BMW 5 Series E39
since 1996-2001 release
Repair and operation of the car
+ Maintenance instruction
+ Current leaving and service
+ Cooling systems, heating
+ Power supply system and release
+ Engine electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
- Brake system
Removal and installation of front brake shoes
Removal and installation of a brake disk/support of a forward brake
Removal and installation of back brake shoes
Removal and installation of back brake supports
Removal and installation of a brake disk of back wheels
Measurement of thickness of a brake disk
Removal of air from the brake system
Replacement of brake pipelines
Replacement of a forward brake hose
Check of the vacuum amplifier of a brake
Removal and installation of brake shoes of the parking brake
Adjustment of the parking brake
Removal and installation of the lever of the parking brake
Removal and installation of a cable of the parking brake
Check and replacement of the switch of a stoplight
+ Suspension bracket and steering
+ Onboard electric equipment
+ Schemes of electric equipment
+ System of onboard diagnostics
The anti-blocking system (ABS) consists of the electrohydraulic control unit with the built-in electronic device, control lamp of ABS and sensors of speed installed on wheels.
Protection in an electronic control unit watches that it with defect (for example, break of a cable) or at decrease in the feeding tension of the rechargeable battery lower than 10.5 B ABS independently was turned off. It is displayed by fire on the dashboard of a control lamp of ABS. The ordinary brake system at the same time continues to work. The car when braking behaves so as if there is no ABS.
The ASC+T system (system of stabilization of stability and automatic adjustment of traction effort of the engine) interferes with skidding of back wheels at increase in gas, for example on the road with a wet covering as the revolving wheel cannot create sufficient driving force and coupling with the road. The considered system is built in the ABS control unit.
The control unit obtains information on the angular speed of wheels from sensors of wheels which are at the same time used as ABS sensors. If the back wheel begins to revolve, DME system (an electronic control system of the engine) obtains information from the ABS/ASC+T control unit. The DME system reduces engine capacity by management of injectors. In addition the ignition moment can change. The effect of management at the same time is similar to an otpuskaniye the driver of the accelerator pedal. Engine capacity quickly decreases, wheels stop revolving. If it is not enough, control system of traction effort applies brakes partially the revolving driving wheels. Action of the ASC+T system is displayed on the dashboard by a blinking of a control lamp.
In system there is an adjustment of traction effort. It interferes with short-term blocking of driving wheels on an equal paving thanks to brake operation of the engine. To the speed of 40 km/h the control system of traction effort creates blocking of differential. As the left and right wheel are applied brakes partially independently from each other, ASC+T system works as the blocking differential with efficiency of blocking about of 100%.
The ASC+T system registers malfunctions in the work. After inclusion of ignition on the dashboard the control lamp quickly lights up and dies away. If the lamp does not die away or burns during the movement, then it indicates existence of malfunctions in system. The car can move further, but the ASC+T system does not work.
At the movement with snow chains on deep snow or at start-off from the place from deep dirt it is expedient to disconnect the ASC+T system the switch located on the central console. It is possible to include system the same switch. At the following start of the engine the system joins.