A brake system having a brake stack with a stack closure pressure , a force member positioned within a cylinder , a valve configured to adjust fluid pressure in the brake system , and one or more pressure transducers that generate a proportional electrical signal representative of the fluid pressure within the cylinder , the brake system comprising: one or more processors in electronic communication with the valve and the one or more pressure transducers ; and a memory coupled to the one or more processors , the memory storing data comprising a database and program code that, when executed by the one or more processors , causes the brake system to: generate a valve command instructing the valve to increase the fluid pressure in the brake system , which results in increasing an amount of brake fluid supplied to the cylinder at a fixed rate; monitor an output of the proportional electrical signal generated by the one or more pressure transducers ; determine a derivative value of the output of the proportional electrical signal as the amount of brake fluid supplied to the cylinder is increased at the fixed rate; determine a transition point (C) of the derivative value, wherein the transition point (C) represents when the derivative value exceeds about zero and increases to a positive value; and select the fluid pressure at the transition point (C) as the stack closure pressure of the brake system . one or more processors in electronic communication with the valve and the one or more pressure transducers ; and a memory coupled to the one or more processors , the memory storing data comprising a database and program code that, when executed by the one or more processors , causes the brake system to: generate a valve command instructing the valve to increase the fluid pressure in the brake system , which results in increasing an amount of brake fluid supplied to the cylinder at a fixed rate; monitor an output of the proportional electrical signal generated by the one or more pressure transducers ; determine a derivative value of the output of the proportional electrical signal as the amount of brake fluid supplied to the cylinder is increased at the fixed rate; determine a transition point (C) of the derivative value, wherein the transition point (C) represents when the derivative value exceeds about zero and increases to a positive value; and select the fluid pressure at the transition point (C) as the stack closure pressure of the brake system . generate a valve command instructing the valve to increase the fluid pressure in the brake system , which results in increasing an amount of brake fluid supplied to the cylinder at a fixed rate; monitor an output of the proportional electrical signal generated by the one or more pressure transducers ; determine a derivative value of the output of the proportional electrical signal as the amount of brake fluid supplied to the cylinder is increased at the fixed rate; determine a transition point (C) of the derivative value, wherein the transition point (C) represents when the derivative value exceeds about zero and increases to a positive value; and select the fluid pressure at the transition point (C) as the stack closure pressure of the brake system . <EOS>