I have purchased a '91 Integra GS that makes a terrible noise when rolling. The noise cycles and sounds like a solenoid buzzing and is louder than the engine and can even be heard in the car at highway speeds! I do not get an ABS light and the brakes work fine. I placed the car on jack stands and put it in "drive" to hear the sound and traced the noise to the ABS system behind the front bumper and below and in front of the battery. How easy is it to replace this "pump" and where can I find one?

 

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...