BMW 7 Owners & Service Manuals

BMW 7 Series: ARS Hydraulic Valve Manifold

Vertical Dynamics Systems
Fig. 121: Identifying ARS Hydraulic Valve Manifold Components


  1. Front-axle pressure valve [PVV]
  2. Rear-axle pressure valve [PVH]
  3. Switch-position detector [SSE]
  4. Front-axle pressure sensor [DSV]
  5. Rear-axle pressure sensor [DSH]
  6. Failsafe valve [FS]
  7. Direction valve [RV]

The hydraulic valve block is located on the floor plate of the vehicle behind the front right-hand wheel housing level with the front right-hand door. The hydraulic valve block is connected to a carrier plate bolted to the body.

The hydraulic valve block houses the following valves and sensors:

  • 2 pressure valves; 1 for the front suspension and 1 for the rear suspension [these are proportional pressure limiting valves]
  • 1 directional control valve
  • 1 failsafe valve
  • 2 pressure sensors; 1 sensor for the front suspension, 1 sensor for the rear suspension
  • Switch-position detector

Tandem Pump

Vertical Dynamics Systems
Fig. 122: Identifying Tandem Pump Components


  1. Radial piston pump (ARS)
  2. Intake restrictor valve
  3. Electronic volumetric flow control (EVV) valve
  4. Vane pump (power steering)

The hydraulic pumps fitted in this model series were based on a modular design principle. Depending on the engine and equipment specification, a suitably dimensioned hydraulic pump is flange-mounted to the engine in the same installation space.

Decisive equipment features for these tandem pumps:

  • Basic steering
  • Integrated Active Steering (IAL)
  • CO2 reduction measures
  • Dynamic Drive (ARS)
  • Dynamic Drive (ARS) and Integrated Active Steering (IAL)
  • Intake restrictor valve

The hydraulic pump driven by the engine's poly-V belt is, on vehicles with Dynamic Drive, invariably a tandem pump, which consists of a radial-piston pump section for ARS and a vane pump section for the power steering.

Radial-piston pump section of the tandem pump

This radial piston pump has 8 pistons in a single row and is designed for a maximum pressure of 210 bar.

When the engine is idling, the pump speed is approximately 750 RPM. At that speed, the radial piston pump section delivers a minimum fluid flow rate of approximately 5.5 l/min at a pressure of approximately 3 bar.

Consequently an adequate fluid flow rate is guaranteed even at idling speed.

At a pump speed of 1450 RPM, the maximum fluid flow rate is limited to approximately 9 l/min.

New feature

As a CO2 reduction measure when driving in a straight line, the fluid flow rate of the radial piston pump is restricted by a restrictor valve on the intake side, thereby substantially reducing the circulation pressure and, therefore, the engine power used to drive the pump. As a result, active control of the intake restrictor valve makes a positive contribution to the CO2 equation.

The Dynamic Drive and hydraulic power steering share a common fluid reservoir and fluid cooler.


     Vertical Dynamics Control

    General Information When driven vigorously or on an uneven road surface, a vehicle tends to respond with undesirable body movements. BMW first developed Vertical Dynamics Control for the E70 and was

     Vertical Dynamics Control (VDC)

    Control Unit Fig. 124: Identifying VDM INDEX REFERENCE CHART VDM The location of the VDM control unit is dependent on the country in which the vehicle is sold. On left-hand drive vehicles the c

     Electronic Ride-Height Control

    Function of Air Springs The various control modes on the F01/F02 are similar to those on other model series such as the E70: Fig. 131: EHC Control Mode Flowchart, F01/F02 Control Modes with Single-a


     Removing And Installing/Renewing Rocker Arms On Right Side (N63)

    Necessary preliminary work (cylinder bank 1 to 4) Remove INLET AND EXHAUST ADJUSTMENT UNIT on right side. Remove right INLET CAMSHAFT. Remove right EXHAUST CAMSHAFT. IMPORTANT: Used rocker arms (1) may only be reused in the same position. Tolerance classes are not required. Remove rocker arm (

     Parked-car ventilation

    Concept The car's interior can be cooled or heated before driving off with the parked-car ventilation. Depending on set temperature and ambient temperature, the car's interior is ventilated or possibly heated using the residual engine heat. General information The system can be switched on and off d

    © 2019-2024 Copyright