Just a heads up. I find it easier to push the pistons in if you release the bleed nipples on the caliper. Make sure that you either bleed them afterwards or have a hose on the nipple so it sucks in brake fluid instead of air. Also if you don't do the bleed nipple method and just push the caliper pistons in to loosen the master cylinder fill cap. I find it helps a little and makes it easier to push the piston in. Note that if you have added brake fluid in the past ie noticed that the level in the master fluid is low and added more you may find that brake fluid has spilled over the master cylinder brake fluid container when you push the brake pistons in ( keep an eye on the level when you push the pistons in ). Brake fluid is no good for your paint work. So have a wet rag ready and wipe up any brake fluid that gets on your caliper or paint work. Don't get any water near the brake fluid container because water will ruin brake fluid and will need to bleed from the system.