According to the fifth embodiment, however, the replaced amount of the brake fluid in the cylinders 1 and 1 depends on {HEAD ~ the amount} of the brake fluid which flows into the inlet 33a of the pump 33 and flows out from the outlet 33b thereof, i.e., {TAIL ~ the operating time} of the pump 33, so that the brake fluid in the cylinders 1 and 1 is effectively prevented from being overheated by adjusting the operating time of the pump 33 
According to the fifth embodiment , however , the replaced amount of the brake fluid in the cylinders 1 and 1 depends on { HEAD ~ the amount } of the brake fluid which flows into the inlet 33a of the pump 33 and flows out from the outlet 33b thereof , i.e. , { TAIL ~ the operating time } of the pump 33 , so that the brake fluid in the cylinders 1 and 1 is effectively prevented from being overheated by adjusting the operating time of the pump 33
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