It's a vent, which must be there if the brakes are going to work correctly. If fluid is squirting out of that hole, the reservoir is either overfilled or there's a failure of one of the MC piston seals.
Jerry
I just reread your reply and now see that the first time I filled the reservoir I may of filled it to full and therfore made the fluid squirt out the side of the plug.. and so by the fluid level going down some ,,I might not of had to put the toothpick in the hole to stop the fluid from coming out .. so now I am thinking that I should take the plug out and get that tooth pick out of the hole and replace the plug and it will work fine ,, am I getting this straight like what you are telling me?
