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joemac
Joined: 22 Apr 2013
Posts: 44
Location: SE Pa.
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 Posted: Wed Apr 24, 2013 8:45 am Post subject: Four-Lug Vented Rotors(?) |
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The boy and I are putting his mother's '79 NA 924 back on the road.
He was asking me if there are vented rotors available.
I told him I'd find out.
So...
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daniel
Joined: 18 Jun 2009
Posts: 686
Location: Sydney, Australia
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| Posted: Wed Apr 24, 2013 9:21 am Post subject: |
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Yes
Early model Audi A4's use a bigger caliper and vented rotor that will bolt straight up
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Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
1977.5 Race Car, CAMS Group S Spec
1989 944 Cabriolet |
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nickthompson
Joined: 26 Mar 2013
Posts: 873
Location: Central Georgia
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| Posted: Wed Apr 24, 2013 10:21 am Post subject: |
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| daniel wrote: | Yes
Early model Audi A4's use a bigger caliper and vented rotor that will bolt straight up |
If that is true why isn't done more often. |
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fiat22turbo
Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR
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| Posted: Wed Apr 24, 2013 12:02 pm Post subject: |
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Because it isn't widely known, doesn't address possible brake balance issues nor does it deal with the real issue, the rear drums and their lack of auto adjustment.
At the end of the day it is easier to find/buy a scrapped 944/924S and steal the brakes and updated suspension parts from under it.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose) |
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Raceboy
Joined: 01 Mar 2004
Posts: 2327
Location: Estonia, Europe
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| Posted: Wed Apr 24, 2013 4:27 pm Post subject: |
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| fiat22turbo wrote: | Because it isn't widely known, doesn't address possible brake balance issues nor does it deal with the real issue, the rear drums and their lack of auto adjustment.
At the end of the day it is easier to find/buy a scrapped 944/924S and steal the brakes and updated suspension parts from under it. |
Or use Peugeot 405 rear discs and calipers like AndrewNZ did.
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'83 924 2.6 16v Turbo, 470hp
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gegge
Joined: 27 Jul 2007
Posts: 1124
Location: Sweden
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| Posted: Wed Apr 24, 2013 5:32 pm Post subject: |
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| daniel wrote: | Yes
Early model Audi A4's use a bigger caliper and vented rotor that will bolt straight up |
Didnīt know that. IIRC does the Porsche disc contain a hub for the bearings as well. Since Audis usually are FWD I asume that there is more to it than just bolt-on the Audi disc and caliper?
I have been looking at Audi 80 and 100 from 73-94 with 256mm discs.
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joemac
Joined: 22 Apr 2013
Posts: 44
Location: SE Pa.
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| Posted: Thu Apr 25, 2013 6:40 am Post subject: |
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Wow! Thanks for the tip.
How early, and do you have to use the Audi calipers along with the rotors?
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bunta
Joined: 21 Sep 2006
Posts: 49
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| Posted: Thu Apr 25, 2013 6:40 am Post subject: |
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| Raceboy wrote: |
Or use Peugeot 405 rear discs and calipers like AndrewNZ did. |
Do you have the url ? |
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joemac
Joined: 22 Apr 2013
Posts: 44
Location: SE Pa.
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| Posted: Tue Apr 30, 2013 11:43 am Post subject: |
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All of the images of early A4's show five-bolt wheels.
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Cedric
Joined: 27 Aug 2004
Posts: 2818
Location: Sweden
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| Posted: Tue Apr 30, 2013 3:37 pm Post subject: |
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| nickthompson wrote: | | daniel wrote: | Yes
Early model Audi A4's use a bigger caliper and vented rotor that will bolt straight up |
If that is true why isn't done more often. |
Because the std brakes are can cope with all kind of punishment if they are fresh and have good pads. I could drive all day long on track as hard as I wanted without any fade at all. The result of just throwing on bigger front brakes will probably give you a longer brake distance since you messed up the brake balance. As pointed out earlier, it was the lack of auto adjustment at the rear that was annoying me when I frequently track drove my n/a, and the squishy pedal feel I couldnt get rid off. But just changing to bigger front brakes for street driving is just waste of time/bling  . As pointed out, its better to just take the whole system from a 924S/turbo/944 instead.
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Raceboy
Joined: 01 Mar 2004
Posts: 2327
Location: Estonia, Europe
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morghen
Joined: 21 Jan 2005
Posts: 9102
Location: Romania
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| Posted: Tue Apr 30, 2013 7:38 pm Post subject: |
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I dont think any audi bits will work.
First...audis are FWD, second, 4 lug audis are 4x100 not 4x108...
The Peugeot swap works and its proven.
I agree...good 924 NA brakes are VERY good. All you have to do is buy good pads, have good disks, and take good care of the rears.
Werent the later model 924s auto-adjusting ? i mean the rear drums..
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joemac
Joined: 22 Apr 2013
Posts: 44
Location: SE Pa.
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| Posted: Wed May 01, 2013 3:25 am Post subject: |
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| morghen wrote: |
I agree...good 924 NA brakes are VERY good. All you have to do is buy good pads, have good disks, and take good care of the rears.
Werent the later model 924s auto-adjusting ? i mean the rear drums.. |
Well, the year or so that I drove my 924 with its standard brakes, they seemed fine to me. Granted, i was used to driving a '67 Beetle as my daily driver...
I'll tell the boy to just leave them as is.
The VW Type III had a self-adjusting rear brake option in the later years. I'm researching the subject to see about finding the necessary hardware. The drums were separate from the hub, that much I remember.
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gohim
Joined: 02 Nov 2002
Posts: 4459
Location: Rialto, CA
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| Posted: Thu May 09, 2013 7:56 am Post subject: |
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The standard solid front discs with rear drums work fine for street use, even on a daily, as long as you keep up with the rear brake shoe adjustment.
I converted to four wheel discs and five-bolt wheels fifteen years ago, and never regret doing the conversion.
It's bolt-on, and for your effort you get rid of the rear drum brake adjust problem, AND improve brake performance. I've found that the brake pedal is higher and firmer with the original master cylinder (my car is an 81) than it ever was with the old brake setup. The larger vented front and rear discs easily out brake the original disc/drum combination (even on their best days) under heavy use.
The conversion doesn't even cost that much money any more, since 944 donor cars can be found in most self-service salvage yards today.
And I don't know anybody who will argue that phone dials don't look better on a 924 than the Factory 4-bolt 14" alloys or steel wheels. To me, the shape of the holes in the wheels compliments the classic shape of the 924. |
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924 FAQ (Technical)
