twice ive had the piston shoot out while i was trying to install the parking brake lever, and the last one resulted in a torn seal (i had to go to napa 3 times today), and ultimatly resulted in my getting a third caliper (first one leaked, second one seal tore) which required me to drive 80 miles in my mom's ford windstar. i wanna make sure i dont screw anything up againt. can i installed the caliper onto the car before i put the arm on, or wont it clear it? its on an 86 z28 drivers side rear