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Replace a Spare part Brake Servo (Brake Booster) – a defective one or if the limit of use has been already reached. Find out useful information about Brake Servo (Brake Booster)

Brake gears booster is required to transmit the driver effort to press the brake pedal to all brake mechanisms of the wheels. As a rule, modern cars are equipped with hydraulic brake boosters, where a special brake fluid acts as the working part. Brake pedals, wheel brake cylinders, master brake cylinders, brake hoses and vacuum brake booster are the components of the hydraulic braking system. In order to slow down or stop the movement of the car, it is necessary to press the brake pedal. The force will be passed through the slide bar to the piston rod, referring to the master brake cylinder.

After this the piston presses on the brake fluid poured into the system. Brake fluid forwards force on the wheel brake cylinders through the fuel hoses. At the same time pistons in the brake cylinder, which press the brake pads, run forward. Due to this process pads are pressed against the brake discs or brake drums. The motion of the wheel gradually slows down, leading to a complete stop of the car. Modern hydraulic brake boosters consist of two independent circuits provided for each pair of wheels. It should be noted that the circuits can not connect the wheels of the same axle.

As for such car part as the vacuum brake booster, it is necessary to improve the operation of the entire brake system and insure the effort, made by the driver when braking, to be reduced. This booster is in conjunction with the master brake cylinder. The main part of the booster is a camera, which is divided into two parts with a rubber diaphragm. Because of the pressure drop and sufficient area of the diaphragm, it is possible significantly to reduce the pressure on the pedal. You can replace the broken part personally or in a repair shop. To save your money you can order all necessary parts, such as bumper, sidewall or expansion valve in our online shop.

Brake Servo (Brake Booster) for AUDI A4 Avant (8E5, B6), VOLVO V70 II (SW), VOLVO V70 II (SW)

Faults of brake servo
  • system leakage;
  • faulty hoses and connections;
  • mechanical damage to the body;
  • displacement or damage to the diaphragm;
  • damage or displacement of rubber seals;
  • failure of valves;
  • wedging of components.
Symptoms of brake servo faults
  • pull to one side when braking;
  • too high position of the brake pedal in normal mode;
  • different stiffness of the brake pedal when driving and during stops;
  • appearance of strange sounds in the brake system when braking;
  • low effectiveness of the brakes;
  • vibrations or beating in the brake pedal while pushing.
Causes of faulty brake servo
  • increase in the play between the elements of the part;
  • looseness of connections;
  • use of low-quality spare parts;
  • use of parts and consumables mismatching a particular vehicle model;
  • pushrod offset;
  • loosening or breakage of clamps.
Diagnostics

Analysis of the brake servo can be carried out independently. To do this, press the brake pedal 5-7 times with the engine off. Listen carefully to the sounds. A quiet hiss of the air means that the servo leaks.

After pumping the brakes start the engine. During the ignition starting the pedal should go forward 1-2 cm. If it remains in the same position, it is necessary to conduct a more detailed diagnosis in a service shop.

Then you can carry out another test. Depress the brake pedal until it stops with the engine running. Then stop it, but continue to hold the pedal for 1-2 minutes. When air pipes are damaged and system leaks, back pressure in the pedal and effort for its retention will be significantly increased.

Repair and replacement of the brake servo

Repair of the part is carried out only for minor injuries of diaphragm or valves. However, it involves the use of only original parts. You can use the universal parts, but they require separate testing for compatibility.

Damaged casing or a more serious fault require only replacement of the element.

Before removing the brake servo you must stop the engine. For greater convenience we recommend to fix the car on a lift platform. First, you need to disconnect the push rod from the brake pedal. It is located under the steering shaft. Be careful not to damage the related mechanisms.

Next, unscrew the fastening and remove the brake master cylinder. The last step is to disconnect the vacuum hose from the valve. You can then completely remove the part and install a new one.

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