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Wheel Brakes

Fig 1: Identifying Wheel Brakes
GLL140731Courtesy of VOLVO CARS CORPORATION
Number  Designation  Number  Designation 
1 Brake caliper 7 Bleed nipple
2 Holder 8 Piston
3 Rubber bushing 9 Brake fluid inlet
4 Sliding pin 10 Sealing ring
5 Brake pads 11 Dust boot
6 Brake hose - -

The vehicle has disc brakes on all four wheels to ensure optimum braking performance. The foot brake is combined with the parking brake on the rear axle.

The brake discs are ventilated on the front axle and are available in different diameters depending on engine type. There are three different types of rear brake discs.

The brake caliper (1) consists of two parts, housing and holder. The caliper grips across the disc brake and slides in the holder on two sliding pins (4). The sliding pins are greased and protected with a rubber bushing (3). The braking force from the brake pads (5) is absorbed via the holder (2), which transfers the force to the spindle.

The sliding pins are made of steel. They are screwed into the holder, which is secured to the stub axle.

The brake caliper contains a piston (8) together with a sealing ring (10) and dust boot (11). The piston cylinder is made of steel.

The piston presses directly on the internal brake pad. Based on the action-reaction principle, the caliper (1) presses backwards. Through this movement, the outer brake pad presses against the brake disc.