What needs to be fixed if the ABS master cylinder on a 1997 Acura GSR makes a buzzing noise off-and-on while the car is running?

check both resovoirs,the one closest to the firewall is the main one and then the other is right side near the coolant one,there is a little cover that pops off and a second one under that.mine was bone dry for the longest time and after realizing that it was empty,i filled it and no more buzz.