#949 racing master cylinder brace driver
This volume ratio plays an important role in the clamping capability of the caliper, and leverage that the driver has to generate that clamping force. While a change in master cylinder bore size affects a pressure change, it also changes the amount of pedal travel realized to add the additional stroke needed to displace enough fluid to move the caliper pistons. We will do the calculation and show our work to reinforce the math for calculating bore area. Basically, I just repeated what Carl said in an effort to make the math more simple and I bet the barrage of numbers made the calculation more intimidating and confusing? It’s ok – we will get to a simple way to look at the master cylinder math and going through the steps will make the process easier to understand.Īnother way to explain Carl’s math uses a 7/8” master cylinder as the example. You then multiply your radius which is a half an inch (.5) by itself so. The result is that a 1” master cylinder has a radius of half an inch. So you calculate the radius of 1” bore which is simply half of the diameter which equals. To get to this number you use the formula for Area which is: Area = 3.14 (Pi) multiplied by the radius squared. This line pressure management becomes a key factor in setting brake balance.Ĭarl explains that a 1” Master Cylinder has a bore area of. A decrease in master cylinder bore area produced a proportionate increase in line pressure.
6, that same 100 pounds of force from the pedal will generate 166.7 PSI. If we apply that same 100 pounds of force to the 7/8” master cylinder, using the formula 100 divided by. 785”) for any master cylinder size, you can calculate how much pressure change would be affected by a bore size change.Ī 7/8” bore master cylinder has a bore area of. By calculating the area in inches squared (bore x bore x. For every hundred pounds of force applied to the master cylinder piston by the pedal push-rod or balance bar, that master cylinder will generate pressure equal to 100 divided by. The amount of pressure generated is a function of the force being applied, divided by the master cylinder bore area. With your own knowledge base, education will allow you to better communicate your needs resulting in the best brake system possible.Ĭarl Bush: A master cylinder is used to convert force from the brake pedal into the hydraulic pressure that operates the brake calipers. While I encourage you to consult your brake company engineer to build the right braking system, I also encourage you to learn how the parts interrelate. We contacted long time brake expert Carl Bush from Wilwood engineering to help our readers understand the brake system. Each brake component relates to the other braking variables and an individual change may necessitate the need to reanalyze your entire brake system in your effort to achieve a balanced clamping force on your car. Since pad compound, rotors, calipers and master cylinders all work together in relation to car weight, speed and track characteristics, it makes sense to think of your brake system as a package.
It is highly recommended that you work with your brake company engineer to assist you in building the right combination to tailor a system for your application. Efficient braking is based on choosing the right components and matching the proper combinations will result in a brake system that works in conjunction with the specifics of your car, track and driver style. Going faster creates a need for stopping faster.
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