Brake fluid does not compress, so only a tiny amount has to drip out for the pressure in the pipes to equalise with the atmosphere, then, as long as air cannot enter the pipes (either using the clingfilm trick or the pedal pushed down so the seal closes it off in the master) the fluid will not leave.
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Jeep ZJ, 960, Past:- Mazda2, Jumbuck, V70 (2002), 945 (1995), Hyundai Coupe, Golf Mk4, Previa, Carina, 2 x Corsa, 4 x Astra, 944 16v (1991), Espace, Escort, Audi 80, Renault 21 Savanna, Polo, Mini Clubman/Pickup, Standard 8, Capri, Maxi.
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