• A master cylinder helps vehicles brake properly.brake lights close-up image by Kathy Burns from Fotolia.com
  
  Master cylinders are comprised of few parts but serve an important purpose. The device uses friction to convert motion into pressure. Problems with the master cylinder are not always detected quickly. If brakes feel soft under constant pressure, or must be pumped to regain pressure, it may be time to replace the master cylinder.
  
  

Parts

• The master cylinder consists of three parts. A reservoir area, made of synthetic resin, holds brake fluid. A primary and secondary piston work with the cylinder to generate pressure. The pistons and cylinder are made from cast iron or aluminum alloy.
  
  

Autos

• The master cylinder provides automobile break systems with break fluid. The cylinder is mounted in the engine department. Cars typically have two break circuits which enable the vehicle to stop if a break line is damaged. When a vehicle has disc breaks, the brake pedal is depressed and fluid pressure from the master eventually causes the break pads to press against the rotor and slow down the vehicle.
  
  

Cycles

• Hydraulic clutch brakes are commonly found on mid and rear engine vehicles, like motorcycles. The master cylinder, also called the brake lever, is mounted on the handlebar. An actuator rod attaches the cylinder to the clutch. Brake fluid travels through the rod to enter the brake lines. Hydraulic clutch brakes operate with a minimal amount of pedal pressure.