TrCM+ | Safe Parking

TrCMplus Safe Parking HALDEX.png

Park and shunt valve with integrated emergency braking valve for the service brake system, as well as a pressure protection valve for auxiliary devices (e.g. air suspension) for twin-line air brake equipment in trailer vehicles.

'Safe Parking' is an additional function which ensures that upon disconnection of the air supply line (red  coupling) the trailer parking brake is engaged.

Function - Installation - Inspection - Maintenance - Technical data - Symbol




Shunt  Valve

Black knob

Park Valve

Red knob

Trailer coupled


Operation Conditions

Service brake System

Park brake System

image304.png pulled pushed (must be manually pushed) yes Drive released released
image307.png pulled automatic pulled out no Trailer uncoupled/braked Emergency function engaged Safety function:
Released via overload protection valve
image305.png pushed pushed no Shunting released released
image306.png pushed pulled no Parking (uncoupled) released engaged
image307.png pulled pulled yes Parking (coupled) released engaged

Warning - Danger!
Before starting the journey, the spring brake cylinder must be released manually by pushing the park valve.

TRCMplus_Label_028047719 (2).png


  • The TrCM+ is fixed to the vehicle chassis with two/three M 8 bolts.
  • The control knobs must be easily accessible.
  • Not used ports must be plugged.
  • For painting/coating all open ports must be protected to avoid penetration of the paint/coat.
  • For fittings / push-in fittings refer to the instructions of the respective manufacturer.


  1. System without pressure
    Shunt valve (black button) must be pushed in (securing the trailer vehicle previous to this test), park valve (red button) automatically pushed out.
  2. Initial charging
    Apply pressure to port 1; the shunt valve (black button) must go into the operating position (jump out). The park valve (red button) remains pushed out.
  3. Automatic emergency braking
    Lower the pressure at Port 1 to 0 bar; the port 21 emergency braking must activate automatically.
  4. Pressure protection valve
    Instructions for adjustment may be found in the fitting instructions, order no.: 000 314 012.
  5. Park brake valve (red button)
    Apply pressure to port 1. park valve (red button) automatically pushed out, push the park valve (red button) in, at least 5.0 bar in the supply reservoir, pull the park valve (red button), port 2 (spring brake system) must vent down to 0 bar, vehicle braked.


According to legal registrating country requirements or the statutory regulations of § 29 StVZO. If defects are discovered, either during examination of the vehicle or when travelling, the valve must be replaced.

The cage filter 029 000 409 in Port 1 must be replaced when soiled or damaged.

Technical data

Operating pressure pe = 10 bar
Operating temperature - 40°C - + 70°C
Medium Air
Weight ca. 1.8 kg
Pressure protection valve DIN 74279 - C 6-22
Opening pressure pe =  ca. 6.2 bar
Closing pressure pe =  min 5.2 bar


 Port Description
1 Inlet port (Red coupling head, supply line)
1-2 Inlet/delivery port (reservoir)
2 Delivery port (spring brake actuator)
3 exhaust (spring brake actuator)
4 control port (Yellow coupling head, control line)
12 must be connected to port 21
21 delivery port (EBS/ABS)
22 plugged
23, 24, 25 delivery port (PPV = pressure protection valve, suspension)

For more technical information see TÜV report No. KO250.4E in the documentation page


DIN 74253