Derbi boulevard 125 4t Workshop Manual page 170

Braking system
Locking torques (N*m)
Screw tightening calliper to the support 20 ÷ 25 Pad fastening pin 19.6 ÷ 24.5
Fill
Front
-Once the bleed valve is closed, fill the system with
brake liquid to the maximum level.
-Undo the bleed screw.
-Apply the tube of the special tool to the bleed
screws.
When bleeding it is necessary to fill the oil tank in
continuation while working with a MITYVAC pump
on the bleed screws until no more air comes out of
the system.
The operation is finished when just oil comes out
of the bleed screws.
-Do up the bleed screw.
-When the operation is over, tighten up the oil
bleed screw to the prescribed torque.
N.B.
IF AIR CONTINUES TO COME OUT DURING
PURGING, EXAMINE ALL THE FITTINGS:
IF SAID FITTINGS DO NOT SHOW SIGNS OF
BEING FAULTY, LOOK FOR THE AIR INPUT
AMONG THE VARIOUS SEALS ON THE PUMP
AND CALLIPER PISTONS.
CAUTION
- DURING THE OPERATIONS, THE VEHICLE
MUST BE ON THE STAND AND LEVEL.
N.B.
DURING PURGING FREQUENTLY CHECK THE
LEVEL TO PREVENT AIR GETTING INTO THE
SYSTEM THROUGH THE PUMP.
WARNING
- BRAKING CIRCUIT FLUID IS HYGROSCOPIC.
IT ABSORBS HUMIDITY FROM THE SUR-
ROUNDING AIR.
IF THE LEVEL OF HUMIDITY IN THE BRAKING
FLUID EXCEEDS A GIVEN VALUE, BRAKING
EFFICIENCY WILL BE REDUCED.
THEREFORE, ALWAYS USE FLUID FROM
SEALED CONTAINERS.
BRAK SYS - 170