968 calipers on a 78' 911sc

[wkondas]

can anyone tell me if they fit? I have an opportunity to purchase the calipers and rotors, but I'm not sure if they are adaptable. any help would much appreciated.

[KTL]

Does the 968 have std. brakes or the M030 option? The M030 are big front brakes that are easier to adapt with axial-to-radial adapters. The std. 968 brake calipers are harder to adapter.

Fronts- typically the mounting ears are cut off and the caliper is tapped for bolt-on adapters that have the proper bolt hole spacing.

Rears- you can plug and re-drill the mounting holes to fit the rear of the 911.

The 968 rotors will not fit.

You need custom rotors for the front to fit properly. VCI makes a nice adaptation which is probably the best use of these calipers from an economy standpoint. 911 Brake Upgrades using 964/944T calipers
The rear rotors need to be at least 84-89 911 Carrera rotors to fit in the caliper and even then there's still a bit of pad alignment.

That said, big 930-style rotors can fit in these calipers. Just takes a bit more massaging inside the caliper to make the rotors fit.

[spuggy]

I seem to recall from looking into that a few years ago that there's two ways you can do that, the right way and the other way.

The right way costs as much (master cylinder, machining/adapters) as fitting any other brakes to the 911; but the 4-pot brembo 951/968 brakes aren't that much of an upgrade in terms of thermal capacity when you're done. But they are lighter than the "full-boat" upgrades that you may not need, so if the calipers are cheap enough it may be worth it.

You can't use the 968 rotors; you use pre-ABS (86-only) 951 rotors up front with spacers and maybe judicious grinding on the A arm, rears use 3.2 or 914 rotors in the rear and deal with the pad overhang.

The VCI web page has some great info 911 Brake Upgrades using 964/944T calipers

So why/what are you upgrading? Bling? Feel? Thermal capacity?

[wkondas]

First of all thank you so much for the feedback. I have the opportunity to buy the complete set of 968 or 993 tt caliper rotor package off a shop on craigslist.

The pricing for the 968 is $900 complete with rotors for all 4 corners and calipers and the tt's are $1500 for the same offer.

I just finished doing a 95' 3.6 conversion and would love the upgrade from a purely performance interest, but cost has now become a factor. With the tt's i understand that the rear calipers wont work from a brake balance perspective and unless i have an MC where I can adjust the bias I will need to source two rear calipers off a 930 or some other solution. In addition, buying adapters for the calipers int he fronts plus rotor hats and new MC. so about another $1k - 1500 in additional parts.

I was wondering if the 968 offered simpler solution, but it seems that isn't the case.

I'm not sure if they are std or m030's but i will post a pic and perhaps that will clarify.

Again thank you both so much and I'm wondering, from a cost point, what would you suggest as the best performance increase solution for the money?

[wkondas]

[Bill Verburg]

Originally Posted by wkondas

Those are regular small axial mount Brembos

The rotors can't be used

the fronts need to be machined and converted to radial mount and then mounted w/ a caliper adapter. 304x232mm 930 size 2 piece(hat/rotor) rotors are needed as well

like these





In back the original mounting holes are filled and then re-drilled for the 3" 911 trailing arm, the throat must also be opened out a bit, 309x28mm 930 rotors are used

like these




a 23.8mm m/c is mandatory

all in all you will be better off w/ 930 brakes or GTP-L kit

[Bill Verburg]

Originally Posted by wkondas

First of all thank you so much for the feedback. I have the opportunity to buy the complete set of 968 or 993 tt caliper rotor package off a shop on craigslist.

The pricing for the 968 is $900 complete with rotors for all 4 corners and calipers and the tt's are $1500 for the same offer.

I just finished doing a 95' 3.6 conversion and would love the upgrade from a purely performance interest, but cost has now become a factor. With the tt's i understand that the rear calipers wont work from a brake balance perspective and unless i have an MC where I can adjust the bias I will need to source two rear calipers off a 930 or some other solution. In addition, buying adapters for the calipers int he fronts plus rotor hats and new MC. so about another $1k - 1500 in additional parts.

I was wondering if the 968 offered simpler solution, but it seems that isn't the case.

I'm not sure if they are std or m030's but i will post a pic and perhaps that will clarify.

Again thank you both so much and I'm wondering, from a cost point, what would you suggest as the best performance increase solution for the money?

993RS are the same size as the 993tt except that the 993tt rear calipers use dinky 28/28mm pistons, which does throw bias way to the front . 993RS is what I have on mine but it's way overkill for a street application

front 322x32mm rotors/hat,

caliper adapter



the rear calipers are modified in a fashion similar to the 944/964/968 front, the axial ears are machined off and the caliper is converted to radial mount
left stock 993RS front right modified 993RS rear w/ adapter


L to R, stock RS rear, modified RS rear, RS/tt front


17" wheels and 23.8mm m/c are mandatory

[KTL]

Bill's way is the best way to use those 968 calipers. I like the smaller Brembos in lieu of the 930 calipers simply from a cost standpoint and a cost to re-seal standpoint. 930 calipers demand a lot of money just to buy and the cost to re-seal them is quite a bit more than the more modern Brembos.

That said, the 930s are indeed easier to adapt to the older cars. They have good bias and they'll ALWAYS demand a good price should you decide to sell them. I had people contacting me like crazy to sell my adapted 930 rear calipers when I offered them for sale.

My opinion for a SC or Carrera car needing/wanting a slight upgrade in brakes should consider doing just a small Brembo front setup and a Carrera 3.2 rear setup. The small Brembos with the 944T or 930-like rotor give some added thermal mass in front where it's needed most The Carrera 3.2 rears give you a little more thermal capacity with the wider 24mm rotor and the Carrera 3.2 calipers give you piston sizes to establish some good hydraulic bias with the small Brembo front calipers. No change needed for the master cylinder either.

We've run this setup on a few cars for a number of years and it works nicely. It's not real high on the bling upgrade list. But it does work very well in terms of heat management and bias. With good ducted cooling plumbed to the front rotors, this setup is excellent in terms of pad & rotor wear. Rear pad wear went down considerably on our cars. Bleeding brakes every event not required. The biggest gain IMO was getting good cooling to the fronts.

If this is just for a street car that never sees the track, even the original SC brakes will do just fine.