Master cylinders that generate hydraulic pressure.
Leaks or internal wear can cause a sinking pedal or poor braking response. Match the cylinder by bore size, port layout and reservoir design. Bench bleed the cylinder before installation. After fitting, bleed the system until the pedal is firm. A healthy master cylinder supports consistent pedal pressure.
Internal leaks in the master cylinder can cause a sinking pedal.
Yes. Bench bleeding removes air before installation.
If the reservoir is cracked or discoloured, replacement is recommended.