Where Is the Master Cylinder Located?

Reviewed by

Richard McCuistian, ASE Certified Master Automobile Technician

Technical Reviewer at CarParts.com

Written by CarParts.com Research Team - Updated on November 2nd, 2023

Reading Time: 2 minutes
Summary
  • Typically, the master cylinder is in your vehicle’s engine compartment.
  • The master cylinder is essentially the heart of your vehicle’s brake system.
  • Accessing the master cylinder requires safety equipment like protective eyewear and gloves.

Q: Where Is the Master Cylinder Typically Located?

A: If your car has power-assisted brakes, which is most common, the master cylinder might be linked to a brake booster connected to the brake pedal. The whole assembly is fixed to the firewall that’s found in the engine compartment.

The whole assembly that includes the master cylinder is typically fixed to the firewall that’s found in the engine compartment as you see in this photo. This is the master cylinder on a 2006 Ford Explorer. | Image Source: Richard McCuistian

The master cylinder has two types: the transparent reservoir and the metal or nontransparent plastic reservoir. The former lets drivers see the fluid level without opening the reservoir, which is not the case for the latter.

On the other hand, if your vehicle has manual brakes, you’ll likely find the master cylinder fixed to the firewall and connected to the brake pedal. Note, however, that practically no vehicle has manual (not powered) brakes any more.

Tips on How to Access the Master Cylinder

Remember to use safety equipment like eyewear and protective gloves when accessing your ride’s master cylinder. It also pays to loosen the lug nuts of the wheel before raising the vehicle for easier removal later.

To find the master cylinder, you’ll have to find the brake lines it’s connected to. You’ll need tools like a wrench and a socket to loosen the brake lines. Keep some penetrating oil handy as well in case you need more help to ease detach the brake lines. Once you can access the master cylinder, loosen its bolts to detach it.

About The Authors
Reviewed By Richard McCuistian, ASE Certified Master Automobile Technician

Technical Reviewer at CarParts.com

Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.

Written By CarParts.com Research Team

Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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Published by
CarParts.com Research Team and Richard McCuistian, ASE Certified Master Automobile Technician