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Further details for you 
The parking release emergency valve (PREV) replaces the trailer brake valve that was previously installed in the EBS trailer brake systems and the double release valve. It includes the typical functions for a trailer brake valve, such as the pull-off function or pressure retention in the case of an uncoupled trailer, as well as the functions of a double release valve.
Brand
Wabco Check valve
yes Color control knob
red/black Connection 1-1 – power in/output
M 16x1,5 Connection 1-2 – power in/output
M 16x1,5 Connection 2 – power output
M 16x1,5 Connection 3 – atmosphere
M 22x1,5 Connection 4 – control connection
M 16x1,5 Deposit item
no Emergency brake function
yes - via BBA Max. operating pressure (bar)
10 Operating sign
yes Ref. no.
Wabco 971 002 900 0 Reman
no Weight (kg)
1,701
