BMW 5 Series E39

since 1996-2001 release

Repair and operation of the car



BMW E39
+ Introduction
+ Maintenance instruction
+ Current leaving and service
+ Engine
+ Cooling systems, 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 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
   Brake fluid
   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
+ Body
+ Onboard electric equipment
+ Schemes of electric equipment
+ System of onboard diagnostics





Check of the vacuum amplifier of a brake

If for achievement of necessary brake effort it is necessary to make considerable effort for a brake pedal, it is necessary to check the vacuum amplifier of a brake.

 PERFORMANCE ORDER

1. Press a brake pedal at the idle engine not less than 10 times. Then, without releasing a pedal, start the engine. At the same time brake pedal pressure under effort of a leg has to weaken. In this case the vacuum amplifier is serviceable.
2. Otherwise disconnect a vacuum hose from the amplifier and start the engine. Apply a finger to the end of a vacuum hose and check whether there is a vacuum.
3. If there is no vacuum: Check tightness of a vacuum hose and existence of damages. If necessary replace. Tighten all collars.
4. Diesel engine: Disconnect a vacuum hose from the vacuum pump and check a finger vacuum availability.
5. If vacuum is: Measure value of vacuum. If necessary replace the vacuum amplifier (work HUNDRED).

At the same time surely replace the backpressure valve in the vacuum pipeline since the diaphragm in the amplifier can be damaged owing to penetration of vapors of fuel (at the petrol engine and the damaged backpressure valve). Shooters on the backpressure valve have to specify in the direction of the inlet pipeline.





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