E46 series BMW 3

since 1998 of release

Repair and car operation

Check of the amplifier of a brake

Check operation of the amplifier of a brake if for achievement of necessary braking it is required to put excessively big effort to a brake pedal.

1 At the idle engine press a brake pedal not less than 10 times, then at the pressed pedal start the engine. Now the pedal of a brake should move noticeably. In this case the amplifier is serviceable.
2 Otherwise disconnect a vacuum hose at the amplifier and start the engine. Put a finger by the end of a hose and check, whether there is a vacuum.
3 If the vacuum is not present: Check a vacuum hose on tightness and existence of damages, if necessary replace it. Tighten fastening of all collars.
4 Diesel engine: Disconnect a vacuum hose from the vacuum pump and check a finger, whether there is a vacuum. The vacuum pump is fixed to a head of cylinders.
5 If the vacuum is available: Measure value of vacuum, if necessary replace the amplifier of a brake (work HUNDRED).

At the petrol engine surely replace also the return valve in the vacuum pipeline as the diaphragm in the amplifier of a brake at the faulty return valve owing to getting паров fuels can be damaged.