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glennpm · 10-25-2020, 05:10 AM

Atmospheric pressure only, that's why whoever is helping doesn't let the pedal up until you close the bleeder and tell them to let up. If not you suck air back into the slave cylinder and/or line when they let up on the pedal.

10-25-2020, 05:10 AM	#21
glennpm Senior Member Join Date: Sep 2014 Location: Wiscasset, Maine Posts: 1,981	Re: 1940 Brake Bleeding Atmospheric pressure only, that's why whoever is helping doesn't let the pedal up until you close the bleeder and tell them to let up. If not you suck air back into the slave cylinder and/or line when they let up on the pedal.