Rear caliper options to match front Turbo?

Shaun @ Tru6 · 01-01-2010, 05:59 PM

I may have the option of putting Turbo calipers in the front of my 73 and would need rears to match.

Rear turbo calipers is the obvious answer. Are there any other safe alternatives? What are some good options? Have later Al trailing arms if that makes a difference.

Steve@Rennsport · 01-01-2010, 06:04 PM

JMHO, but you really need the matching 930 rear calipers to make it work properly.

Be patient, save your money, and keep looking for a pair of rears.

James Brown · James Brown's Garage

Here you go, and cheap, only $39.95

"Caliper Covers hide those ugly calipers and provide better styling than using caliper paint."

Mahler9th · 01-01-2010, 07:17 PM

I am curious about the specifics of the car and its usage. I have a 1975 911 with a 3.8 liter engine and 930 brake calipers in the front. I am pretty sure they are 930 rear calipers. In the rear I run a simple Carrera caliper. The rotors I use are inexpensive lightweight Wilwood products.

The car weighs about 1950 pounds and is a race car that I occasionally drive on the street.

The braking system on my car works very well and I have never had an issue. So in my case, 930 calipers in the rear would not add anything but cost.

I have friends with similar cars and they have similar systems, in some cases with Boxster calipers in the rear. They have been issue-free as well.

So in my case, 930 calipers in the rear would not add anything but cost.

I think what may be best for your situation depends on several variables.

Bill Verburg · Bill Verburg's Garage

I agree w/ Steve,
best will be '78-89 930 all around

but

930 front w/ 3.2 Carrera rear also works fine

930 front w/ Boxster rear on 3.2 Carrera rotors gives a little more front but is also ok.

For track cars it's always desirable to get the rears to shoulder a little more of the load.

Kroggers · Kroggers's Garage

Shaun, save the cash and go C12 on front and rear

Shaun @ Tru6 · 01-02-2010, 06:38 AM

First, thanks to Steve and Bill for weighing in, appreciate the authority.

Mike, I plan on putting a 3.2 into the 73 soon and slowly making it more of a DE car. It has a mild suspension refresh now and has the later S alloy calipers that really don't stop all that well.

hi Pål, I have an opportunity to acquire a complete 930 front strut set-up with calipers for next to nothing, so it makes sense to go in that direction. not a done deal, just planning now.

I believe the 930 calipers will just fit under deep 6s, is that correct?

I've always believed brakes are the most important part of the car so want to put the best I can weighing driving/use parameters against cost against opportunity.

Tom F2 · 01-02-2010, 07:52 AM

Shawn, you might just go with the SC or Carrera setup. One of the local driving instructors has been using the factory cast iron calipers for years in his 69. I can ask what he's learned about pad materials. Also, he used the S calipers for a long time, until one of them started to leak.

KTL · 01-02-2010, 08:00 AM

If cost is an issue, then the 3.2 Carrera rears is the simple solution. Calipers, pads and rotors are all relatively inexpensive.

The Boxster/996 rear is a bit more pricey because of the adaptors needed. The fitment is very good with either a Carrera rear rotor or a 996 rear rotor, and simple to install. Note that these monobloc caliper pads are substantially more expensive than the Carrera or 930 pads. However as Bill mentioned, you lose some of what you hope to gain- some rear bias. The 930 rears are four 30mm pistons, whereas the Boxster/996 calipers are 30/28mm, so that's where added front bias comes from- the smaller rear pistons. You can gain a bit more rear brake torque by using a 996 rear rotor.

Shaun @ Tru6 · 01-02-2010, 08:05 AM

Thanks Tom. You know, my 84 stopped with authority and confidence both on and off the track. I'm a big fan of Carrera calipers and since my 73 is a solid 200 pounds lighter than my old Targa, they would offer more than enough braking. these Turbo fronts are a great opportunity, though overkill for my skill level, hard to pass up.

that's really what it comes down to.

ShakinJoe · 01-02-2010, 08:10 AM

Shaun,

I have a set of '87 930 calipers for sale if that is the route you go. The 930 rear rotor is an easy choice.

I am not buying what Mahler9th is saying. The engine is at the back of the car...so are the big tires. You want/need to take advantage of that with the brakes if you are going to race or DE the car.

Steve@Rennsport · 01-02-2010, 09:48 AM

Quote:

Originally Posted by Shaun 84 Targa

I believe the 930 calipers will just fit under deep 6s, is that correct?

Yessir, they will. You MIGHT need a 3mm spacer,.....

Quote:

I've always believed brakes are the most important part of the car so want to put the best I can weighing driving/use parameters against cost against opportunity.

Those are true words and I wholeheartedly agree. Its amazing to me how much money people will spend on their engine projects, but cringe at the thought about having a braking system to match.

It bears repeating that brake upgrades are not just about calipers; they are really about rotor size and making significant improvements in heat dissipation capacity. After all, THATS what allows one to go the distance at the track without any brake issues.

Shaun @ Tru6 · 01-02-2010, 01:56 PM

Thanks Joe, please email me with info.

Thanks again for your help Steve, now I really hope all this works out. This set-up would kill three birds with one stone.

911st · 01-02-2010, 03:24 PM

Is the Turbo-ft-rr/Carrera caliper setup ok without any kind of adjustable proportioning valve or is an adjustable one needed?

For anyone that has a Carrera that might follow, you will probably have to remove the stock PV if fitting 930's just up front.

I am not a brake expert.

BK911 · BK911's Garage

I am by no means a brake expert, but...

I use stock carrera calipers in a 1950# 73.5T with a 3.0. I don't see how you could possibly need more during DEs. If I really get on the brakes it feels like my eyeballs are going to hit the windshield.

I went for a ride with an instructor's 71T with stock T brakes. WOW. I think my eyeballs really did hit the windshield. I just don't see the need for turbo brakes.

My opinion of course. I would sell the Turbo brakes and use the money for a nice Carrera setup. IMO more than you will ever need.

Plus with 6" wide wheels will you have enough rubber for the brakes?

Bill Verburg · Bill Verburg's Garage

Quote:

Originally Posted by 911st

Is the Turbo-ft-rr/Carrera caliper setup ok without any kind of adjustable proportioning valve or is an adjustable one needed?

For anyone that has a Carrera that might follow, you will probably have to remove the stock PV if fitting 930's just up front.

I am not a brake expert.

You would definitely not want a p/v of any kind w/ 930 front 3.2 C rear

nor would you w/ 930 f/r