Brake Bleeding.

CAUTION

• The information below contains errors and omissions and should be taken as a rough guide only.
• DOT 4 brake fluid is hydroscorpic which means it absorbs water, thus you should only use brake fluid from a sealed container
  
• Brake fluid can damage paint, plastic and rubber.
  
• Hydraulic brakes should only be serviced by a trained and expierienced person.
  
• If the brakes are "spongey", leaking or have any defects whatsoever then the motorcycle is not safe to drive.
• If brake fluid or and other substance contaminates the brake disc then it will need to be cleaned with "brake parts degreaser".
  
• If brake pads become contaminated with brake fluid or any other substance then they should be discarded.
  
• Once a seal has been broken new seals should be fitted.
  
• Do not mix different types of brake fluid.
  
• After servicing the brakes: inspect and test the brakes before taking the bike on the road.
  

Propper brake bleeders are commercially available.

If you are too tight to buy a propper brake bleeder then the diagram below is for a "DIY" vaccum brake bleeder.
All the connections need to be sealed to maintain the vaccum.
Continuously top up the master cylinder resivoir with fresh brake fluid as you bleed the brakes.
Many devices can be used as a vaccum pump e.g.: the air intake of a compressor or a vaccum cleaner.
If brake fluid gets into the vaccum pump it may cause it to over heat, catch fire, explode and/or give off toxic fumes.
If a vaccum pump is over loaded then it may over heat, catch fire, explode or give off toxic fumes.
The safety warnings here are not comprehensive so common sence should also be used.