The components of the braking system. Volkswagen Passat B6 (from the year 2004)

Pressure Regulator limits the output pressure to the rear brakes after the pressure reaches the limit value in the master cylinder. The controller is used when necessary to use a smaller force to the rear brake mechanisms to achieve optimum braking.

Brake fluid level sensor located in the tank for brake fluid warning lamp BRAKE if a low brake fluid level. As soon as the fluid level reaches the desired level, BRAKE extinguished.

Vacuum brake booster reduces the force on the brake pedal, making it easier to drive the car. The iris servo is used, which under normal operating conditions on both sides of the vacuum. During braking on one side of the diaphragm air is supplied, thereby to atmospheric pressure. Due to the pressure differential transferred through the aperture, the plunger moves towards the vacuum (or vacuum), providing a supporting force for braking. When the brake pedal is released, the air is evacuated from the cavity of the amplifier through a check valve and a vacuum is created.

The main brake cylinder is designed for use on dual-circuit brake system. The front brakes and rear left brake actuated by the primary piston and the front left brake and rear right brake actuated by the secondary piston. The main brake cylinder combines the functions of the standard dual master cylinder, as well as an indicator of low brake fluid level and pressure regulator in the brake system.

ATTENTION

Replace all the parts included in the repair kits used to service the master cylinder.

At installation grease rubber parts with clean brake fluid to ease assembly. Do not use shop air to dry and clean parts of the brake mechanism. This can damage rubber parts. If any part of the hydraulic system remove or disconnect completely bleed the brake system.

Tightening torque is set for dry, unlubricated fasteners.

Follow all maintenance work on a clean bench, free from mineral oil stains.

The caliper brake is mounted on the steering knuckle with two bolts. The liquid pressure generated by pressing the brake pedal is converted into braking force. This force acts equally on the piston and caliper. As a result, the piston is pushed out, and the caliper is moved inside, clamping the brake disc. When compression of the frictional force generated between the friction linings of brake pads and brake discs, which helps stop the car.

ATTENTION

Always replace all the pads on the same axle of a vehicle, even if only one shoe is worn. If the brake pads are installed again, before removing their need to mark.

When you press the brake pedal brake fluid pressure on the piston, moving it from the cylinder. Gland piston under the action of considerable pressure on the piston is moved together with the cylinder. However, since the oil seal portion of the piston is fixed in a groove conforming to a shape of the seal, the upper part of the gland is deformed in the direction of movement of the piston.

When releasing the brake pedal, the brake fluid pressure is reduced and the elastic force created by the deformation of the gland piston, the piston returns to its original position.

As the brake pads wear and increasing the clearance between the brake disc and pads the piston moves further, thereby maintaining the same gap. Gland hereinafter may vary in shape, but since the inner part of the gland is fixed in the groove of the cylinder, the deformation amount is the same. The piston moves further to overlap the gap distance. As the piston is returned by the same distance, and a rubber oil seal piston returns to its original position, the clearance between the brake disc and brake lining is supported at a desired level.