1999 BMW 528I TOURING Level Control System Manual

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BMW 528I TOURING 1999 E39 Level Control System Manual Initial Print Date:3/02Revision Date:
Subject Page
Hydraulic Level Control System .........................................................
Air Suspension Systems (EHC) ...............................

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BMW 528I TOURING 1999 E39 Level Control System Manual 2
Level Control Systems
Model: Level Control Systems 
Production:  E32 750iL 88-94 (Hydro-Pneumatic)
E32 740iL 93-94
E38 750iL 95-01
E38 740iL 95-01
E34 Touring 525iT, 530iT
E39 Touring 528iT, 540iT,

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BMW 528I TOURING 1999 E39 Level Control System Manual 3
Level Control Systems
Level Control Systems
Purpose of the System
The primary function of Level Control Systems is to maintain the height of the vehicle as
closely as possible to a predetermined lev

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BMW 528I TOURING 1999 E39 Level Control System Manual 4
Level Control Systems
Hydropneumatic Rear Leveling System
This module pertains to the hydropneumatic rear suspension system with the engine dri-
ven piston pump.  The earlier system using the electr

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BMW 528I TOURING 1999 E39 Level Control System Manual 5
Level Control Systems
System Components
The system consists of the following components:
 Tandem Hydraulic Pump
 Oil Reservoir
 Pressure Reservoir (2)
 Control Valve with Regulating Linkage
 Ca

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BMW 528I TOURING 1999 E39 Level Control System Manual 6
Level Control Systems
Tandem Pump
The tandem pump consists of a vane pump for power steering and a radial pump for self-
leveling suspension. Both pumps are driven by the same shaft and have separat

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BMW 528I TOURING 1999 E39 Level Control System Manual 7
Level Control Systems
Oil Reservoir
The single reservoir stores fluid for both the self-leveling and power steering systems.
Incorporated in the reservoir, is a reed type level warning switch. If th

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BMW 528I TOURING 1999 E39 Level Control System Manual 8
Level Control Systems
Pressure Reservoirs
The oil pressure reservoirs (2) on each strut incorporate a membrane and are nitrogen gas
filled. They are designed to absorb the oil which is expelled from
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