The other end hooks to the bell crank linkage. It keeps the "slop out of it"...I have checked the manual again did not find it but I know where the one end of the spring goes it attaches to the brace has 2 slots in it do not tell me the other end just goes on the booster actuator shaft that comes through the firewall if so it does not make sense but after looking at it again i guess anything is possible I was looking for some kind of attachment point like a hole or hook