Thread: Drum to disc brakes.

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Dics brakes aside,we found that by using a Buick roadmaster,Chevy Caprice taxi/cop car mid 90's backing plate,we could convert to 11" drum brakes in the Astro Van's 7.5 rear end.That is a major improvement in stopping power.Drum brakes don't drag like dics do and for my two cents are the brakes of choice in a drag car.

The other info I can offer is in a Astro site a member there at is a certified mechanic tried everything to O.E.M. swap dics brakes.After yrs of never getting it right,he determined it was a volume issue and converted to the above swap.The other thing you don't have to deal with is the e-brake on dics rear brakes "can be" a pain in the butt.Corrode over time,stick on,etc.

In terms of using Ford 9" and their dics brakes,you have to consider those systems are set up for a different wt than you truck.The bias is all different front to back.So now you are trying to adjust it with aftermarket proportioning valve which are really for race car use and not street use.Part braking being not the same as emergency stopping and soon becomes more trouble than it is worth.I give the US car manufacture auto engineers three thrums up for finding a good balance point.

So as far as a Ford 9 ",you could use the 11" brakes from that.