APRILIA Tuono 660 2021 Service Station Manual page 82

Maintenance
CAUTION
AVOID PROLONGED AIR EXPOSURE OF THE BRAKE FLUID. BRAKE FLUID IS HYGROSCOPIC
AND ABSORBS MOISTURE WHEN IN CONTACT WITH AIR. LEAVE THE BRAKE FLUID RESER-
VOIR OPEN ONLY FOR THE TIME NEEDED TO COMPLETE THE TOPPING-UP PROCEDURE.
TO AVOID SPILLING FLUID WHILE TOPPING UP, KEEP THE LEVEL OF THE FLUID IN THE RES-
ERVOIR PARALLEL WITH THE EDGE OF THE RESERVOIR ITSELF (IN HORIZONTAL POSITION).
DO NOT ADD ADDITIVES OR OTHER SUBSTANCES TO THE FLUID. FUNNELS OR ANY OTHER
IMPLEMENTS USED MUST BE PERFECTLY CLEAN.
BRAKE FLUID IS HIGHLY CORROSIVE. AVOID CONTACT WITH THE SKIN, EYES AND PARTS
OF THE MOTORCYCLE.
WHEN TOPPING UP, PROTECT PARTS OF THE MOTORCYCLE IN THE VICINITY OF THE RES-
ERVOIR WITH ABSORBENT MATERIAL.
Recommended products
DOT 4 brake fluid Synthetic brake fluid.
SAE J 1703; FMVSS 116; ISO 4925; CUNA NC 956 DOT4
Front braking system
•
Use a short cross-head screwdriver to
undo the screws (1) of the front braking
system fluid reservoir (2).
•
Lift and remove the cover (3), complete
with screws (1) and the gasket (4).
•
Top up the reservoir (2) with recom-
mended brake fluid to above the mini-
mum level marking "MIN".
CAUTION
ONLY FILL TO THE "MAX" LEVEL AFTER FITTING NEW
BRAKE PADS. DO NOT FILL TO THE "MAX" LEVEL WITH
WORN PADS, AS THIS WILL CAUSE FLUID TO ESCAPE
WHEN REPLACING BRAKE PADS.
CHECK BRAKING EFFICIENCY.
IF THE DEAD ZONE OF THE BRAKE PEDAL OR BRAKE
LEVER IS TOO LONG, OR IN CASE OF FLUID LOSS, IT
MAY BE NECESSARY TO BLEED THE AIR TRAPPED IN
THE SYSTEM.
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RS 660 - Tuono 660