What Is A Master Cylinder?

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What Is A Master Cylinder?

A master cylinder is a central component of your braking system. The entire braking process relies on your master cylinder, and without it, your brakes wouldnt be able to function.

In this article, well demystify the brake master cylinder for you.

What Is The Master Cylinder?

The brake master cylinder is a component in your cars braking system that drives the pressure generated by the brake pedal to the braking mechanism at your vehicles wheels. Its essentially the heart of your cars brake system.

When you press down on the brake pedal, that force pushes a piston through the brake cylinder, converting the force into hydraulic pressure.

This pressure pumps hydraulic fluid through the brake lines, transmitting pressure to a secondary cylinder at each wheels braking mechanism.

The secondary cylinders drive the caliper piston to engage the brake calipers in disc brakes (the wheel cylinder in drum brakes). This action then goes on to stop the wheel.

The clutch system in manual cars also employs master cylinders, but theyre not the same kind as brake master cylinders.

Where Is The Master Cylinder Found?

For manual brakes, the master cylinder is attached directly to the firewall and linked to the brake pedal.

In power-assisted brakes, the master cylinder is attached to a brake booster, which supplies more power to the braking system. The assembly is attached to the firewall in the engine compartment, with the brake pedal linked to the booster.

Now that you know how the master cylinder functions in the brake system, lets see what happens inside the master cylinder:

How Do Master Cylinders Work?

Most master cylinders have a tandem design (sometimes called a dual master cylinder).

In the tandem master cylinder, two master cylinders are combined inside a single housing, sharing a common cylinder bore. This allows the cylinder assembly to control two separate hydraulic circuits.

Each of these circuits controls the brakes for a pair of wheels.

The circuit configuration can be:

Front/rear (two front and two rear)

Diagonal (left-front/right-rear and right-front/left-rear)

This way, if one brake circuit fails, the other circuit (that controls the other pair) can stop the vehicle.

Theres also a proportioning valve in most vehicles, connecting the master cylinder to the rest of the brake system. It controls the pressure distribution between the front and rear brake for balanced, reliable braking performance.

The master cylinder reservoir is located on top of the master cylinder. It must be adequately filled with brake fluid to prevent air from entering the brake system.

Simply put, the mechanical pressure exerted on the brake pedal by your foot gets converted into hydraulic pressure by the master cylinder. That pressure sends the fluid through your brake lines and engages the pistons at each of the four wheels, thus activating the brake calipers and slowing or stopping your vehicle.

Symptoms of a Bad or Failing Brake Master Cylinder

The brake master cylinder is one of the most important components found in modern car braking systems. It serves as the main valve that pushes brake fluid through the brake lines so the brake calipers can squeeze the pads against the rotors. It functions by pushing a metal rod through a cylinder to force fluid through the braking system to the wheels. One end of this rod is attached to the pedal and is actuated when the pedal is depressed. Usually, a faulty brake master cylinder will produce one of these 4 symptoms that alert the driver of required servicing.


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