The master cylinder pressurizes the brake system when the pedal is pressed or applied.  It also provides hydraulic fluid to the wheels. A red brake-warning light typically lights up with hydraulic failure.

A typical brake system

When your vehicle is turned off, the brake pedal should remain firm. However, when you push the pedal lightly and it sinks to the floor, you have a leak. When driving, if the brake pedal is fully depressed and feels unresponsive or spongy, this is also the result of a malfunctioning master cylinder.

It is often necessary to replace the master cylinder and bleed the hydraulic system of air.  You will want to get your vehicle repaired with a qualified auto technician as soon as possible due to the high safety factor involved.

As always; stay safe everyone!

a typical master cylinder

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