SECTION 12: BRAKE AND AIR SYSTEM
20
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.2 April 2016)
25.3.3 Continuous Wear Sensor.
These vehicles have a potentiometer installed
directly on the brake caliper.
Wear percentage can be consulted via the DID.
Access the « Brake Lining Remaining » MENU
Front axle
wear sensors are connected to
multiplex module
A44
.
Right hand
(curbside) wear sensors for both
rear axles are connected to
A50
Left hand
(road side) wear sensors for both rear
axles are connected to
A51
From the multiplex modules, the signal is sent to
Clever System’s IVN connection
Refer to wiring diagram for details
FIGURE 30: POTENTIOMETER
25.4
BRAKE PADS AND DISCS MINIMAL
TOLERANCE LIMITS
25.4.1 Brake Pads
The thickness of the pads must be checked
regularly dependent on the usage of the vehicle.
The pads should be checked corresponding to
any legal requirements that may apply. Even if a
wear indicator is fitted and connected, this must
be at least every 12 months.
FIGURE 31: MINOR BREAKOUTS AT THE EDGES ARE
PERMITTED
FIGURE 32: MAJOR BREAKOUTS ON THE SURFACE OF
THE BRAKE PAD ARE NOT PERMITTED
If the thickness of the friction material at its
thinnest point is less than 0.079 inch or 2 mm
(measurement C), the pads must be replaced.
A=
Overall thickness of new brake pad: 1.18
in (30 mm)
B=
Back plate SN7 type: 0.354 in (9 mm)
C=
Minimal thickness of friction material:
0.079 in (2 mm)
D= Minimum allowed thickness in worn
condition for back plate and friction
material: 0.433 in (11 mm)
FIGURE 33: BRAKE PAD DIMENSIONS
25.4.2 Brake Disc
Measure the thickness of the brake disc at the
thinnest point. Be aware of possible burring at
the edge of the disc.
E= Total thickness of the brake disc
New condition = 1.77 in (45mm)
Worn condition = 1.457 in (37mm) (the disc
must be replaced)
If the disc dimension E
≤
1.535 in (39mm),
it is recommended that the disc should be
renewed when the brake pads are
changed.
