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TM 9-8000
to use two, three, or four pistons. The dual piston design
arrangement in ramps between the two plates so that,
provides a slight margin of safety over a single-piston
when one plate is turned a few degrees, the balls ride up
floating caliper. In the even of a piston seizing in the
on the ramps and move the plates away from each other.
caliper, the single-piston caliper would be rendered
This outward movement forces the plates into contact
useless, while the dual-piston design would still have one
with the inner faces of the brake housing for braking
working[ piston to restore some braking ability. The three
action. The action is partially self-energizing because the
and four-piston design provides for the use of larger
plate that turns in the direction of motion tends to rotate
brake lining. The brake force developec may now be
further as it comes in contact with the inner face of the
spread over a larger area of the brake pad.
rotating brake housing. The frictional contact between
the two tends to carry the outer plate around and
produces a self-energizing action.
34-16. Self-Energizing Disk Brakes. There are two
designs of the self-energizing disk brake system. Each
b. Wedge-Type Disk Brake. The basic wedge design
one is discussed separately in the following text.
of a self-energizing disk brake is illustrated in figure 34-
14. The self-energizing effect is accomplished by means
a. Rotating Plate Type. This type of self energizing
of a wedge-shaped disk brake pad. The friction force
disk brake assembly (fig. 34-14 consists of a pair of
between pad and rotor tends to force the pad into the
pressure plates or flat ring, faced on one side with a
wedge- shaped piston, producing a self-energizing
brake lining an( assembled In a brake housing attached
to the wheel. Six steel balls are positioned in a series


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