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Reply to "better brakes"

Glad it worked out. The reason I suggested a manual proportioning valve is, the OEM part is not adjustable and was designed to balance '70s OEM tires- which were (at best) 185-70-15" & 215-70 x 15" radials, or C-60 belted bias Arrivas in the rear. You may luck out with all the changes working together but its just safer to adjust braking bias for any combination of parts without the OEM valve , using a manual proportioning valve. Likely once set, you'll never need to touch it again- until your 305 rear tires become unavailable, and you're forced to find a new tire combination- which may then need rebiasing.

The oft-repeated Cliffs-Notes sentence of "changing calipers does not improve braking" is an extreme condensation of multiple 3-page discussions on rotor OD & thickness, pad compound and caliper position, plus amount of booster assistance. In any case it applies only to the perfectly adequate Girling front calipers. Replacing the toy sized rears with something larger & lighter- then balancing the brake bias- is nearly always a good idea. Wilwood's drum e-brakes built into the rear rotors is an adaptation of the stock 55-yr-old Corvette system and works well. I put it on my 4-wheel-disc-brake Corvair in the previous century. I've seen poor-boy copies built using early motorcycle drum brakes. OK as long as you know what you're doing.- as with any brake redesigns.

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