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20
MBS-1P Installation
NOTE: If the plumbing cannot be accomplished within the five foot
maximum length, the relay valve can be fed directly with a 3/8" tube from
the “DEL” port of the MBS-1P. The feed for the trailer spring brake valve
can be taken from a tee connection upstream of the MBS-1P. Use a 3/8"
line to the Trailer Emergency Valve (TEV).
For this configuration, the volume of the line to the spring brake valve is not
included in the calculation.
Following these guidelines will usually result in an installation that complies
with application and release brake timing requirements. However, always
check application and release times for each configuration.
IMPORTANT: When the anti-compounding port of the Trailer
Emergency Valve (TEV) is plumbed in before the PCM the straight
through connection must be plumbed to the PCM and the branch
connection to the TEV. All airline used in this case can be 3/8” tubing
because the PCM does not exhaust this portion of the airline during an
ABS event. For this plumbing configuration, omit this length of airline
when calculating allowable tubing lengths.
Relay Valve
Provided that all brake application and release timing requirements are met,
a Bendix relay valve (WNC part number 12900570) is approved for all
applications. This valve is normally included with the MBS-1P installation kit.
IMPORTANT: Wabash National must approve all installations that
use other relay valves.
Sensors
Bosch, Midland, or Wabco sensors are approved by Wabash National for all
installations. However, the sensor and sleeve must be made by the same
manufacturer. For example, Bosch sleeves cannot be used with Wabco sensors.
Correct sensors and sleeves are included with the MBS-1P installation kit.
