Sym PA12B Service Manual page 147

10. Brake System
Remove the reservoir cap and diaphragm.
Fill the clean brake fluid.
Caution
Contaminated brake disk or pad
decreases braking performance.
Foreign material will clog brake system
and lead to decline or malfunction of
braking capability.
Brake Fluid Replacement / Air Bleed
Connect a drain hose to air-bleed valve.
Open the air-bleed valve. Pump the brake
lever until the old brake fluid is entirely drained
out. Close the air-bleed valve and add
specified brake fluid into the brake fluid
reservoir.
Caution
Reuse of old brake fluid will affect brake
efficiency.
Connect a drain hose to the air-bleed valve,
and put the other end into a container.
Open the air-bleed valve around 1/4 turns,
and at the same time pump the brake lever
until there is no air bubble in the drain hose
and also feeling resistance on the brake lever.
Close the air-bleed valve when the brake
system fluid filling procedure is finished.
Pump 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:
1. Tightly hold the brake lever and open the
drain valve around 1/4 turns, and then close
the valve.
Caution
Do not release the brake lever before the
air-bleed valve is closed.
1. Release the brake lever slowly.
2. Repeat steps 1 and 2 until there is no air
bubble at the end of the hose.
3. Confirm the brake fluid level. Add fluid if
necessary.
4. Cover the reservoir cap.
10-6
To this chapter contents
Fluid level upper limit
Air-bleed valve
Drain hose
Reservoir cap
Diaphragm
Air-bleed valve
Brake fluid
Air bubble