Section 250-0190
SM 1940 4-00
3
When control lever (1) is moved to the 'Release'
position, the pressure reading at port 'A' should be the
same as the inlet pressure at port 'B' and there should
be no pressure at port 'C'.
Finally, when control lever (1) is moved to the 'Park'
position, there should be no pressure at ports 'A' and 'C'.
When testing for air leaks, start with the control lever
(1) in th 'Release' position. After the initial exhaust of
air, apply a soap solution to the exhaust port and valve
housing and check for leakage. No leakage is
permitted from the valve housing and any leakage
from the exhaust port must not exceed a 13 mm
(0.5 in) diameter soap bubble in 5 seconds. Repeat
test for 'Emergency' and 'Park' positions.
If the valve is found to be leaking, it must be replaced.
MAINTENANCE
The park/emergency control valve is a non-serviceable
item and should be replaced completely if damaged.
SPECIAL TOOLS
There are no special tools required for procedures
outlined in this section. Refer to Section 300-0070,
SERVICE TOOLS, for part numbers of general service
tools required. These tools are available from your
dealer.
Braking System - Park/Emergency Control Valve
INSTALLATION
Numbers in parentheses refer to Fig. 1.
Note: Tighten all fasteners to standard torques listed
in Section 300-0080, STANDARD BOLT AND NUT
TORQUE SPECIFICATION.
1. Secure valve body to mounting bracket on
underside of dash panel using mounting hardware as
removed at 'Removal'.
2. Install air lines and electrical connection to valve
body, as tagged at 'Removal'.
3. Start engine and allow air pressure in the tanks to
build up to correct operating pressure. Check for leaks
at air lines and tighten as required.
4. Check operation of park/emergency control valve
for correct operation in all three positions.
TESTING
Numbers in parentheses refer to Figs. 1 and 2.
Block all road wheels and ensure air tanks are fully
charged. With control lever (1) in 'Emergency' position,
the air pressure at port 'C' should be the same as the
inlet pressure at port 'B' and there should be no
pressure at port 'A'.
* * * *
Courtesy of Machine.Market
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