Insufficient Braking; Braking System Failure; Brakes Overheating - Derbi GP1 50 cc Workshop Manual

INSUFFICIENT BRAKING

B
RAKING SYSTEM FAILURE
CAUSES POSSIBLE
Insufficient braking force
Air bubbles in the braking hydraulic system
Fluid leakage
Worn fluid
Cables not sliding properly in sheaths
Noisy brake
B
RAKES OVERHEATING
CAUSES POSSIBLE
Defective piston sliding
Brake disc or drum deformed
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WORK
The rear brake (drum brake) is adjusted by setting the
relative registers (on the wheel), remembering that the
wheels must turn freely when the brake levers are fully
released.
The braking action should start when brake levers are
pulled at 1/3 of their travel.
Check wear of brake pads. If there are problems that
cannot be overcome simply by normal adjustment of
the control linkages, proceed to inspect the pads and
front brake disc, the shoes and the rear drum.
If surfaces are excessively worn or scored, replace the
affected parts as necessary.
Carefully bleed the hydraulic system (spring action of
the brake lever should not be felt)
Spring connections, piston gaskets or brake pump fa-
ilure. Replace
Change the front brake fluid and restore correct level
in the pump
Lubricate or replace
Check pads and/or shoes wear
WORK
Check the caliper and replace any damaged parts
Check by means of a dial gauge the disc levelness with
the wheel correctly mounted, or concentricity of the
rear drum