Bleeding The Rear Brake System - APRILIA SXV / RXV 450 550 Use And Maintenance Book

MAINTENANCE
3.4.2.

BLEEDING THE REAR BRAKE SYSTEM

The air, if any, present inside the hydraulic circuit will serve
as "pad" by absorbing most of the pressure coming from the
brake master cylinder and thus reducing the caliper
efficiency during braking.
If some air is present inside the circuit, the brake control is
"spongy" and the braking efficiency is reduced.
DANGER
It is fundamental that air is bled off the
hydraulic circuit after the brakes have been
refitted and the braking system has been
restored to its standard operating conditions,
since it would be very dangerous for the vehicle
and the rider not to do so.
NOTE Bleed air with
While bleeding the hydraulic circuit, top up reservoir with
brake fluid as required. Make sure there is always some fluid
in the reservoir throughout the process.
• Remove the bleed valve rubber cap.
•
Insert one end of a transparent plastic tubing inside the
rear brake caliper bleed valve and the other end in a
container for collection.
•
Pull and quickly release the rear brake lever a few
times, then keep it pulled.
•
Loosen the bleed valve by 1/4 of a turn so as the brake
fluid flows in the container,
tension from the lever and help it travel fully home.
•
Retighten the bleed valve before the lever is fully
squeezed in.
•
Repeat process until the fluid draining into the
container is totally clear of air bubbles.
NOTE While bleeding the hydraulic circuit, top up reservoir
with brake fluid as required. Make sure there is always some
fluid in the reservoir throughout the process.
•
Tighten the bleed valve and remove the tubing.
•
Top up fluid inside tank.
• Refit the rubber cap.
3 - 50
vehicle on flat ground.
this will remove any
SXV / RXV 450 - 550