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> What kind of calipers are these?
tornik550
post Jan 7 2015, 01:31 PM
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These are from a 911 however I do not know the year. I think it was somewhere in the 80's. What kind of caliper are they. If I am going to use them (I have a 911 suspension) what rotors do I buy?


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rhodyguy
post Jan 7 2015, 01:36 PM
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Just went thru this. Measure the bolt hole spacing and the thickness of the spacer in the middle of the 2 halves and report back.
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tornik550
post Jan 7 2015, 02:01 PM
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3.5" bolt hole spacing
1cm middle caliper spacer
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SLITS
post Jan 7 2015, 02:27 PM
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Spacer between halves are either 7 mm or 10 mm as I remember.

7 mm = 20 mm vented rotor

10 mm = 24 mm vented rotor

They are 911 SC calipers.
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tornik550
post Jan 7 2015, 02:32 PM
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QUOTE(SLITS @ Jan 7 2015, 03:27 PM) *

Spacer between halves are either 7 mm or 10 mm as I remember.

7 mm = 20 mm vented rotor

10 mm = 24 mm vented rotor

They are 911 SC calipers.


Sounds like I need the 24mm vented. Is there a specific name to these calipers? Do all SC calipers take the same pads?
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SLITS
post Jan 7 2015, 02:53 PM
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20 mm = 911SC calipers .. called "A" calipers

24 mm = 911 Carrera calipers ... called "Wide A" calipers
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rhodyguy
post Jan 7 2015, 03:14 PM
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yes, they are 1 cm thick.
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Eric_Shea
post Jan 7 2015, 03:25 PM
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11mm thick spacers = Carrera or "Wide A-Caliper"

48mm cup style piston
3.5" Mounting ear spacing
Uber Heavy 9lbs. 6oz. without pads etc.
Uber heavy 24mm rotating mass flywheel associated with them (better known as more brake rotor than any 914 will ever need) (IMG:style_emoticons/default/biggrin.gif)
Same FMSI D45 pad size for all A-Caliper species.
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colingreene
post Jan 7 2015, 05:35 PM
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Could you take the spacer out and run the more narrow rotors though?
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bdstone914
post Jan 7 2015, 05:52 PM
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QUOTE(colingreene @ Jan 7 2015, 05:35 PM) *

Could you take the spacer out and run the more narrow rotors though?



Yes, if you can find the thinner spacer. Some BMW's have the right spacer. I am building a pair with BMW spacers in Porsche calipers.
With no spacer they would work with a solid rotor.
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colingreene
post Jan 7 2015, 06:02 PM
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isent the solid rotor what you want for a 914, since its not got the weight or the speed to really need the vented one.
hence erics comments?
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falcor75
post Jan 8 2015, 05:18 AM
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Better brakes allows you to brake later....but for a sunday cruiser then stock brakes are ok, not great, but ok.
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brant
post Jan 8 2015, 06:57 AM
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Better pads and tires allow you to brake later. Stock brakes with the proper pads and tires are better than ok
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Eric_Shea
post Jan 8 2015, 09:36 AM
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QUOTE(colingreene @ Jan 7 2015, 04:35 PM) *

Could you take the spacer out and run the more narrow rotors though?


Yes, this is a common question probably because of the "Bird in Hand" theory.

You can take the spacers out entirely and run a solid rotor but, you'll need shorter fasteners as the stock M9 (no longer available in any head style) fasteners will bottom out. I'm sure putting a solid rotor on is not the desired goal here regardless, especially with that size pad. You can warp a solid rotor fairly easily with too much friction and, you'll end up with fade.

The fact is, it never really works out for you unless you can find that one individual that has a set of 7mm SC spacers and fasteners with no calipers to go along with them. Let's see why "bird in hand" doesn't really play out with caliper spacers:

All you need are spacers and fasteners right?:

Who has just those items? - Basically, nobody. I'm sure "someone" does but, they usually have calipers to go along with them. Bird in hand now becomes needle in haystack.

Where do they come from? - The spacers and fasteners you need have to come "out" of a pair of core calipers. Best to just buy the set of core calipers and sell the current set of cores you don't need. $0 exchange.

I could shave these down to 7mm. - You could. Not that this would matter much to anyone but, you'd ruin a set of Carrera spacers that someone who needs a Carrera caliper could use. Then you'd have machining costs (unless you have a mill) and extra long fasteners that will come close to bottoming out before they torque up to spec. M7 and M9 stuff is basically non-existent. Colin at Superformance in the UK has some but they're around $7 (x8 plus shipping from the UK).

When you get down to the meat and potatoes, you've gotta use your noddle or you could lose your bread. (IMG:style_emoticons/default/wink.gif)
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tornik550
post Jan 8 2015, 09:43 AM
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The "wide A" calipers came with a front suspension that I am using for a 5 lug conversion. Other than weight and overkill, is there any significant problem with me using these calipers on my 914?
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Eric_Shea
post Jan 8 2015, 11:55 AM
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Nope. (IMG:style_emoticons/default/wink.gif)

Rotors etc. shipping today out of Harrisburg. (IMG:style_emoticons/default/thumb3d.gif)

FYI... you now have the same basic pad size and the same pistons as those Brembos you had.
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colingreene
post Jan 8 2015, 11:55 AM
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I would say no, its just not the optimal high performance set up.
Eric might be able to tell you if you will have brake pedal issues as far as not enough master to push those slaves.
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stugray
post Jan 8 2015, 01:39 PM
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The fastest 914 at the track has 5 lug conversions and vented rotors.
However the driver says he wishes he had never converted to 5 lug as the added weight & cost of parts negates the tiny bit of benefit of better brakes.

He said the only advantage in his mind was greater wheel selection options.
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colingreene
post Jan 8 2015, 03:23 PM
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That makes sense, its a problem i run into in the mini world trying to find wheels that are 4x100
the 5 lug thing opens that door pretty wide.
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