i have a 1992 f250 with a 93 cummins 12 valve in it. when we did the swap i had ok brakes wernt to good but enough to get by. so just the other day i blew a rear wheel cylinder so we got new wheel cylinders for both sides new shoes and new springs. everything is adjusted right in the rear now my truck has a pedal from hell but has no brakes!!!!!! i was wondering if theirs an after market vacuum pump for this or do i need to convert everything to a hydro brake system ... someone help me