What is a Master Cylinder?

A master cylinder is a hydraulic control that changes pressure into hydraulic pressure in order to work other instruments in the hydraulic system. When it comes down to automotive use the most common use for the master cylinder are in the brakes and the clutch. The clutch?s master cylinder is called the Slave Cylinder and the Brake System is operated by brake calipers and wheel cylinders.

How does the Master Cylinder Work?

The Master Cylinder is located on the top part of the engine block. It has three parts, the Master Cylinder itself, the Fluid Level Sensor and the Reservoir. As you press the brake pedal it puts pressure on the main piston via the linkage. As pressure builds in the cylinders the brake pedal is more decompressed. Then the pressure from the main piston and the second piston will make the second piston compress fluid into the circuits. If there is a leak in one of the circuits , there will be no pressure behind the brakes.

How Do I know when the Master Cylinder is Bad?

Many drivers who know nothing about their cars systems, should know when the master cylinder is not working properly. The brake system should be a priority, you should know when there is trouble. When the master cylinder starts to go bad you will notice the brakes when they are pressed are feeling soft. Even when you have your foot on the brakes the pedal will slowly sink to the floor. When you pop the hood you will see brake fluid leaking from the cylinder. Have it checked out if you notice any of these warning signs.

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