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7
Construction and operation
7
FUNCTION
OPERATING PRINCIPLE: SLIDING CALIPER BRAKE
7.1 Applying the brake
During braking, the cylinder pushrod of the spring brake or diaphragm cylinder presses onto the brake lever (1).
The offset position of the brake lever amplifi es the force created by the brake cylinder and allows it to be trans-
ferred to the intermediate plate (2) with minimal loss via a needle bearing.
Mounted in the pressure plate (4), the intermediate plate counteracts the vertical movement of the lever and
ensures optimal transfer to the cross support.
The clamping force acts on the inner brake pad (7a) via the cross support (5) and the pressure plates (6).
Once the play between the inner brake pad and the brake disc (8) has been overcome, the reaction force is
transferred to the outer brake pad (7b) via the brake caliper.
The brake torque for the wheel is generated when the brake pads contact the brake disc. The radial stabilizer
force created by the responding brake pad at this time is transferred directly to the axle via the brake caliper.
7.2 Releasing the brake
When brake pressure rises, the pressure spring (9) moves the actuating unit back to its initial position.
7.3 Adjustment
The brake is fi tted with an automatic non-wearing adjusting device (10) to maintain constant clearance between
the brake pad and the brake disc.
Each time the brake is operated the axial movement of the intermediate plate (2) and pressure plate (4) causes the
adjuster pin (11)to be rotated via a trapezoidal thread.
The adjuster pin is connected to the threaded tube (14) by the movement thread (11a) which in turn can rotate
the threaded tube (14) via the spring loaded indented ball coupling sleeve (12). When play increases the threaded
tube (14) is turned correspondingly via the indented ball coupling (12). Axial play in the trapezoidal thread between
the pressure plate (4) and the adjuster pin determines the free play value of the disc brake.
When the free play is set correctly the spring loaded indented ball coupling sleeve (12) can disengage without
turning the threaded tube (14).
The overall play (total play on both sides of the brake disc) measures 0.7 to 1.3 mm.
1
2
3
4
7-1
14
13
12
10
11
9
5
(390)
7a
7b
(380)
8
Fig. 1
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