The stock spring on the brake linkage has to be cut when you slide the furthest forward collet toward the rear of the buggy to take up all the slack in the adjustable rod ends (if left perpendicular to the center diff housing, there is about 1/4" or more slack before engagement). Left stock, it puts a lot of pressure on the servo while it's in the neutral position so it's always fighting to stay centered.

Did I do any better Guess a picture is worth a thousand words in this scenario.