Haldex
SUMS
Electronic Braking Systems
ABS
Brake Components
Coupling Head
Inline Filter
Relay Emergency Valve (REV)
Installation
Technical data
Variants
Load Sensing Valves
Park & Shunt Valve
TrCM | Trailer Control Module
TrCM+ | Safe Parking
TEM | Safe Parking
TEM+
Quick Release Valve
Actuators
Air Suspension
Air Disc Brakes
Brake Adjuster
Software
Brake and suspension schematics

Installation

The relay emergency valve should be installed with the vent facing downwards and with its mounting flange secured by two bolts on the vehicle frame. The automatic release valve, Part No. 352 012 001 is flange mounted on the relay emergency valve by means of two socket head cap screws M 8 x 20, Part No. 051 010 909. An O-ring, Part No. 024 033 109 and a sealing ring, Par No. 025 002 109 must be used for sealing the flange port. (Refer to types for part numbers of combinations).  Care must be taken in the case of combined versions to ensure that the actuation devices are easily accessible. The relay emergency valve, together with its combinations must be maintained as part of legal regulations.

Inspection

Ensure the function of the relay emergency valve meets the corresponding functional diagrams.
The functionality of the automatic release valve must also be checked, in addition to the above check for leaks

  • With the vehicle stationary, and the brake system ready for operation, the supply line to the trailer vehicle is uncoupled. The piston rods of the brake chambers on the trailer must extend quickly.
  • The brake must be released when the push button of the automatic release valve is depressed against the stop.
  • The push button must return to its initial position when it is in the position for manoeuvring and air is once again allowed to enter the supply line of the trailer.

 

Checking and adjusting the predominance device

In order to check the predominance device, apply pe 4 = 3.5 bar at port 4 and measure the modulated pressure pe 2 at outlet port 2. In order to adjust the predominance, allow air to escape at port 4 to atmosphere. Using a 10 mm open-ended wrench, loosen the locknut on the adjusting screw of the predominance device and turn the adjusting screw with an 8 mm open-ended wrench.

  • Turning in clockwise direction = increasing the predominance setting
  • Turning counter clockwise = decreasing the predominance setting

Note the specifications of the vehicle or brake manufacturer when adjusting the predominance.