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All '87-'93 5.0 Mustangs use a master cylinder that has three lines rather than the usual two. The third line comes out of the bottom of the cylinder and goes to the left-front brake, bypassing the combination valve, which has a plug where the left-front brake line would normally connect. The new master cylinder resembles the original but has a larger-diameter bore and two outlets. The left-front brake line will have to be cut, rebent, and reflared with a different fitting (included) to connect to the new junction.