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2 Pad replacement
The ELSA 195 Air Disc Brake uses a device to monitor pad wear
(optional). The Device if fitted, is known as a PWWI (Pad Wear
Warning Indicator) and is fitted to the pad/s - Fig 6. If fitted, this
device will illuminate a warning lamp to indicate that a pad
change is required.
A - Pad replacement
Brake pad should be replaced when the lining thickness has
worn to 2.0 mm.
This will be indicated by the warning lamp of the PWWI if fitted.
Always replace brake pads in axle sets.
Park the vehicle on hard ground and chock the road wheels.
Apply air pressure and fully charge the system to ensure the park
brake is fully released. Wind off the spring brake retraction screw
(where appropriate). Jack up the axle and fit suitable axle stands
securely. Remove the road wheels and exhaust all air from the
system. Remove any dirt from the Brake assembly. Ensure the
rubber dust excluders fitted to the Piston Heads and guide
sleeves are not damaged.
CAUTION
Never use an airline to blow dust from the brake/rotor area.
If inhaled any form of dust can at best be an irritant, at
worst dangerous. Whenever possible remove dry brake dust
with a vacuum brush. Alternatively wipe the areas with a
damp cloth, never try to accelerate drying time by using an
airline.
B - Pad removal (with PWWI fitted)
Remove the pad retaining plate screw – Fig 7
Remove the pad strap from the slot in the housing casting but do
not attempt to remove it further at this stage.
Remove pad springs. Carefully remove both plastic blocks from
their location in the pads.
Do not use excessive force as this may result in damage. - Fig. 8
16
ArvinMeritor Air Disc Brake ELSA 195
Fig. 6
Fig. 7
Fig. 8
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