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1 Introduction
c) Manual adjustment and de-adjustment during a pad
change
Manual adjustment of the brake must only be made at a pad
change. No manual intervention is required between pad
changes.
A manual adjuster stem (17) runs in constant mesh with the gear
form on the outside of the tappets (34). The end of this stem
comes out from the brake housing through a seal (31) and is
protected further by an adjuster cap (33).
To increase the gap between the Piston Heads (7) and the bridge
(1) in order to fit new pads, remove the adjuster cap (33) and
rotate the shaft (17) in an anti-clockwise direction.
After fitting new pads an initial running clearance needs to be set
and some manual adjustment may be required. To reduce the gap
between the Piston Heads (7) and the bridge (1), remove the
adjuster cap (33), locate a 10mm socket on the adjuster stem
(17) and turn it clockwise viewed from the air actuator side.
Continue to adjust the brake until the pads lightly grip the rotor.
De-adjust the brake by 1/2 a turn of the spanner, this will give a
nominal 1mm pad to rotor clearance.
Ensure the rotor is free to turn. Replace the adjuster cap (33).
The automatic adjuster maintains a nominal pad to rotor
clearance between 0.5 to 1.0mm
Actuator
The ELSA 195 disc brake uses a 65 mm stroke actuator. - See
Fig. 5. - This actuator is supplied with a pushrod setting length of
15 mm
It is important the correct actuator is fitted, fitting an actuator with
a longer stoke, 76mm, is accompanied by a push rod length of
20 mm.
If an incorrect brake actuator is fitted, difference in push rod
length will result in partial application of the brake when the
actuator is bolted to the housing, this may lead to damage to the
Brake.
The actuator can be identified by part number on the actuator
nameplate.
76mm Stroke
Fig. 5
65mm Stroke
ArvinMeritor Air Disc Brake ELSA 195
13
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