BRAKES
9.5
DUAL HYDRAULIC CALIPER BLEEDING
This caliper is a dual opposed piston design, with two independent hydraulic systemscontainedinthe samecali-
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). Thebasicprocedureforbleedingthebrakesystemisthesameasoutlinedonpage9.7- 9.8;howev-
er, each system must be bled separately.
Hydraulic Auxiliary Brake inspection and adjustment is outlined on page 9.6.
Uppermost(inner)bleedscrewandbrak elineisforhand brake
system.
Lower (outer) bleed screw and brake line is for auxiliary (foot)
brake system.
Ill. 1
NOTE: Caliper style and location of brake lines and bleeder screws may differ
Hand
Brake Line
Foot
Brake Line
Hand Brake Bleed
Fitting
Foot Brake
Bleed Screw
DH CALIPER TOP VIEW
Piston
Seals
Sealing “O” Rings
Ill. 2
Brake Pedal (Foot)
Brake Lever (Handlebar)
Line in
from foot
brake
master cy-
linder
Line in from
hand brake
master cy-
linder
Bleeder (Foot Brake)
is outermost (lower)
on caliper
Bleeder (Hand Brake) positioned
innermost (higher) on caliper
Cutaway View Of DH Caliper
Pad
Spacer
Upper Bleed
Screw
Hand Brake
Lower Bleed
Screw
Auxiliary Brake
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