Sym DD 50, Service Manual

Page: 103 / 157

11. BRAKE SYSTEM
11-6
Hydraulic Disc Brake
Close the drain valve of the hydraulic disc brake.
Replace the brake fluid.
Before the brake fluid reservoir is removed, turn
the handle so that the brake fluid reservoir
becomes horizontal, then remove the brake fluid
reservoir.
Cover the painted surfaces, plastic or rubber
components with a rag when servicing brake
system.
Caution
Spilled brake fluid on painted surfaces, plastic
or rubber components may result in their
damages.
Remove the master cylinder cap and diaphragm.
Use brake fluid to clean the dirty brake disc.
Caution
The dirty brake lining or disc will reduce the
brake performance.
Refill up same grade brake fluid into the
reservoir.
Caution
To mixed non-compatible brake fluid will
reduce brake performance. Foreign materials
will block the system causing brake
performance to be reduced or totally lost.
Connect drain hose to drain valve.
Open the drain valve on the caliper and operate
the brake lever until the old brake fluid is entirely
drained out. Close the drain valve and add
specified brake fluid into the brake master
cylinder.
Recommended brake fluid: WELLRUN DOT 3
brake fluid
Caution
To reuse the spent brake fluid will effect brake
performance.
Connect one end of transparent hose to the drain
valve, and put the other end into a container.
Open the drain valve around 1/4 turns, and at the
same time hold the brake lever until the there is
no air bubble in the drain hose and also feeling
resistance on the brake lever.
Close the drain valve when finishing the brake
system refilling fluid procedure, and operate the
brake lever to check whether air bubble is in
brake system or not. If brake is still soft, please
bleed the system as described below.
Cap plate
Diaphragm
Upper level
Drain valve
Drain hose
Air bubble
Cap
Lower level
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