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have a 69 XR7 . it has power disk front brakes and drum rear brakes . want to convert the drum to disk . can i use the proportioning that is existing ?
 

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To convert rear drum to disc you will need an aftermarket proportioning valve and master cylinder. Stock disk/drum masters do not provided the fluid volume needed for disc. To this point, you will notice that the bowl on the cylinder is bigger for the disc and smaller for the rear drum. They have to be the same for disc/disc. Good luck.
 
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