will they work on a 914-4 front caliper in place of the normal brake hard line fitting?

It appears that M caliper bolt and banjo fit on a -4 front caliper. It fit up snugly, with no wiggles, nor did the bolt bottom out inside the bolt hole.

I don't know if the mounting face of the caliper where the banjo goes is flat enough to properly seal.

Out with it... what the hell are you trying to do?

I thought you would figure it out Eric.

I am doing the cardinal no...no. I put my 914-4 fronts on the rear.
I know, I know....piston sizes and all that.

I just did not like the adjusting and all with the 914-4 rears. PITB. My hang up. I like just compressing the pistons and sliding in some new pads....clean simple, quick. Espeically at the track. got spoiled with my 944 turbo and Boxster at the track.

I am running M calipers up front with vented rotors and Porterfield R-4Es and basically stock PBRs on the rear with a "T". I am going to give it a try and see how it works. I had a 914-6 with JFZ 4 piston calipers at all 4 corners that worked very well.
The Ms and the stockers will give me some front bias....we will see.
I still have the stock rears so if it doesn't work out I will go back to the stock rears with competition pads.

Nothing ventured nothing gained....sometimes you just have to try it yourself.
And maybe screw up or maybe not.

I was going to use a banjo fitting to hook up the front calipers to the rear hard lines...but just "readjusted the existing hard lines to work without the banjos.

Hey Dan,

I think Larry Sharp did the same thing with his 'Sunoco' 914-6

If I remember right, it worked good for him

Well then I guess I am on to absolutely nothing that hasn't been done before

Talked to Gabe a couple of weeks ago....said he and his partner sold the 914-6. I guess they are both into motorcycles now!

Like I said if the balance is off I can either go back to the stocker rears, or I can install an adjustable bias valve.

Got my oil lines today. Will run them sometime this week and then it is ready to go to Sportech for the alignment and a few other goodies. Should be ready for BW with time to spare.

Do you have a prop valve?

I'd spend some time in an empty parking lot if I were you making sure they lock up in the right order.... be safe man.

QUOTE (fiid @ Mar 27 2006, 03:49 PM)

Do you have a prop valve? I'd spend some time in an empty parking lot if I were you making sure they lock up in the right order.... be safe man.

QUOTE

Like I said if the balance is off I can either go back to the stocker rears, or I can install an adjustable bias valve.

After a short phone discussion with one of the weirdos that hangs out on this board, I think I found a way to do away with the rear adjusters...

Also... you're putting a piston on there that Porsche didn't use until 1984 (but you know... piston size) I would keep the P-Valve or FOR SURE... get an adjustable one. CIP1 has one for $45 clams that could be mounted in the cockpit.

QUOTE

Talked to Gabe a couple of weeks ago....said he and his partner sold the 914-6. I guess they are both into motorcycles now!

I know where it went! It will be at Buttonwillow with its new owner for the PCA DE so you can check out the brake setup if still needed by then...

QUOTE (Eric_Shea @ Mar 27 2006, 03:20 PM)

QUOTE Like I said if the balance is off I can either go back to the stocker rears, or I can install an adjustable bias valve. After a short phone discussion with one of the weirdos that hangs out on this board, I think I found a way to do away with the rear adjusters... Also... you're putting a piston on there that Porsche didn't use until 1984 (but you know... piston size) I would keep the P-Valve or FOR SURE... get an adjustable one. CIP1 has one for $45 clams that could be mounted in the cockpit.

I'm listening

I will be very cautious and slowly build up speed, until I am familiar and comfortable with the new set up. If I need an adjustable prop valve then I will try one. Still have the stock prop valve....sitting on the floor after removal from car.

I just took it out....a few weeks ago, before I decided to try this.

Let me know if you want to explore the rears without the adjusters. I think we can make it work. You'd be the Guinea Pig but from the tone of that last post (the one you deleted) ... you can handle it.

Thanks Eric...what would we need to do.

yah, I decided that post was a little over the top for me....

I take things very carefully when I make changes to my cars....and don't plan on going out and doing a bonzai run on my local expressway
You don't get as far as I have gone with track and AX driving without developing a healthy dose of reality and care.

The deletion of the adjusters sounds very interesting....let me know how we would proceed.

Eric,
now that we are on the subject what are the piston sizes for the front and rear of a '84 Carrera vs. M front caliper and 914-4 front caliper.

I want to run the ratios.

M Front = 48mm
M Rear = 38mm
914 Front = 43mm
914 Rear = 33mm
914-6 Rear = 38mm
Later M Rear = 42mm (this was the first 911 with a P-Valve BTW... )

Remove the adjuster mechanism from inside the piston. Leave the adjusters of course (because they have the seals), but, in theory, those should work like regular brakes.

Thanks Eric.
I had looked at some old posts and found the sizes. 48v42 and 42v33.
.875 and .79 respectively on percentage of piston sizes.
48v33 is .69

I am going to try to off set the ratio by using a very mild street pad on the rear to go with the Porterfields up front on the Ms.
Will try this for one day in mid April at BW. If I have issues with this then I will reinstall the stock pvalve. If I don't do that I may just put in an adjustable pvalve and be done with it. I like the 914 fronts on the rear....I guess I am just a glutton for punishment

I will report here my observations after my first track day, then you all may be able to say you told me so
If I dont like that I may try to find a set of rear M calipers and go with vented rear rotors...although I don't know if I can get 4 lug vented rears...may have to have some redrilled if possible. Have you seen this done Eric, for 4 bolt rears?

a couple pics of the offending items

I hope I can get them to work properly for me. They bolt on so easily and will be much easier to change pads.

and here is the shot of the reason I started this thread. I thought about using a banjo fitting to make the top feed hard line stay top feed. After much thought and discussion with my personal 914 gurus, I decided to massage the existing hard line to become a side feed line. As you can see it works just fine, if you take your time and don't kink the line.

QUOTE

then you all may be able to say you told me so

I doubt it... sounds like you're on the right track with the pads.

Rear M's should work as well. I'll bet if you took the spacers out of a rear M they'd bolt right up... no need to redrill the vented rotors. That would be my choice given your current sit-chee-ation. (send me the spacers and bolts when and if you do...)

Thanks for the words Eric. If I find a set of rear Ms I will give the removal of the spacers a try. Now that I have some measurements I think it might work.
And if it works I will send you the "extra pieces"

You'll get the side mouting brake line you want and I do believe the measurement will be correct.

To get an M to work with a vented rotor on a teener you need a 5mm spacer behind the rotor. Exactly the same spacer you need to get a V-Caliper to work. Take away your 10mm caliper 1/2 spacers and that 5mm rotor spacer and you've got yourself a caliper that will bolt on a stock teener rotor.