Brake master cylinder

A master cylinder consists of a fluid reservoir, a piston and a seal kit. The front master cylinder is usually on the right handlebar and the rear one near the right foot pedal. In Turkish it is also called "fren pompası" (brake pump).

Symptoms of a problem

• A spongy lever that comes back to the bar – air in the system or an internal seal leak
• The lever slowly creeping towards the bar under pressure – worn piston seal
• Leaks from the reservoir cap

It can be rebuilt with a repair kit; always bleed the brakes afterwards.