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924/931 4piston Brembo brake upgrade
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Raceboy  



Joined: 01 Mar 2004
Posts: 2318
Location: Estonia, Europe

PostPosted: Mon Nov 12, 2007 5:24 am    Post subject: 924/931 4piston Brembo brake upgrade Reply with quote

This upgrade uses 85-88 951 or non-M030 S2 brakes.
It requires that "5 lug upgrade" is already done.

1. Find a set of calipers, preferrably in very good condition. Clean them, paint them (if you want) and buy new pads of your choice of usage. I bought Ferodo DS Performance pads because I tend to go to the track and you never have too much brake power (well, almost).

2. Buy new rotors. If one can get used rotors in very good condition, fine, but prefer new ones since you want to upgrade your cars brakes, not otherwise. If stock 924/931 bodyshell is retained (no wheel arches etc), only rotors that fit, are from 1986 944 Turbo.
My friend used 1987- on 951 front rotors, that required either late style spindle/hub assembly (= you lose speedo cable hole) or turning down stock hub by some amount on the lathe to mount late style rotor. Since I haven't done it, I won't comment it more.

3. Rear brake assembly is bolt-on and no modification is needed. One may find that caliper bolts need washer as a spacer but I didn't use one.
Just remove stock caliper and old rotor, then install 951 units, and you're good to go. Dust shields work fine.

4. Fronts are more involved. Install rotors to the hubs, that is straight-forward job.
Then you need to fabricate adapters that connect caliper to spindle and it requires some machining skills. Thickness of the material is 11 mm. It's your call to mount caliper upper or lower from spindle bolts. I chose lower.
Arm that connects to steering ball joint has to be heated and bent by 5-7 mm's as thicker rotor would otherwise hit the ball joint. It will not hurt it's strength by any means and I consulted about it with professors from our technical university before I did it.
Dust-shields need to be custom made as any of the stock units won't fit with that caliper arrangement.

5. Put in new brake fluid. I used Ate Super Blue and it's the best I've used.

After bleeding the brakes, make proper bed-in process and enjoy the new stopping power and bling-bling factor
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'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11378
Location: PacNW

PostPosted: Mon Nov 12, 2007 9:56 am    Post subject: Re: 924/931 4piston Brembo brake upgrade Reply with quote

Raceboy wrote:
Arm that connects to steering ball joint has to be heated and bent by 5-7 mm's as thicker rotor would otherwise hit the ball joint.


You mean tie rod end here?

BTW, thanks a lot for the post.
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Toofah King Bad

  • Red (1987 924S) - Pro44/Spec944
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Raceboy  



Joined: 01 Mar 2004
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Location: Estonia, Europe

PostPosted: Tue Nov 13, 2007 4:25 am    Post subject: Reply with quote

No, not tie rod, but the arm of the spindle where tie rod ball joint connects to.
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'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
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Browar  



Joined: 02 Jan 2003
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Location: Warsaw,Poland

PostPosted: Mon Jan 07, 2008 5:46 am    Post subject: Reply with quote

I am very interested in more details. Maybe You could put some nice pictures. Please...
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Raceboy  



Joined: 01 Mar 2004
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Location: Estonia, Europe

PostPosted: Mon Jan 07, 2008 4:49 pm    Post subject: Reply with quote

I don't have much pics of the progress as I was too busy completing it for a track day but I guess I could take some pics this week when I put the car on the lifter.
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'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
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Rasta Monsta  



Joined: 12 Jul 2006
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PostPosted: Mon Jan 07, 2008 5:09 pm    Post subject: Reply with quote

Pics of your adapters would be great. . .prolly too late tho.
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Browar  



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PostPosted: Tue Jan 15, 2008 5:59 am    Post subject: Reply with quote

Because I am affraid of bending steering system I bought spindle, hub, calipers and I will try to put everything to my car.
I will try to make some pictures of road I took.
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Rasta Monsta  



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PostPosted: Tue Jan 15, 2008 6:11 am    Post subject: Reply with quote

951 spindles? I was thinking about that and wondering if the geometry would be too far off for that to work. Let us know what happens at the alignment shop.
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Raceboy  



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PostPosted: Tue Jan 15, 2008 6:28 pm    Post subject: Reply with quote

Alignment wouldn't be off with 951 spindles but you will have no speedo.

Bending the steering knuckle is nothing to be afraid of, because it's not made of some heat treated steel but usual forged iron. Before I did mine, I consulted with an engineer of material sciences from our technical university as I had concerns about the strength differences before and after and he said not to worry after examining the spindle.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
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Browar  



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PostPosted: Wed Jan 16, 2008 8:32 am    Post subject: Reply with quote

You MUST put pictures of what You exactly have. Nice, clear photos... Please
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Rasta Monsta  



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PostPosted: Wed Jan 16, 2008 8:43 am    Post subject: Reply with quote

Since the rear Brembos bolt on, you could also slap a pair of THESE up front. . .very interesting.
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Toofah King Bad

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bass gt  



Joined: 02 Dec 2004
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PostPosted: Sat Jan 19, 2008 8:19 am    Post subject: Reply with quote

Rasta,

Those Wilwoods are the very same i have on the racer. Work rather well too.

Steve
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crow.magnum  



Joined: 13 Oct 2007
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PostPosted: Mon Jan 21, 2008 11:20 pm    Post subject: Re: 924/931 4piston Brembo brake upgrade Reply with quote

Raceboy wrote:


3. Rear brake assembly is bolt-on and no modification is needed. One may find that caliper bolts need washer as a spacer but I didn't use one.
Just remove stock caliper and old rotor, then install 951 units, and you're good to go. Dust shields work fine


can i just double check are you saying 951 four pot calipers will fit straight on to the rear of my 931 5 stud? is this with 931 discs or 951 discs. (ive got gt kit on)

thanks
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Browar  



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PostPosted: Tue Jan 22, 2008 5:42 am    Post subject: Reply with quote

I know it just bolts on to 924S using factory small spacers (shims) - but I don`t know about 931...
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Raceboy  



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PostPosted: Wed Jan 23, 2008 12:54 am    Post subject: Reply with quote

Yes, 951 rear calipers bolt right on, you may need washers as a spacer. And obviously only with 951 rotor.
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'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche
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