[mcmlxix]

The volume of the fluid in the caliper and the size of the bore in the MC could be your problem... If the D52 uses more fluid then the factory calipers, the MC bore size may have needed to be adjusted to match. Also, your distibution block may be resticting fluid transfer. Not sure what came on the truck. Last thing I can think of is rubber lines... Original or replaced? Old rubber can look ok but be bad on the inside....