APRILIA RX 50 RACING - 2003 Manual page 57

From above, on the rear part, for rear brake cali-
◆
per.
The excessive wear of the friction mate-
rial would cause the contact of the pad
metal support with the disc, with conse-
quent metallic noise and production of sparks
from the caliper; braking efficiency, safety and
soundness of the disc would thus be negatively
affected.
If this groove is not visible any more (thickness of
the friction surface = 1,5 mm), change the pads.
√ For the front brake caliper have both pads
changed.
√ For the rear brake caliper, have both pads
of the caliper changed.
Fig. 58
57