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914-4 vs 914 -6 rear calipers

What is the difference, if any, between the 914/4 and the 914/6 rear brake calipers?
Old 01-26-2011, 03:33 PM
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PMB Performance: We Don't Rebuild Your Brakes... We Restore Them

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Old 01-26-2011, 03:42 PM
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Apparently about $1,100.00; ask me how I know
Seriously, my original six came to me w/o the original rear calipers. It has 4 cylinder calipers on the rear which are in good shape and worth about $200. I bought a completely restored, ala Eric Shea, set of 914-6 GT rear calipers for $1,300 delivered.

Oh it might just be me, but they look bigger than the 4 cylinder calipers.
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Old 01-26-2011, 04:06 PM
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Here are the beautiful rears I bought which Eric had restored.

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Old 01-26-2011, 04:12 PM
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As far as I know, the main difference is that the Six calipers have larger pistons. There are probably other differences, but that is the functional one. Both are for solid rotors of very nearly the same diameter (the six ones may be a couple of mm larger) and thickness, both have the cable-actuated parking brake mechanism that works on the inner pad only, both have funky mechanisms inside them to set the clearance, both have the same mounting points and brake line attachments, etc.

If Eric at PMB says anything to contradict what I have just said, though, listen to him. He has seen the insides of more of those calipers than I have seen the outsides of!

--DD
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Old 01-26-2011, 09:30 PM
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6 Calipers

++ on prior posts. Stock 6 pads are supposedly larger than stock 4s... 914-6 GT rears are more unique, they have a spacer to accommodate vented rotors and the pads are the same size as the front pads for an early 911 T. They also have the funky mechanism for the hand brake actuator. This Ebrake arrangement was supposedly unique to the 914 model, but I heard some years ago that ATE may have made something similar for a 308 Ferrari??? Can anyone confirm this story??
Old 01-30-2011, 09:22 PM
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The 308 calipers are nearly identical to the 914 rear calipers. I believe that they have the spacer for vented rotors, but I think that the piston is larger than the 914-6 one. Plus the bleeder winds up on the bottom of the caliper if you mount them on a 914.

Eric just recently finished rebuilding a set of 308 calipers. He has pics on his Facebook account.

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Old 01-31-2011, 08:51 AM
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Eric rebuilt 308 calipers for me, they work great. He puts another bleeder on top.
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Old 01-31-2011, 08:54 AM
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Calipers

Thanks for the confirmation on the 308 application...does that mean that, with the exception of the bleeder valve location, they would be direct bolt on replacements either for a 914 GT or stock 6 caliper (ie, without the spacer)?
Old 01-31-2011, 01:13 PM
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The answer is yes, the 308s will bolt on.

And

914/4 calipers = 33 mm piston

914/6 calipers = 38 mm piston (Same as the 308).

Housing are slightly different ... that's about it
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Old 01-31-2011, 06:15 PM
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Calipers

Thanks...it is nice to know there is another application for the rear calipers and the possibility of an extra parts source. I was fortunate about 20 years back to acquire the brake system from a factory 6 GT complete with two sets (in original packaging) of the smaller diameter rear vented rotors peculiar to the 6 GT set up. I would imagine these parts are very hard to find today, as they were rare 20 years ago!
Old 01-31-2011, 10:19 PM
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