Dual Hydraulic Caliper Bleeding - Polaris TRAIL BOSS 325 2001 Manual

DUAL HYDRAULIC CALIPER BLEEDING

This caliper is a dual opposed piston design, with two independent hydraulic systems contained in the same cali-
per body (see Ill.1). The caliper pistons are T-shaped, which allows both hand and foot brake to use the same
caliper piston, but remain separated by seals. The hand brake system applies hydraulic pressure to both front
calipers and only the outer diameter of the rear caliper pistons. The auxiliary (foot) brake applies pressure to the
inner portion of the rear caliper pistons. Because the hand and foot brake hydraulic systems are separate, there
are also two bleed screws -- one for the outer fluid chamber (hand brake), and one for the inner fluid chamber
(foot brake). The basic procedure for bleeding the brake system is the same as outlined on page 9.6 - 9.7; howev-
er, each system must be bled separately.
Hydraulic Auxiliary Brake inspection and adjustment is outlined on page 2.28.
Uppermost (inner) bleed screw and brake line (A) is for hand
brake system.
Lower (outer) bleed screw and brake line (B) is for auxiliary
(foot) brake system.
DH CALIPER TOP VIEW
Foot Brake
Bleed Screw
Hand
Brake Line
Foot
Brake Line
Hand Brake Bleed
Fitting
Sealing "O" Rings
Piston
Seals
Inner Bleed Screw
Hand Brake
BRAKES
A
B
Outer Bleed Screw
Auxiliary Brake
9.5