I have not had to use them, instead I just use a DIY bleed bottle in a way that the tubing and entire bottle with liquid is above the hub level but below the master cylinder level.

This keeps the caliper under liquid and doesnt let air back in. Just pump away slowly and air gets expelled out.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)