
the piston, the spring is compressed and braking is done with
the service brakes. When the air pressure is removed, the
spring pushes against the piston and diaphragm plate to
apply the brake. Internal venting works in conjunction with a
one-way breather cap that allows system air to fill the
vacuum behind the piston to keep out atmospheric air and
contamination. The unit is equipped with a manual caging
bolt to permit safe handling and service work.
Maintenance
For Maintenance and Troubleshooting Brakes, refer to next
Section and Table or
Fo
r
Reference
Only
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