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Published 01-14-2021 Control # 707-01
CARRIER
TMS9000-2 SERVICE MANUAL
Braking
The top priority of the air system is to provide braking. Each
rear wheel has a spring brake chamber and a service brake
chamber. The spring brake is applied by a spring and
released by pressurized air. The spring brakes on all four
rear wheels are released by the parking brake push-pull
knob on the right side of the front console in the cab. Pushing
in on the parking brake causes air pressure to enter the
spring brake chamber on each wheel and compress the
spring, releasing the brakes. At least 280 kPa (40 psi) is
required to keep the parking brake valve engaged. If supply
2
12
View A
4
15
View B
View C
13
15 14
16
15
15
17
6972-8
6972-6
6972-5
Figure 8-14 continued
Item
Description
Item
Description
1
Air Dryer Module
10
Tractor Protection Valve
2
Supply Dump Valve
11
Cross-Axle Diff Lock Solenoid Valve
(Opt)
3
Front Service Brake Relay Valve
12
Air Suspension Valve
4
ABS Modulator Valve
13
Secondary Air Reservoir B
5
Tire Suspension Solenoid
14
Secondary Air Reservoir A
6
Traction Control Valve
15
Drain Valve Assembly
7
Rear Service Brake Relay Valve
16
Primary Air Reservoir A
8
Inter-Axle Diff Lock Solenoid Valve
17
Primary Air Reservoir B
9
Spring Brake Relay Valve
Fo
r
Reference
Only