Gary Fisher 2004 gary fisher bicycles Manual Do Utilizador
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CHAPTER THREE
Inspection, Adjustment & Lubrication
Introduction
Instead of pressing on the wheel rim to slow
the bike, this braking system presses on a disc
that is mounted on the wheel hub (Figure 3.7.11).
The brake is actuated by a brake cable operated
with a standard brake lever. The disc is attached
to the hub with bolts, and a disc brake caliper is
attached to the left side of the frame or fork. This
system consists of several parts:
• Brake lever
• Brake cable and housing
• Brake caliper and disc
• Brake cable and housing
• Brake caliper and disc
Disc brakes may be very hot after use, so use care when
inspecting them. As with other rotating parts on a bicycle,
avoid placing your fingers in the disc.
Inspection
Before every ride
squeeze the brake lever
firmly. It should not be possible to pull the lever
fully to the handlebar.
Check that there is no oil, grease, or other dirt
on the disc. The disc (Figure 3.7.11) is part of
the braking system, so keep it clean at all times.
Remove the brake pads from the caliper during
heavy cleaning. Do not use cleanser, de-greaser,
or solvents to clean the disc. To clean discs, use
isopropyl alcohol.
Once a month
inspect disc brake pads for
wear. If disc brake pads are less than 1.0 mm
thick, replace the pads. Check that the brake
pads are in proper position, allowing 0.25 to
0.75 mm clearance from the disc when the
brakes are not applied (Figure 3.7.12). Spin the wheel; when
the brake lever is not pressed, the brake pads should touch as
little as possible on the disc.
Disc
Figure 3.7.11 Disc brake
Brake
Cable Actuated Disc brakes
Figure 3.7.12 Disc brake pad
clearance
clearance
WARNING
Disc brakes and discs get very hot during use and could burn
skin. Also, the disc edges may be sharp and could cut skin. Avoid
touching the disc or disc brake when hot, or when rotating.