Don't even think about changing your brake pads without a pad spreader. After you have removed the old pads, the caliper pistons will inevitably stick out and you won't be able to fit in the new pads without forcing the caliper pistons back in. That's what a pad spreader is for.
Now, there are pad spreaders and pad spreaders. This is the racing type. If you watch endurance racing, you have probably seen pit crews use this tool to change brake pads. These guys don't have time to mess around and this is what they use. This pad spreader will easily handle single and multiple piston brakes. This truly awsome tool is well worth the investment!
Hazet® Impact Pad Puller for Porsche 911
This is the infamous Hazet® 1966-2 Impact Pad Puller with 4mm prongs that the Porsche Workshop Manuals recommend but that no auto parts store has ever heard of. If the Porsche workshop manual recommends the use of the tool there is an excellent reason. From all our research, the Hazet 1966-2 is the only tool, we know of, that has the required 4mm diameter prongs which fit the holes in brake pads for Porsches. The tool doesn't require an air compressor. It functions as a slide hammer.