Master Cylinder

How to Diagnose a Sinking, Low or Spongy Brake Pedal

https://my.cardone.com/techdocs/PT%2010-0005.pdf

How Master Cylinders and Combination Valves Work

https://auto.howstuffworks.com/auto-parts/brakes/brake-types/master-brake1.htm
The Master Cylinder – The master cylinder provides the pressure that engages your car brakes. Learn how the master cylinder works with the combination valve to make sure you can brake safely.

Symptoms of a Bad or Failing Brake Master Cylinder

https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-brake-master-cylinder
Common signs of a faulty brake master cylinder include abnormal brake pedal behavior, contaminated brake fluid, and the Check Engine Light turning on.

How to Replace a Master Cylinder

Watch Video  Source: EricTheCarGuy

Replacing a Leaking Brake Master Cylinder

Watch Video  Source: Scotty Kilmer

How to Replace Brake Fluid By Yourself

Watch Video  Source: EricTheCarGuy

How to Check Brake Fluid

Watch Video  Source: Advance Auto Parts

Do You Need to Change Your Brake Fluid?

Watch Video  Source: Scotty Kilmer

How Does the Hydraulic Brake Work?

https://www.explainthatstuff.com/brakes.html
A simple explanation of how the brakes on a car or bicycle bring you to a stop by turning your kinetic (movement) energy into heat.

How to Stop Your Brakes From Squeaking

Watch Video  Source: ChrisFix