Thread: 53 Is back from the Body Shop

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I got a brake question for you guys. I cannot get Rita's back brakes to grab as much as they should, It's really noticeable when pulling a trailer that it is almost entirely reliant on the front brakes. The master cylinder is an 1/16 bore off of a 1990 F-150 , The rears are disc brakes off of a 2000 Explorer, The fronts are GM metrics that came with the m2 kit, not really sure exactly what the vehicle they're off of. I have a willwood adjustable proportioning valve, and with max pressure to the rear brakes, I still can't get them to slide on a gravel road, and smashed hard to the floor, you can power brake like there's almost no brakes there. I've double and triple checked the line routing to the proportioning valve, and swapped the front and rear lines around on the valve, absolutely nothing I do makes a noticeable difference. The only thing I'm starting to think is that I maybe need a smaller bore master cylinder to increase caliper pressure, a 2000 Explorer with four wheel disc brakes does use a 1 in master cylinder vs my 1/16. Any suggestions?