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1、? ? ?NOTE The information contained in this training course manual is intended solely for participants of the BMW Service Training course. Refer to the relevant “Technical Service“ information for any changes/supple- ments to the Technical Data. 2001 BMW AG Mnchen, Germany. Reprints of this manual o
2、r its parts require the written approval of BMW AG, Mnchen VS-42 MFP-HGK-BRK_0400-0460ContentsPageCHAP 1E85 Chassis1 Introduction1 Front axle1 Rear axle1 Springing/damping2 Steering2 Wheels/tyres2 Brakes3 - Notes for Service8CHAP 2E85 Electric Power Steering (EPS)11 Introduction11 - Advantages12 Sys
3、tem overview13 - EPS bus overview13 - EPS input/output signals14 - EPS system schematic15 Components16 - Upper steering column assembly17 - Lower steering spindle22 - Steering gear24 System description25 - Steering-torque recording25 System functions29 - FDC button29 - Indicator lamp29 Notes for Ser
4、vice30 - Changing servo assistance30 - Working on steering column32 - Diagnosis33CHAP 3E85 Runflat-tyre technology34 Introduction34 Runflat tyre (RFT)34 Tyre defect indicator36E85 Chassis- 1 -E85 ChassisIntroductionThe E85 chassis and suspension is based on the E46 chassis and suspension.The service
5、 brake with pedal assembly, brake hydraulics and brake calipers is essentially the same as the E46 service brake. Because of the widened track, the E85 has been given new brake discs with a different pot depth on the rear axle.In the USA, the function of Brake Force Display (the brightness of the br
6、ake lights is regulated as a function of deceleration) is offered.Front axleThe front axle for the E85 has been taken over from the E46. Steel transverse control arms are used only in cars fitted with the M54B22 engine and the GS5-20BG manual gearbox.Rear axleThe rear axle for the E85 is very simila
7、r to that of the E46. The roadster-adapted kinematics has resulted in several detail modifications:- The track width has been widened by 30 mm.- A reinforcement plate has been introduced to increase rigidity.- The rubber bearings on the axle bracket and on the trailing- arm bearings have been made h
8、arder.- The brake hoses and the signal cables for the brake-lining wear sensor and for the wheel-speed sensors are now routed on and underneath the trailing arms.- New mountings have been introduced on the trailing arms to facilitate routing of the brake hoses and the signal cables.E85 Chassis- 2 -S
9、pringing/dampingThe spring/damper set is the same in principle as that of the E46.- On the front axle, spring struts with coil springs and gas- pressure dampers are used.- On the rear axle, barrel springs and gas-pressure dampers are installed separately.- Ride levels are 10 mm lower compared with t
10、he E46.- Compared with the E85 standard suspension, ride levels of the sports suspension are a further 15 mm lower.SteeringBMW is deploying for the first time an EPS steering system (Electric Power Steering), which is described in a separate chapter.Wheels/tyresThe E85 is fitted as standard with run
11、flat tyres (RFTs) and a Tyre defect indicator (RPA). Both are described in a separate chapter.Cars with M54B22 and M54B25 engines are fitted as standard with 16 inch wheels. Cars with M54B30 engines are fitted as standard with 17 inch wheels.In addition to the 2 standard wheels, 5 assorted wheel sty
12、lings are available as options:- 1 optional styling for 16 inch wheels- 2 optional stylings for 17 inch wheels- 2 optional stylings for 18 inch wheelsE85 Chassis- 3 -BrakesIntroductionThe service brake (pedal assembly, brake hydraulics and brake calipers) is in principle the same as the service brak
13、e of the E46. On the rear axle, the E85 has been given new brake discs with a different pot depth on account of the widened track.The actuating unit of the parking brake is a new development. A mounting pan flanged to the floorpan accommodates an automatic cable adjuster with right/left cable equali
14、zation.New featuresWhat has been newly designed is the actuating unit of the parking brake with an automatic cable adjuster. A further innovation is right/left force equalization of both cables.E85 Chassis- 4 -System overviewFig. 1:Parking-brake actuating unit without cablesComponentsThe parking-bra
15、ke actuating unit consists of the following components:- Mounting pan- Automatic cable adjuster (ASZE unit)- Balance arm with mounting clip (cable mount)IndexExplanationIndexExplanation1Balance arm3ASZE unit2Mounting clip4Parking-brake warning witchKT-9887E85 Chassis- 5 -Mounting panThe mounting pan
16、 is flanged from below to the reinforcing plate of the parking-brake compartment. The reinforcing plate of the parking-brake compartment is secured to the left and right tunnel end sections.Fig. 2:Location of mounting pan with actuating unitThe mounting pan contains all the mechanical components of the parking-brake actuating unit. The cable guide tubes are permanently connected to the mounting pan. The cables are routed through the guide tub
