Gilera Runner RST 50 SP, Service Station Manual, Page: 111 / 183

pressed air through the brake fluid pipe in order to
facilitate the expulsion of pistons (6).
5) Check:
- that the plates and the body are whole and in
good condition;
- that the cylinder and the floating body of the cal-
liper do not show signs of scratches or erosion,
otherwise replace the entire calliper;
- that the guides of the fixed plate are not scratched
or eroded, otherwise replace the entire plate;
- that the brake pad check spring works properly.
Reassembly
1) insert the pistons (6) and the sealing rings (7) in
the body;
2) place the guide rubbers (8) and refit the fixed
plate (4);
3) assemble the reaction plate (3) tightening the
screws (2), insert the brake pad check spring (9)
and then the pads, fixing them with the corre-
sponding screws (1);
5) place the calliper on the disc and lock it to the
strut by tightening the fixing screws;
6) fix the pipe joint on the calliper at the prescribed
torque.
Functioning
This is a floating type calliper.
It takes advantage of the action and reaction prin-
ciple to obtain the thrust for both pads.
The body and the reaction plate body work inte-
grally and can move axially with respect of the
fixed plate that is integral to the strut.
The pistons, forced by pressure to push the pad to
the disk, cause the reaction plate to push in turn
the other pad towards the disc.
The brake pad lock spring
1. Pad fixing screws
2. Reaction plate fixing screws
3. Reaction plate
Runner RST 50 SP
Braking system
BRAK SYS - 111