should be 4 bolts. You might have to pry a little or use a small hammer to get the cap off. Be careful, the servo piston is under pressure from a spring. Take note of how the piston is oriented (There will be a hole for fluid flow). Also, be prepared for some fluid to come out. I did it in the car and it was a PITA, but out of the car shouldn't take more than 10 minutes.