BMW 7_ая the E38 series from 1994 to 2002
1. Introduction
2. Governing bodies and operation receptions
3. Settings and routine maintenance of the car
4. Engine
5. Systems of cooling of the engine, heating, ventilation and air conditioning
6. A power supply system and production of the fulfilled gases
7. Systems of electric equipment of the engine
8. Manual box of gear shifting and coupling
9. Automatic transmission
10. Kardanny and power shafts, reducer, differential and stupichny assemblies
11. Brake system
12. Suspension bracket and steering
12.1. General information, recommendations and security measures
12.2. Forward suspension bracket
12.3. Back suspension bracket
12.4. EDC system
12.5. Steering
13. Body
14. Onboard electric equipment
15. Electric equipment schemes



12.1. General information, recommendations and security measures

Forward suspension bracket

The independent suspension bracket of forward wheels on double levers, aluminum, has a beam connected with a body through rubber support. The forward beam via cross-section levers and drafts is connected with rotary fists. The amortization racks connected by bolts with a body and rotary levers, consist of a screw spring and the gas-filled shock-absorber. The stabilizer of cross-section stability counteracts a body inclination on turns and promotes the best contact of forward wheels to the road.

Back suspension bracket

Details of a back suspension bracket

1 — the Shaking lever
2 — the Beam
3 — the Forward hinge of fastening of a reducer
4 — Back hinges of fastening of a reducer

5 — the Cross-section lever
6 — the beam Hinge
7 — the Extension
8 — the Integrated lever

The back suspension bracket represents a multilever design with a stretcher and double elastic fastening of the main transfer. Wheels go four cross-section levers, is elastic connected with a stretcher. A stretcher it is also elastic it is connected with a body. Besides, levers and driving wheels are geometrically located in such a manner that they together with rezinometallichesky support create effect of a joint management of back wheels and provide precisely calculated fine tuning of an angle of rotation of back wheels. It gives a prize in traffic safety in any situations.

The system of electronic control by rigidity of the shock-absorbers (EDC), delivered as an additional complete set, practically without a delay adapts rigidity of shock-absorbers for changing road conditions. All changes of speed, vertical acceleration of a body, pressure of braking, loading of the car, an angle of rotation of a steering wheel and the provision of a pedal of gas are constantly supervised by the corresponding sensors. On the basis of the received data the electronic block develops signals for management of shock-absorbers, regulating their rigidity by means of Ý/m valves.

As forward and back suspension brackets are executed completely from aluminum, it is necessary to observe the following:

  • Do not allow contact of a suspension bracket to electrolit of the storage battery;
  • To cleaning of a suspension bracket apply only a brush from corrosion-proof became (not from steel or brass);
  • When polishing, are sharp and to welding close suspension bracket elements from hit of sparks;
  • Do not subject suspension bracket elements to influence of temperatures above 80 °C. Influence of temperature of the painting chamber is admissible.

Details of a steering drive

1 — the Pendular lever
2 — the Plug

3 — Soshka
4 — Average draft
5 — the Right and left lateral drafts

Details and GUR lines

1 — the Pump GUR
2 — a GUR liquid Radiator

3 — the Steering mechanism
4 — the GUR liquid Tank
D — Sealing rings

The steering consists of a steering wheel, a steering shaft, the steering mechanism of type «the screw – a ball nut» and a steering drive. The steering wheel with the built-in forward safety cushion of the driver fastens on a shaft which transfers operating movements to the steering mechanism. The power steering (GUR) is applied to simplification of driving. GUR consists of the pump, the tank, hydraulic lines and a radiator of working liquid. The pump GUR is given through a multiridge belt, soaks up GUR liquid from the tank and submits it under pressure to the steering mechanism where the adjusting element of the hydraulic booster settles down. The principle of work of GUR is considered in the Section Steering.

At performance of repair or service of components of a suspension bracket and a steering often there are problems with an otvorachivaniye of the "become attached" bolts and nuts. Located under the car bottom fixture elements constantly are exposed to external influences and over time are exposed to corrosion and partially collapse. Application of a brute force at an otpuskaniye of such "become attached" fixture is interfaced to risk of its damage. For a start moisten an element not giving in to an otvorachivaniye with a small amount of special getting liquid, having allowed it it is good to impregnate a rust layer. With a wire brush remove external deposits from available sites of carving surfaces. Sometimes the sharp blow a hammer on a nut through a drift helps to destroy a rust filling gaps between rounds of a carving joint, - try not to allow carving damages as a result of a drift soskakivaniye. Use at an otdavaniye of the "become attached" fixture long the vorotka allows to increase considerably an enclosed torque, however it is necessary to remember that use of extension pieces complete with drives of ratchet type is interfaced to risk of failure of the returnable mechanism, and also with possibility of receiving a trauma. The fixture damaged in the course of an otpuskaniye is subject to replacement without fail.

As the majority of procedures described in the present Chapter is made on the car lifted over the earth, it is necessary to take care beforehand of options of its reliable fixing in the lifted situation, – prepare strong props. For a poddomkrachivaniye of the car use hydraulic jacks of podkatny type, – remember that the onboard jack entering into a standard complete set is intended only for a temporary poddomkrachivaniye of the car at replacement of the failed wheel. The hydraulic jack can be used also for posting of some components of a suspension bracket at performance of this or that procedure.

Work under the car withheld in lifted situation only by means of jacks is not allowed!

Carrying out welding and rikhtovka of bearing elements of a suspension bracket, and also elements of a steering is not allowed. Самоконтрящиеся and the fixture damaged by corrosion in the course of repair it is necessary to replace nuts.

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12.2. Forward suspension bracket