Disc brake, function

B42.10-0416-09

1 Brake caliper.

2 Brake caliper fastening support

4 Rubber bushing side guide pin

4c Sliding bearing guide pin (works with the type “1” rubber bushing)

5 Fixed bearing guide pin (works with the bronze bushing (7))

6A005 Type “2” rubber bushing of the SB7000 sliding brake caliper

6B “DU” bushing of the SN7000 sliding brake calipers

7 Fixed bearing bronze bushing

9 Protector bellows of the sliding bearing

10 Metal lid

11 Pad retainer

12 Complete brake pads

13 Pressure piece with theprotector bellows

16 Threaded tube

16.1 Bushing of the pressure piece

17 Actuation bridge

18.1 Combined cylinder (actuator)

18.2 Diaphragm cylinder (actuator)

19 Actuating lever

20 Support bearing

22 Internal protector bellows

23 Clearance adjuster

24 Pusher

26 Pad retainer pin

27 Compression spring

30 Control chain

32 Chain wheel

33 Wear sensor

37 Adjuster cover

39 Brake caliper bolt

40 Caliper's microencapsulated bolt

43 Cylindrical head bolt

44 Pads clip lock pin.

45 Washers

46 Brake disc

58 Protection ring of the protector bellows

61 Clearance adjuster adapter

68 Metal lid

Brake action

During the actuator rod action (18.1) or (18.2) moves the lever (19). The input forces are transferred by the eccentric bearing (20) to the bridge (17). The force is then distributed by the bridge (17) and the two threaded tubes (16) to the pressure pieces (13) and finally to the inner pad.

After overcoming the operation clearance between the pads and the disc, the reaction forces are transmitted to the outer pad (12). The closing force on the pad (12) and disc (46) generates the braking force to the wheel.

Brake relief

After releasing the air pressure, the return spring (27) displaces the bridge (17) and the lever (19) back to the initial position; this ensures that the brake pads operation clearance will be maintained.

Brake adjustment

The brake is equipped with a low wear automatic adjustment mechanism to ensure the constant operation clearance between the disc and the pads. The clearance adjuster (23) operates with each brake action cycle due to the mechanic connection with the lever (19). As the pads and discs get worn, the operation clearance increases. The adjuster (23) and the drag device (24) turn the threaded tubes (16) as necessary to compensate the wear.

The total operation clearance (clearance sum of both disc sides) will have to be between 0.6 and 1.1mm; smaller clearances may cause overheating problems.