APRILIA RS 125 Euro 4 Service Manual page 301

RS 125 - Tuono 125 - Euro 4
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Measure the thickness of the brake pads. If either one is under the service limit, replace
them.
Service limit 1.5 mm (0.05 in).
WARNING
IF THE BRAKE LEVER IS OPERATED WITH THE CLAMP EXTRACTED IT MIGHT BE NECESSARY
TO CARRY OUT THE CORRESPONDING BLEEDING.
Bleeding the braking system
NOTE
IF AIR CONTINUES TO COME OUT DURING THE BLEED OPERATION EXAMINE ALL THE FIT-
TINGS:
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 THESE OPERATIONS, THE VEHICLE MUST BE UPRIGHT.
NOTE
DURING THE BLEEDING OPERATIONS FREQUENTLY CHECK THE LEVEL TO PREVENT AIR
GETTING INTO THE SYSTEM THROUGH THE PUMP.
WARNING
BRAKE FLUID IS HYGROSCOPIC; IT TENDS TO ABSORB MOISTURE FROM THE SURROUND-
ING AIR.
IF THE LEVEL OF MOISTURE IN THE FLUID EXCEEDS A GIVEN VALUE, BRAKING EFFICIENCY
WILL BE REDUCED.
THEREFORE, ALWAYS USE FLUID FROM SEALED CONTAINERS.
UNDER NORMAL DRIVING AND CLIMATIC CONDITIONS YOU SHOULD CHANGE THIS LIQUID
EVERY TWO YEARS.
IF THE BRAKES ARE USED INTENSELY AND/OR IN HARSH CONDITIONS, CHANGE THE FLUID
MORE FREQUENTLY.
CAUTION
WHEN CARRYING OUT THE OPERATION, BRAKE FLUID MAY LEAK FROM BETWEEN THE
BLEED SCREW AND ITS SEAT ON THE CALLIPER. CAREFULLY DRY THE CALLIPER AND DE-
GREASE THE DISC SHOULD THERE BE OIL ON IT. WHEN THE OPERATION IS OVER, TIGHTEN
THE OIL BLEED SCREW TO THE PRESCRIBED TORQUE.
CAUTION
MAKE SURE THE BRAKE FLUID DOES NOT GET INTO YOUR EYES OR ON YOUR SKIN OR
CLOTHES. IF THIS HAPPENS ACCIDENTALLY, WASH WITH WATER.
WARNING
BRAKE CIRCUIT FLUID IS VERY CORROSIVE; DO NOT LET IT COME INTO CONTACT WITH THE
PAINTED PARTS.
Front
Any air trapped in the hydraulic circuit acts as a cushion, absorbing much of the pressure applied by
the brake pump and minimising the braking power of the calliper.
The presence of air is signalled by the "sponginess" of the brake control and poor braking efficiency.
CONSIDERING THE DANGER FOR VEHICLE AND RIDER, IT IS STRICTLY NECESSARY, AFTER
REFITTING BRAKES AND RESTORING THE BREAKING SYSTEM TO ITS REGULAR USE CON-
DITIONS, THAT THE HYDRAULIC CIRCUIT BE AIR PURGED.
Braking system
BRAK SYS - 301