 Help with Brake Upgrade, Rear Vented rotors |
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| Racing916 |
 Nov 16 2009, 08:00 PM
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#1
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Member  Group: Members Posts: 341 Joined: 16-October 04 From: Binghamton, NY Member No.: 2,959 Region Association: North East States  |
hello,
I am currently upgrading my 914-6 to vented rotors. My hope was to take a Front "M" caliper and mount it on the rear using the 911 (69-83 Rear) vented rotors. I mock fitted the caliper and rotor and it looks like I need to place a small spacer between the caliper and the mount on the rear trailing arm (not a problem) The issue is the 911 rotors get larger as you get closer to the brake surface and rub on the "M" Calipers. Has anyone else had this issue? I realize they are larger for the parking brake, is there a parking brake delete option? 914-6GT vented rotors, suppliers? Thanks for any help, back to the drawing board! Steve |
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| davep |
Nov 16 2009, 08:51 PM
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#2
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914 Historian Group: Benefactors Posts: 5,151 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada  |
What M calipers are you wanting to use on the rear? 48mm 911 front, 42mm 914/4 front, or 42mm 911SC rear, or 38mm 911 rear?
All take the M pads, but there are big differences in the size of the caliper. I would not use the 48mm fronts, they are just too large. I don't know of any 911 or 944 variant that uses such a large piston area on the rear of the car; it just unbalances the braking so much. The 914/6GT rear rotor is a perfect fit for the rear when a 20mm thick rotor is called for. |
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| Racing916 |
Nov 16 2009, 08:57 PM
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#3
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Member Group: Members Posts: 341 Joined: 16-October 04 From: Binghamton, NY Member No.: 2,959 Region Association: North East States |
QUOTE(davep @ Nov 16 2009, 06:51 PM)  What M calipers are you wanting to use on the rear? 48mm 911 front, 42mm 914/4 front, or 42mm 911SC rear, or 38mm 911 rear? All take the M pads, but there are big differences in the size of the caliper. I would not use the 48mm fronts, they are just too large. I don't know of any 911 or 944 variant that uses such a large piston area on the rear of the car; it just unbalances the braking so much. The 914/6GT rear rotor is a perfect fit for the rear when a 20mm thick rotor is called for. Dave, The calipers are in my dads garage but they were fronts of a early 911, I am thinking they are a 48mm but I could be wrong. Is the 48 MM to big if I am using Wide "A" calipers up front with a proportiong valve to adjust? I think I might have jumped in the deep end without doing enough research, I will measure the calipers tomorrow and see. Thanks Steve |
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Posts in this topic
Racing916 Help with Brake Upgrade Nov 16 2009, 08:00 PM
Jeffs9146 I think it is easier to put the spacers between th... Nov 16 2009, 08:18 PM Van914 Steve,
That is the set up I am running on my car. ... Nov 16 2009, 08:29 PM
Racing916
Steve,
That is the set up I am running on my car.... Nov 16 2009, 08:38 PM Eric_Shea 48mm pistons on the rear?
OK... I give up. :wack... Nov 16 2009, 08:33 PM Racing916
48mm pistons on the rear?
OK... I give up. :wac... Nov 16 2009, 08:40 PM Racing916 Thanks for the reply Jeff. I would think shrinkin... Nov 16 2009, 08:36 PM Eric_Shea Use "Rear" M-Calipers with the #31 pad (... Nov 16 2009, 08:43 PM Racing916
Use "Rear" M-Calipers with the #31 pad ... Nov 16 2009, 08:49 PM Racing916 Eric,
Sorry I read your reply fast and did not se... Nov 16 2009, 09:03 PM Eric_Shea
No. It's not made for that application.
As... Nov 16 2009, 08:59 PM Eric_Shea
Install rear M-Calipers and fret no more, especi... Nov 16 2009, 09:06 PM Eric_Shea
Like "other" 911 items, we use them as... Nov 16 2009, 09:08 PM brant I've had vented rear rotors on a 914....
absol... Nov 16 2009, 09:17 PM Racing916
I've had vented rear rotors on a 914....
abso... Nov 16 2009, 09:37 PM J P Stein I ran SC rears with S fronts. The stock 4 pooper r... Nov 16 2009, 09:28 PM brant I think I'm a bit outgunned JP!
at one of... Nov 16 2009, 09:34 PM Eric_Shea
Agree... that said, there's only about 4.2lb... Nov 16 2009, 09:41 PM brant
Agree... that said, there's only about 4.2l... Nov 16 2009, 09:56 PM brant what pads?
you can buy pads to run in different te... Nov 16 2009, 09:44 PM Racing916
what pads?
you can buy pads to run in different t... Nov 16 2009, 09:50 PM brant no.. my front KFP's last 2times longer than m... Nov 16 2009, 09:54 PM Racing916
no.. my front KFP's last 2times longer than ... Nov 16 2009, 10:07 PM Van914 Racing916,
I bought my vented rotors here: http://... Nov 17 2009, 06:03 AM 914Sixer There is a correct rotor for the 914-6 racing appl... Nov 17 2009, 07:52 AM Racing916 Brake Update Pictures of the front and rears, than... Dec 4 2009, 06:58 PM Racing916 front Dec 4 2009, 06:59 PM Racing916 rear Dec 4 2009, 07:00 PM Eric_Shea :trophy: Dec 4 2009, 09:03 PM Racing916
:trophy:
Thanks for all your input Eric! Dec 5 2009, 07:20 AM charliew I always thought that if you need to pump the brak... Dec 5 2009, 10:34 AM Krieger914 So is it worth it, and is it possible to get the r... Feb 23 2010, 11:11 PM Eric_Shea
Andy, in Steve's situation... maybe. In mos... Feb 24 2010, 09:44 AM Krieger914 So what "m" rears are they: 84-89? for ... Feb 24 2010, 09:51 AM Eric_Shea 1969 through 1983. The 84-89 have larger pistons ... Feb 24 2010, 09:56 AM 914Sixer Rear 914-6 GT vented rotors(901.352.041.12)were st... Feb 24 2010, 07:34 PM |
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