Before trying to loosen the bleed nipple, clean around it with a wire brush (spray with penetrant WD40/Liquid wrench if you like), then give it a couple of light taps with a hammer (from the top or the bleed nipple in the direction of the bleed nipple).
Use a six sided socket to initially loosen it. Then switch to your spanner for bleeding.
I've learned these tips the hard way after, snapping and rounding bleed nipples in the past.
Ls400 Brake Bleeding
in Lexus LS400 (1994–2000)
Posted
Before trying to loosen the bleed nipple, clean around it with a wire brush (spray with penetrant WD40/Liquid wrench if you like), then give it a couple of light taps with a hammer (from the top or the bleed nipple in the direction of the bleed nipple).
Use a six sided socket to initially loosen it. Then switch to your spanner for bleeding.
I've learned these tips the hard way after, snapping and rounding bleed nipples in the past.