@Philia_Bear is single piston in rear. It compressed easily with the clamp and I greased up the sliders and it was all moving nicely when I put it back together. I'll keep a closer eye on it from now on though!!
On a worse note, on the way to work this morning, Skippy decided he like the look of my car and went like a racer bullet to my driver's door.
End result is a completely smashed drivers mirror. No panel damage though which I'm impressed about as he hit pretty hard with me doing about 85kmh by the time I'd wiped off some speed.
He did leave a nice lot of fur n the rear wheel arch!