TP-0357
(16579)
Revised 06-19
Printed in the USA
Copyright WABCO, Inc. 2019
Page 3
Figure 3
Table A: IR-2 Valve Port Identification
Troubleshooting
Function Tests
Non-Failure Mode
When the vehicle’s primary air system is functioning correctly, the
IR-2 valve passes reservoir air to the spring brake chambers as
directed by the park brake valve. To test this operation:
1.
Park the vehicle and apply the parking brakes. Place blocks
under the tires to prevent the vehicle from moving.
2.
Follow standard shop procedures to install a test gauge in the
delivery line of the valve or at the spring brake chamber.
3.
Fully charge the air brake system to 105-130 psi
(724-896 kPa).
4.
Release the parking brakes by pushing in the dash-mounted
park brake knob.
5.
Check the pressure reading. The test gauge pressure reading
should be 90-105 psi (621-724 kPa).
6.
Apply the parking brakes by pulling out the dash-mounted park
brake knob. The IR-2 will exhaust all air in the spring brake
chambers, applying the spring brakes.
If the IR-2 valve does not function as described, check the
installation. Make sure all air lines are correctly routed. Check
the connections for leaks. Make the necessary repairs and
retest. If the problem persists, it may be necessary to replace
the valve. If you have any questions or need additional
assistance, contact the WABCO Customer Care Center at
855-228-3203.
Anti-Compounding
The anti-compounding feature occurs if the service brakes are
applied while the spring brakes are already applied. If this occurs,
the valve will deliver air to the spring brake chambers to release the
spring brakes. To test this function:
1.
Park the vehicle. Do not apply the parking brakes. Place blocks
under the tires to prevent the vehicle from moving.
2.
Follow standard shop procedures to install a test gauge in the
delivery line of the valve or at the spring brake chamber.
3.
Fully charge the air brake system to 105-130 psi
(724-896 kPa).
4.
Apply the parking brakes by pulling out the dash-mounted park
brake knob. The IR-2 will exhaust all air in the spring brake
chambers, applying the spring brakes.
5.
Make a service brake application by stepping on the foot valve.
This will send reservoir service brake air to the spring brakes.
6.
Check the pressure gauge to ensure reservoir pressure
is delivered to the spring brakes, thus indicating the
anti-compounding feature is functional.
If the IR-2 valve does not function as described, check the
installation. Make sure all air lines are correctly routed. Check
the connections for leaks. Make the necessary repairs and
retest. If the problem persists, it may be necessary to replace
the valve. If you have any questions or need additional
assistance, contact the WABCO Customer Care Center at
855-228-3203.
Figure 3
IR-2 Valve Port Assignments
Port
Function
Typical Line Size
11
12
Reservoir ports
NOTE:
If the system includes a
line with blended air from both
tanks through a double check
valve, only one supply line is
connected to the valve. Plug
the remaining port.
1/2" O.D. Tube
21
22
23
24
Delivery ports to spring brake
chambers. If the vehicle has
only two spring brakes, plug
the remaining two ports.
3/8" I.D. Hose
41
Control port to primary
brake circuit
3/8" O.D. Tube or
Push-to-Connect
42
Control port to secondary brake
circuit
3/8" O.D. Tube or
Push-to-Connect
43
Control port to park brake valve
3/8" O.D. Tube or
Push-to-Connect
EXHAUST
4003007a
PORT 43
PORT 41
PORT 24
PORT 12
PORT 22
PORT 23
PORT 21
PORT 42
PORT 11
