Volvo brake calipers, How to get caliper to sit in further Options

[Steve1956]

Ok,so Ive read a thread on the pros and cons of this. I have the 240 calipers installed and lines hooked up. they rubbed on my Pedrini style wheels so I bought 6mm wheel spacers and that fixed the problem. But recently bought a set Of Fuchs with Vredestein
tires that I want to run. The Fuchs rub the caliper,doubled up the wheel spacer and they still rubbed. Ground some clearance on the caliper frame to no avail. I saw a guy on one of these forums that was making brackets to move the caliper inward. This would solve both problems. Any thoughts?

[Ninja]

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Nother problem will be fluid volume.

You will change brake bias BADLY to the rear if the caliper volumes are different.

Even on the 914-6 (bigger volume front caliper) Porsche changed the master cylinder size, rear caliper piston volume, and what they use as a proportioning valve.

That prop valve is special. It's not "normal" like most.

It was made special to keep the rear brakes from EVER locking as too much rear brake bias can exacerbate handling issues that most mid/rear engine cars face (trailing throttle oversteer).

Just changing the front calipers to much larger ones will likely degrade your overall braking performance, maybe dangerously.

I'm going Boxster all way round AND changing master to 20mm+ to closely mimic the original Boxster configuration.

I have not seen "Volvo calipers mod" before, don't know what size the Volvo pistons are but all of the 4 piston calipers I've researched require careful balancing of all of the brake hydraulic system.

Real 914-6 rear calipers are $$$$ but PMB makes modern clones that are significantly more affordable.
The 914-6 rear caliper will pair OK with Boxster fronts and allow stock E-brake stuff.
The rear Boxster calipers require early 911 e-brake stuff/ fabrication on trailing arms, and some special bits.
I'm still leaning towards the Boxster stuff...