Bendix Commercial Vehicle Systems R-12P PILOT RELAY VALVE 4/11 - Manual (Page 6)

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NOTE: If a supply line single check valve is present (see
Figure 2), check it for leakage. Disconnect the inlet
side of the single check valve and coat the open
end with a soap solution. Make and hold a full
brake application. Leakage of a one inch bubble in
fi ve seconds is permissible. If the valve’s leakage
is excessive, replace it with a 1/2” single check
valve.
REMOVAL
1. Drain all system air pressure.
2. Identify and mark or label all air lines and their
connections to the Bendix ® R-12P ™ valve and the single
check valve, if present. Then disconnect the air lines.
3. Remove the R-12P ™ valve from the vehicle.
INSTALLATION
1. Use the mounting bracket provided, or, if securing the
valve to a reservoir, use a Schedule 80 (heavy wall)
short couple pipe nipple.
2. Reconnect all air lines to the valve using the
identifi cation made during removal. Be sure to use pipe
thread sealant.
3. Test all air fi ttings for excessive leakage and tighten as
needed. Also, perform OPERATIONAL AND LEAKAGE
TESTS before placing the vehicle back into service.