Having never had an issue bleeding brakes in my life ... I do not carry a 2x4 around to jam the pedal.grandfatherjim wrote:I imagine a combination of compressed air and liquid in there, with the bubble of air slowly moving within the brake line i.e. there isn't really fluid returning to the MC. Having said this, I don't know why the air would "want" to return to the MC. But several people have sworn it worked, FWIW.
Maybe gravity plays a part. It does explain most things we can't otherwise understand.
Colin