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Mustang Nut
Joined: Sun Oct 22nd, 2017
Location: Horsepasture, USA
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What you described in the first post is what happened with my 74 Stingray. The seals were leaking brake fluid into the booster. It took a new booster and me rebuilding the master cylinder to get it straitened out.
What Tsquare mentioned about the master cylinder leaking into the brake booster happened on a 68 Mustang GT I had back in the 80's where the rear seal in the master cylinder starts to leak & the brake fluid leaks into the brake booster & if left long enough could damage the booster diaphragm. The only way to find it is to pull the master cylinder & check the rear seal in the back of the master cylinder for any sign of a leak because there will be no evidence of a leak otherwise.
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21 Bronco Sport Big Bend (Wife's DD)
05 F150 XLT Reg Cab, 2WD, 5.4L, Auto (My DD)
69 Mustang Coupe 5.0, 5 spd 9" rear(Project)
14 Kawasaki Vulcan (Wife's Toy)