Shimano Brake Lever Diaphragm Replacement

Just in case you forgot to attached the bleed cup before pushing back caliper pistons (especially where you have over bleed in the past...)

then for SLX and above here is the guide to replacing the diaphragm.

https://si.shimano.com/en/dm/MADBR01/replace_diaphram

only issue with the official method is that by levering out the plug and diaphragm from within the bleed funnel hole is that is def damages the diaphragm meaning you can't inspect to see if you had a rupture in the first place

Also the new kit comes with a new grub screw, but you don't need to fully remove the old - so is just a spare