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Brake Master Cylinder

A brake master cylinder is a hydraulic device that pushes fluid through the brake lines to the brakesIt's a key part of a vehicle's braking system, converting the force of the brake pedal into hydraulic pressure that activates the brake calipers.

A brake master cylinder has the following components: 
Lever or pedal, Piston, Spring return, Pushrod, Bore, Piston assembly, Reservoir, Brake fluid.

Here are some signs that your brake master cylinder might need to be replaced: 
  • Your brake pedal feels spongy or goes to the floor
  • Brake fluid is leaking or looks dirty
  • Your check engine or brake warning light comes on
  • Your car “weaves” when braking
While it's possible to drive without a master cylinder, you won't be able to stop. Driving with a faulty brake master cylinder can lead to reduced braking efficiency and complete brake failure. 
Replacing a brake master cylinder can cost between $300 and $800, with most of the cost being labor. 

You can also take a look at this video:


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