PURPOSE: To use an ABS liquid pressure control valve also as a TCS liquid pressure control valve and simplify structure by providing a selective selector for selectively supplying the liquid pressure from a liquid pressure supplying source either one of a liquid pressure type booster and a wheel cylinder on the upper stream side over a control valve.
CONSTITUTION: A selective selector 54 having a switching position I possible to communicate a master cylinder 21 to a rear wheel cylinder 37 and a switching position II possible to communicate an accumulator 29 to the rear wheel cylinder 37 is disposed between the master cylinder 21 and a liquid pressure supplying source 25 and rear wheel cylinders 37 (37L, 37R). When the selective switching valve 54 is changed to the position I, liquid pressure control valves 38, etc. (38-43, 47, 48) for controlling the brake liquid pressure are used as ABS control valves for preventing the lock of wheels. When the selective switching valve 54 is switched to the position II, the liquid pressure control valves 38, etc. are used as TCS control valves for preventing the idle running of driving wheels.
KUBOTA HITOSHI
AKIYAMA TAKEO
