English Units Service Brake Torque (lbf-in) = K x P Disc Friction Radius (in) Disc Friction Radius (in) = Disc Diameter (in) ÷ 2 - 1.25 (in) Standard Model K (Dynamic) = 3.53 P = Input Pressure (psi) Auto-Adjust Model K (Dynamic) = 2.94 P = Input Pressure - 70 (psi) Park Brake Torque (lbf-in) = Tangential Force (lbf) x Disc Friction Radius (in) Disc Friction Radius (in) = Disc Diameter (in) ÷ 2 - 1.12 (in) Tangential Force (lbf) = *Adjustable - See Table | # of Turns of Spring Retaining Cap | Total Spring Stack Deflection (in) | Tangential Force (lbf) | Release Pressure (psi) | | 0 | 0 | 0 | 0 | | 1 | .062 | 660 | 220 | | 2 | .124 | 1250 | 400 | | 3 | .186 | 1800 | 600 | | 4 | .248 | 2300 | 800 | | 5 | .0310 | 2800 | 950 | | 6 | .372 | 3400 | 1100 |
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