Support the calipers so they’re not hanging on the hoses.
Protect the paintwork in areas at risk from brake fluid with newspapers, blue roll or rags etc.
Wrap 4 x 10p coins in kitchen foil, 2 for each caliper, and have a couple of small G-clamps ready.
Edit: Good idea remove the pad spring first to ensure no chance of the piston scraping it as they come out.
Start pumping the pistons out of both calipers. I used the thickness of a couple of open-ended spanners to gradually pump them out as evenly as possible.
Keep an eye on the fluid level in the reservoir and keep it topped up.
Repeat on both calipers, reducing the spacer thickness until you close to the point of pistons release from the bore.
Once one piston pops you’ve lost you’re system pressure, so remove the banjo from that caliper – there will be spillage.
G-Clamp the two foil wrapped coins to the banjo fitting to prevent further fluid loss and to re-pressurise the system for the remaining caliper.
Resume pumping until the pistons release from the remaining caliper.
Remove banjo and clamp the fitting with foil/coins as before.
Clean up any spillage and use solvent cleaners as required.
As you can see one of the dust seals has popped out with the piston.
3. Piston removal.jpg