Press the brake pedal until the front brake pressure is 2,942 kPa (427 psi) . The rear brake pressure should be 2,648 - 3,236 kPa (384 - 469 psi) . If not as specified, replace the brake pressure differential valve.
Press the brake pedal until the front brake pressure is 5,886 kPa (853 psi) . The rear brake pressure should be 3,432 - 4,217 kPa (498 - 611 psi) . If not as specified, replace the brake pressure differential valve.