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Technical Bulletin
Technical Bulletin
Hazard Alert Messages
Read and observe all Warning and Caution hazard alert messages in
this publication. They provide information that can help prevent
serious personal injury, damage to components, or both.
WARNING
To prevent serious eye injury, always wear safe eye protection
when you perform vehicle maintenance or service.
Park the vehicle on a level surface. Block the wheels to
prevent the vehicle from moving. Support the vehicle with
safety stands. Do not work under a vehicle supported only by
jacks. Jacks can slip and fall over. Serious personal injury and
damage to components can result.
Release all air from the air systems before you remove any
components. Pressurized air can cause serious personal
injury.
Do not attempt to open or disassemble the inversion relay
valve. This valve has an internal spring that may be damaged
by opening the valve. In addition, internal spring forces may
cause serious personal injury.
Overview
Access Product and Service Information
For additional information about WABCO's inversion relay valve,
please contact the WABCO Customer Care Center at 855-228-
3203. Literature covering the complete WABCO product line is
posted on our website, www.wabco-na.com.
WABCO Inversion
Relay Valve (IR-2)
Revised
1 Technical Bulletin
TP-0357
06-19
Inversion Relay Valve (IR-2)
The inversion relay valve (IR-2) combines the functions of two air
brake system valves:
A relay valve
An inversion valve with anti-compounding protection
Under normal conditions, the IR-2 responds to a control signal from
a dash-mounted parking brake control valve to supply or exhaust air
from the spring brake chambers, thereby applying the spring
brakes. In the event of a primary air system failure, the IR-2 makes
a modulated application of the spring brakes by means of the foot
valve. A typical IR-2 valve installation is shown in Figure 1.
TP-0357
Revised 06-19
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Summary of Contents for WABCO IR-2
- Page 1 Park the vehicle on a level surface. Block the wheels to brakes. In the event of a primary air system failure, the IR-2 makes prevent the vehicle from moving. Support the vehicle with a modulated application of the spring brakes by means of the foot safety stands.
- Page 2 Look at the air line installation to make sure all air lines are mounting surface. Tighten to 15 ± 2 lb-ft (20 ± 3 N m). correctly installed and that all connections are secure. Figure 2. TP-0357 Revised 06-19 (16579) Page 2 Copyright WABCO, Inc. 2019 Printed in the USA...
- Page 3 PORT 41 should be 90-105 psi (621-724 kPa). PORT 12 Apply the parking brakes by pulling out the dash-mounted park brake knob. The IR-2 will exhaust all air in the spring brake PORT 22 chambers, applying the spring brakes. PORT 23...
- Page 4 Information contained in this publication was in effect at the time the publication was approved for printing and is subject to 1220 Pacific Drive change without notice or liability. WABCO reserves the right to revise the information presented or to discontinue the Auburn Hills, MI 48326 USA production of parts described at any time.