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Front discs are 276mm and I'm running 15x8j et28 at the moment which I'm hoping to keep.
I was thinking that if I were to design a bracket to mount another stock caliper on each of the fronts it would be a far cheaper alternative to a Wilwood upgrade kit (which apparently does fit) or having to change my wheels...
What I don't know about is whether I would need to change the brake cylinder for a beefier one or if the stock one would work fine with the extra calipers?
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You’ll definitely need a different MC to deal with twice the OEM piston area on the front, I’d wager that you’ll never find a replacement MC to suit using two single piston sliding calipers on the same axle, sliding calipers tend to use one large piston and doubling that area will need a massive MC and you’d probably need a one of pedal box to be able to find an MC to suit
I’ve done twin caliper setups on the rear using a spot caliper for the handbrake and a 2 or 4 pot caliper for the brakes on a few cars.
What size discs have you got on the front? If you had the right wheel offset you could run up to 295 with 4 pots but it would be spendy (cad grab of my setup)