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Tech Talk with Master Power Brakes

Master Cylinder Bore Size Affects Pedal Travel Distance and Effort

Posted by toby on Jul 5, 2013 3:38:26 PM

Converting manual brakes to power-assisted brakes is a daily job here at Master Power Brakes. But we also have loads of manual brake enthusiasts and car collecting hobbyists among our customers. Whatever your preference, because components like brake boosters and master cylinders come in a variety of sizes and configurations, you may really need some help sorting out available options to optimize your brake components based on your vehicle. Tada! Enter the tech pros here at Master Power Brakes.

Not long ago, we received a request for help from the owner of a 1969 Ford Mustang who was looking for a master cylinder to use for his 4 wheel disc brakes set up. Mustangs are among the most frequent cars for which we provide brakes, so we thought our recommendation on master cylinder replacement might help another owner.

In this case, with the manual disc brakes both front and rear on the customer's '69 Mustang, we recommend a 1" bore master cylinder, specifically MPB part number MC11378M. This master cylinder has a 1" bore and ports on the left hand side of the master cylinder which should work well for a 1969 Mustang. Customers have consistently used this master cylinder in many four wheel disc cars with success as measured in comfortable brake pedal travel and required pedal effort. If your situation requires it, we also have an adjustable pushrod available as an attachment.

A little general advice about selecting bore size in your master cylinder may be helpful. Decreasing MC bore size will decrease your pedal effort and increase your pedal travel. Conversely, a larger bore in your car's master cylinder will, all other components being consistent, increase your pedal effort and decrease your pedal travel. As with some other brake parts purchases, this comes down to your preference for how the brakes "feel" under foot when you are driving.

Need to know which  brake component is right for your situation and driving style? We love to hear from our customers and we are always happy to share our best advice on optimizing the safety and enjoyment of your classic ride. Give us a call or shoot us a line.

Topics: bore size, master cylinder, Master Cylinder

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