jeremy92555
New Member
Ok, here is what I did. I put in a 1993 hydroboost out of a Astro Van. I used the the master cylinder off the astro van as well. The master cylinder has a MF sticker on it if that matters. But, I did not use the proportioning valve. My hoses off my stock master cylinder fit right into the Astro M.C so I did not change anything there. When I bleed the system with the truck off it seems to bleed like normal. But, when I start the bronco and press the pedal the pedal pushes back and seemed to find a weak point in my break lines and also causes a leak at a fitting near by rear axle. What is causing the pedal push back? Why dont I have a normal pedal. Any help would be greatly, greatly appreciated because I am now frustrated and I am sure it has something to do with what I did or didnt do.