TWO CHANNEL OBLIQUE ANTI-LOCK CONTROLLER

PURPOSE:To suppress increase of brake liquid pressure for rear wheels and to prevent locking of rear wheels, in a two-channel oblique anti-lock controller, by lowering liquid pressure at bending point of P valve when the rear wheels tend to be locked prior to front wheels. CONSTITUTION:P valves (PCVs) are placed between rear wheel brakes RL, RR and modulators M1, M2 for reducing brake liquid pressure to avoid wheel lock upon occurrence of wheel lock in any one wheel in brake systems. Each PCV comprises a control valve section, to be fitted in a cylinder section 2, for providing same boost rate of rear wheel brake pressure as that for of front wheel brake liquid pressure, a first bending point spring 11 for determining a bending point liquid pressure and a second bending point spring 12 to be contained in a liquid chamber 15 arranged between the spring 11 and a control valve section V. The second bending point spring 12 is switched to functioning state by opening the liquid chamber 15 to low pressure side through a change over valve 17.