How do I know my master cylinder bore size?
Just so, what does the bore size mean on a master cylinder?
Pistons in master cylinders are specified by bore size, but there's a catch. The area of a circle (or bore) is Pi–R-Squared. The area of the piston surface increases or decreases as the square of the bore size or diameter. The area of something like a common 1-1/8-inch master cylinder is approximately 0.994-inch.
Similarly, how do you check a master cylinder?
How to Test the Brake Master Cylinder
- Open the hood of your car and locate the brake fluid reservoir.
- Have someone else sit inside your car and apply pressure to the brake pedal as you observe the brake fluid reservoir.
- Inspect the area around the master cylinder for fluid leaks.
Logic would tell you that a larger bore size in a master cylinder should produce more pressure but that is actually not true. Whereas if you have a larger bore master cylinder it is actually going to produce less pressure, its actually going to give you a harder pedal feel as an end result.