I’ve replaced everything on my 67 Fairlane’s brakes, Wilwood four piston front calipers, drums, shoes etc. new proportioning block, lines,m/cbooster. Driving car Sunday the proportioning block sprung a leak. Brake fluid coming out of top of brake warning light switch on proportioning block. Shouldn’t have fluid there as I understand it. Proportioning block bad? Where was the rear proportioning valve supposed to be located on a 67 with power front disc rear drum brakes? Bought this car in June of 21 and the brakes have been a headache! I’m’ familiar with 67 Mustangs but the Fairlane has some differences.