hey mate, does it click when you bring the pedal back up? sometimes on the down too.
Mine did this for about a year, then a few weeks ago made a badder noise. I put the car off the road, and its still off, waiting for a wee white clip thing to come into stock for the brake pedal. I'll hopefully post up a "
how to" once i've got the part,
so far its only cost me about £30 for a new box, but it was under staff dicount. Also I know that the new box will prossibly brake too, as its more or less the same, though perhaps better material, and certainly neater spot welds with smaller fusion zones. but if it lasts another 5 years, i'll be happy.
Here's the pic of what mine looked like, you take off the plastic cover and stick your head under to see this.
HTH
JAmes