APRILIA Tuono 660 2021 Service Station Manual page 336

Braking system
ABS SYSTEM DESCRIPTION
The ABS system is a device to avoid wheels locking in case of emergency braking, increasing vehicle
braking stability when compared to a traditional braking system.
The ABS system improves vehicle control provided that the physical limits of vehicle grip on the road
are not exceeded. The rider is fully responsible for riding at a suitable speed based on weather and
road conditions, always leaving an appropriate safety margin. Under no circumstances can the ABS
system compensate for the rider's misjudgement or improper use of brakes.
Sometimes when the brake is operated, the tyre locks with a consequent loss of grip, which makes it
difficult to control the vehicle.
A position sensor (3) on the tone wheel (2), forming an integral unit with the vehicle wheel, "reads" the
status of the vehicle wheel spotting any possible lock.
A control unit (1) signals this out and adjusts the pressure in the braking circuit accordingly.
CAUTION
WHEN THE ABS STARTS WORKING, A VIBRATION IS FELT ON THE BRAKE LEVER.
THE WHEEL ANTILOCK BRAKING SYSTEM DOES NOT PREVENT FALLS WHILE ON A BEND.
AN EMERGENCY BRAKING WITH THE VEHICLE INCLINED, HANDLE BAR TURNED, ON UN-
EVEN OR SLIPPERY ROADS, OR WITH POOR GRIP CREATES LACK OF STABILITY DIFFICULT
TO HANDLE. THEREFORE, RIDE CAREFULLY AND SENSIBLY AND ALWAYS BRAKE GRADU-
ALLY. BRAKING WHILE TURNING A CORNER IS SUBJECT TO LAWS OF PHYSICS WHICH NOT
EVEN ABS CAN ELIMINATE.
Modulator
ABS MODULATOR REPLACEMENT
To replace the ABS modulator it is necessary to
remove the fuel tank, the radiator, the side panels,
the internal side panels, the side fairings, the rear
mudguard, the control unit and its support. Then
proceed as described:
BRAK SYS - 336
RS 660 - Tuono 660