E39 series BMW 5

since 1996-2001 of release

Repair and car operation



E39 BMW
+ Introduction
+ Maintenance instruction
+ Current leaving and service
+ Engine
+ Systems of cooling, heating
+ Power supply system and release
+ engine Electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
- Brake system
   Anti-blocking system
   Removal and installation of forward 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
   Brake liquid
   Air removal from 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
+ Body
+ Onboard electric equipment
+ electric equipment Schemes
+ System of onboard diagnostics





Anti-blocking system

The anti-blocking system (ABS) consists of the electrohydraulic control unit with the built-in electronic device, a control lamp of ABS and sensors of number of the turns established on wheels.
ABS interferes with blocking of wheels at sharp braking. Thanks to it at complete braking the car remains operated. The driver feels ABS action on a pulsation of a brake pedal and on hydrounit noise in an impellent compartment.

Protection in the electronic control unit watches that in the presence of defect (for example, cable break) or at decrease in feeding tension of the storage battery is lower 10.5 In ABS was independently disconnected. It is displayed by fire on the dashboard of a control lamp of ABS. The usual brake system thus continues to work. The car when braking behaves so as if ABS is not present.
After inclusion of ignition of ABS makes self-diagnostics. Approximately through 3 with a control lamp dies away. If it burns more long or lights up during movement, it is necessary to pay attention to the following:
   a) Stop the car, switch off the engine and again start it.
   b) Check tension of the storage battery. If it makes less than 10.5 In, charge the battery.
   c) Check, whether contact of wires to a battery room of batteries is reliable.
   d) Lift and establish the car on supports. Remove wheels. Check existence of damages of electric wires. More serious check of ABS should be carried out by experts. By means of the special device of malfunction can be считаны from memory and are eliminated.

Before carrying out electrowelding works it is necessary расстыковать shtekerny connection of the electronic ABS control unit. Connection undocks only at the switched-off ignition. At performance of painting works it is impossible to subject the control unit to temperature influence above +85°С.

ASC+Т system

The ASC+Т system (system of stabilization of stability and automatic adjustment of traction effort of the engine) interferes with a probuksovyvaniye of back wheels at increase in gas, for example on the road with a wet covering as the revolving wheel cannot create a sufficient motive power and coupling with the road. The considered system is built in the ABS control unit.

The control unit receives information on angular speed of wheels from sensors of wheels which are at the same time used as ABS sensors. If the back wheel starts to revolve, сиcтема DME (an electronic control system of the engine) receives information from the ABS/ASC+T control unit. The DME system reduces engine capacity by management of injectors. The ignition moment in addition can change. The effect of management is thus similar to an otpuskaniye the driver of a pedal of gas. Engine capacity quickly decreases, wheels stop to revolve. If it is not enough of it, the monitoring system of traction effort подтормаживает revolving driving wheels. Action of 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. Till speed of 40 km/h the monitoring system of traction effort creates differential blocking. As the left and right wheel подтормаживаются independently from each other, ASC+T system operates as blocking differential with efficiency of blocking about 100 %.

The ASC+T system registers malfunctions in the work. After ignition inclusion on the dashboard quickly lights up and the control lamp dies away. If the lamp does not die away or burns during movement, it indicates existence of malfunctions in system. The car can move further, but the ASC+T system does not work.

At movement with snow chains on deep snow or at a troganiye from a place from deep dirt it is expedient to disconnect ASC+T system the switch located on the central console. To include system it is possible the same switch. At the following start of the engine the system joins.