928S4 front & 951 rear brake upgrade for 78 911?

[Erik Mckenna]

I have tried to do searches but it only mentions Bigred and other types of brake upgrades..
is there a list anyone has of all the items needed to complete a full swap onto a 78 911 ??
-TIA.
Eric

[ChrisBennet]

I did the S4(993) front brakes on my '86. It was very expensive - more than Big Reds. The 930 floating front rotors are ~$390 each.
Check out Bill V's web site if you haven't already:
http://www.pelicanparts.com/MotorCity/wmv/brakes.htm
-Chris

[North Coast Cab]

The 928S4 and 951 rear calipers are virtually the same and both have 30/28 pistons.

John

[Bill Verburg]

hard to believe that search didn't turn up a large # of threads
but
once more
you need
1 x complete set of 993 calipers front and rear.
2 x caliper adapters for the front
2 x modification to 3" axial mount at the rear & modified throat. 965 rear can also be used and are more desireable due to the wide throats that are oem.
2 x front pads set
2 x rear pad set
4 x axial mounting bolts front
4 x radial mounting bolts front
4 x axial mounting bolts rear
4 x flex lines & fittings
2 x 304x32mm front rotors and mounting hats(DIN has 309x32 that also work)
2 x 309x28 mm late 930 rear rotors
2 x remove rear dust shield & mounts

you do not want any of the 28/30 variants 964/951/944/928

[Erik Mckenna]

Thanks guys!!!!!
Bill,
I tried but I wanted to make sure the info I was getting was for the S4 set and not the BIG Red set.. Thanks for the info.

Chris.
yeah I am not going to go with floating rotors ( if I can help it ) as they DO cost a bundle...

-Eric

[Bill Verburg]

I wanted to make sure the info I was getting was for the S4 set and not the BIG Red set

functionally they are identical in that they have the same pistons and they use the same adapters. The difference is that the taller Big Red needs a taller rotor 322 vs 304mm and a taller pad.

yeah I am not going to go with floating rotors ( if I can help it ) as they DO cost a bundle...

yes, but worth it for track use

[einreb]

Originally posted by ChrisBennet
I did the S4(993) front brakes on my '86. It was very expensive - more than Big Reds.

rough cost breakdown for me...

$350 ish - set 993 calipers and pads from a WTB post on rennlist 993 forum
$415 ish - front adapters, hats and rotors from probrake
$180 ish - 930 M/C
$320 ish - 930 rear rotors
TBD - new hard brake lines

these prices are off the top of my head, but ballpark. So roughly $1300 minus whatever you can get for your old brake setup.

-Bernie

[Erik Mckenna]

Quick question guys about the extrenal lok of the 993/S4 calipers.. I have seen a set for sale VERY cheap and the one this is they are the same caliper and all but the kettering on one is raised ( like a 951 caliper ) and the other it's a painted decal... do you think they are diff or is it just that they changed the PORSCHE font the on the outside of the caliper.. i am hoping that they are the same pistion size and all..
Id there anything I can get off the caliper that would confirm that they would work with one another given the fact that they have diff PORSCHE font?
let me know if you would need a part number or anything I'll get it for you . I just don't want to buy them and find they won't work with one another.. but again they are the same looking caliper and all from what I can tell.
TIA

Eric

[ChrisBennet]

Originally posted by einreb
rough cost breakdown for me...

$350 ish - set 993 calipers and pads from a WTB post on rennlist 993 forum
$415 ish - front adapters, hats and rotors from probrake
$180 ish - 930 M/C
$320 ish - 930 rear rotors
TBD - new hard brake lines

these prices are off the top of my head, but ballpark. So roughly $1300 minus whatever you can get for your old brake setup.

-Bernie

Bernie,
Who is "probrake"? Do you have a link?
-Chris

[einreb]

Http://www.ProBraking.com

here's a thread of them being put to use...

Busy weekend coming up - Brakes and such

i dont think this is sold on pelican, but mods feel free to edit this if I'm biting the hand that feeds this board.

-Bernie

[Bill Verburg]

here's a thread of them being put to use...

And here's another

Quick question guys about the extrenal lok of the 993/S4 calipers.. I have seen a set for sale VERY cheap and the one this is they are the same caliper and all but the kettering on one is raised ( like a 951 caliper ) and the other it's a painted decal... do you think they are diff or is it just that they changed the PORSCHE font the on the outside of the caliper.. i am hoping that they are the same pistion size and all..

None of the 993 calipers had the raised letters, that was only doone on the early 944 and 928 rear calipers, they awere all 28/30 rear . Not what you want.
Besides that they are obviously not a matched set, I wouldn't touch them.

[Erik Mckenna]

ok.. ok.. I ditched the caliprs I had.. i bought a set of 993C4 silver calipers from ebay sop NOW I have the good stuff up front.
I think there is SO MUCH info on this now I have (OVERLOADED myself).. I have 993 front calipers... and 951 rear calipers.( IS THERE A PART # FROM SOME THAT I CAN CONFIRM THIS WITH). is this NOT a good idea? should I sell the 951's and get some 993 rears ? or is there a way to make this work with what I have and can I use a standard 930 rear rotor with the 951's IF i keep them.. ??
sorry but I am so lost in all the info.
I have read that I can make the 993's front work with 930 rotors.. and now I am confussed on the rear set up...

ARGH!

[Erik Mckenna]

bump for new day

[Bill Verburg]

is this NOT a good idea? should I sell the 951's and get some 993 rears ?

Yes to both

you want 993 or 965 rear calipers both have 30/34 pistons, the pad box on the 965 is 98mm x 67.5mm, the pad box on the 993 is 98mm x 63.5mm but can be widened enough w/ a grinder

the 34mm pistons can be identified by measuring the external portions of the piston head O/I diameter 26.5mm x 15mm


the 30mm pistons can be identified in the same way, diameter 26.5mm x 12.5mm


the 28s are 24x12mm