This just happened to me on my 5th gen accord...it may be this thing called the accumulator...Its the thing filled with gas to keep the brake fluid under extreme pressure, and if this is leaking, which mine was the ABS pump clicks on and off trying to keep this at the pressure it needs to be. So the clicking on and off could be that, or the abs pump...check your abs resivor and around the accumulator for fluid leaks...