Ken-tool Bendix ADB22X-V Air Disc Brakes Manuel d'utilisateur télécharger pdf (Page 3)

1.3 Rotor identiﬁ cation

See Figure 4 to help you identify which type of rotor is used

on the axle being inspected. Note that the maintenance

inspection procedure will depend on the type of rotor

installed.

Conventional

Rotor

Bendix

Splined

Disc

Rotor

FIGURE 4 - ROTOR IDENTIFICATION

CAUTION: Rotors may not be mixed on a single axle:

axles are only permitted to have all conventional or all

splined disc rotors.

1.4 Wear Sensor Identiﬁ cation

See Figure 5 for the electronic wear sensor that may be

present.

Sensor . . . . . . . . . . . . . . . . . . . . . 101

Cable to Electrical Supply. . . . . . . 103

Cable Protection Plate . . . . . . . . . 104

Cable Guide (two designs) . . . . . . 105

103

Cable to Electrical

Supply

104

Cable Protection

Plate

101

Sensor

101

Sensor

105

Cable Guide

(2 alternate

designs used)

Consult the instruction sheet included with wear

indicator kits for installation information.

FIGURE 5 - ELECTRONIC WEAR INDICATOR COMPONENTS

1.5 Operation

Bendix air disc brakes convert air pressure into braking

force. (See Figure 6.) When the vehicle brakes are

applied, air enters the service brake chamber through

the supply port, applying pressure within the diaphragm.

The pressure expands the diaphragm — applying force

to, and moving, the pressure plate and push rod forward.

The push rod acts against a cup in the internal lever which

pivots on an eccentric bearing moving the bridge. Moving

against a return spring, the bridge transfers the motion to

two threaded tubes and tappets, which move the inner

brake pad. The inner brake pad (from its normal position

of having a running clearance between it and the rotor)

moves into contact with the brake rotor. Further movement

of the bridge forces the caliper — sliding on two stationary

guide pins — away from the rotor. That, in turn, pulls the

outer brake pad into the rotor. The clamping action of the

brake pads on the rotor applies braking force to the wheel.

Supply Port

Return Spring

Push rod

Lever

Outer Brake

Pad

Inner Brake Pad

Rotor

Eccentric Bearing

Service Brake

Chamber

Bridge

Pressure

Plate

Diaphragm

FIGURE 6 - CROSS-SECTION VIEW SHOWING BRAKE

OPERATION

1.5.1 Brake Release and Adjustment

When the vehicle brakes are released, the air pressure

in the service brake chamber is exhausted and the return

springs in the chamber and the bridge return the air disc

brake to a neutral, non-braked position. To maintain the

running clearance gap between the rotor and the brake

pads over time, the non-braked position is mechanically

adjusted by a mechanism in the caliper. The adjustment

mechanism operates automatically whenever the brakes

are activated, to compensate for rotor and brake pad wear

and to keep the running clearance constant. During pad

or rotor maintenance, the technician manually sets the

system’s initial non-braked position. The total running

clearance (the sum of clearances on both sides of the

rotor) should be between 0.024 to 0.043 in. (0.6 to 1.1 mm).

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Ken-tool Bendix ADB22X-V Air Disc Brakes Manuel d'utilisateur Page 3

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