 Brake Question, Front on Rear with 6 Rotor |
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| Robarabian |
 Jan 4 2021, 02:38 PM
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#1
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914 A Roo  Group: Members Posts: 592 Joined: 11-February 19 From: Simi Valley, Kalifornia Member No.: 22,865 Region Association: Southern California 
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Hi everyone,
I saw a Facebook post that made me want to ask this question from those that know more. The poster is converting his car to a 5 lug setup. From the post, it appears he put front stock 914 calipers on the rears. From what I can glean, he took measurements with the dust cover on and off and ended up with a 3mm gap with them on using an adapter of some sort. Has anyone heard of doing this? He mentioned losing the e brake, but is there some advantage to this, fronts on rear? Would the Rear calipers from a stock 914 not fit a SIX rear disc? Is the SIX Rotor thicker, ie., they are not a just convert to 5 lug and go setup? Things I am still learning file?Sorry if this is a dumb question, but I thought the post was intriguing. |
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Replies(1 - 9)
| Montreal914 |
Jan 4 2021, 03:20 PM
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#2
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Senior Member Group: Members Posts: 1,560 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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You are not talking about what he used in the front, but here is some information:
914/4; front calipers piston diameter: 42mm Rear calipers piston diameter: 33mm Front rotor thickness: ? Rear rotor thickness: 9.4mm Master cylinder 17mm 914/6; front calipers piston diameter: 48mm Rear calipers piston diameter: 38mm Front rotor thickness (vented): ? Rear rotor thickness: 10.4mm, diameter is also 3mm larger if I recall Master cylinder 19mm |
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| mepstein |
Jan 4 2021, 03:23 PM
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#3
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914-6 GT in waiting Group: Members Posts: 19,276 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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The rear six rotor is a couple mm larger diameter than the one on a four. It can be trimmed down to fit the 914-4 caliper. It's the same width as a four rotor. The solid 911T rotor is easy to find and is the same size as the 914-6 rotor.
I would rather just have rebuilt rear calipers with good pads, new soft lines, etc than rig stuff up and not have an e-brake. |
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| Montreal914 |
Jan 4 2021, 03:26 PM
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#4
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Senior Member Group: Members Posts: 1,560 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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QUOTE(mepstein @ Jan 4 2021, 01:23 PM)  The rear six rotor is a couple mm larger diameter than the one on a four. It can be trimmed down to fit the 914-4 caliper. It's the same width as a four rotor. The solid 911T rotor is easy to find and is the same size as the 914-6 rotor. 914/6 rears are 10.4mm thick, whereas 914/4 are 9.4mm. I compared two new Zimmemann rotors by measuring them. (IMG:style_emoticons/default/smile.gif) |
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| mepstein |
Jan 4 2021, 03:51 PM
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#5
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914-6 GT in waiting Group: Members Posts: 19,276 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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QUOTE(Montreal914 @ Jan 4 2021, 04:26 PM) QUOTE(mepstein @ Jan 4 2021, 01:23 PM) The rear six rotor is a couple mm larger diameter than the one on a four. It can be trimmed down to fit the 914-4 caliper. It's the same width as a four rotor. The solid 911T rotor is easy to find and is the same size as the 914-6 rotor. 914/6 rears are 10.4mm thick, whereas 914/4 are 9.4mm. I compared two new Zimmemann rotors by measuring them. (IMG:style_emoticons/default/smile.gif) My mistake then. I thought they were the same. The 911T rotor fit fine between the new pads on my 914-4 caliper. |
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| Mark Henry |
Jan 4 2021, 03:57 PM
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#6
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Cheapest and easiest way is to keep it stock and just get the hubs welded up and drilled.
You need an ebrake to be street legal. |
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| JOEPROPER |
Jan 4 2021, 04:25 PM
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#7
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The answer is "no" unless you ask... Group: Members Posts: 1,184 Joined: 21-November 15 From: White Plains New York Member No.: 19,387 Region Association: North East States
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I put 914-6 rear rotors on my rear with 911 hubs. I had to machine the rotor diameter to allow them to fit. The cost to send out, redrill and send back rotors was way to high, so i put the 6 rotors on a brake lathe and shaved down the diameter. I got the rotors from WorldPac. Parking brake is not effected.
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| Robarabian |
Jan 4 2021, 10:06 PM
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#8
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914 A Roo Group: Members Posts: 592 Joined: 11-February 19 From: Simi Valley, Kalifornia Member No.: 22,865 Region Association: Southern California
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Thanks everyone. This was educational for sure.
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| Cairo94507 |
Jan 5 2021, 08:56 AM
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#9
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Michael Group: Members Posts: 9,770 Joined: 1-November 08 From: Auburn, CA Member No.: 9,712 Region Association: Northern California
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I would definitely not want to be driving a street car w/o an emergency brake. I set my brake and leave my car in gear if parked on a slope. On level ground I leave it in neutral and set the brake. (IMG:style_emoticons/default/beerchug.gif)
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| brant |
Jan 5 2021, 09:29 AM
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#10
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914 Wizard Group: Members Posts: 11,625 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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QUOTE(Robarabian @ Jan 4 2021, 01:38 PM) Hi everyone, I saw a Facebook post that made me want to ask this question from those that know more. The poster is converting his car to a 5 lug setup. From the post, it appears he put front stock 914 calipers on the rears. From what I can glean, he took measurements with the dust cover on and off and ended up with a 3mm gap with them on using an adapter of some sort. Has anyone heard of doing this? He mentioned losing the e brake, but is there some advantage to this, fronts on rear? Would the Rear calipers from a stock 914 not fit a SIX rear disc? Is the SIX Rotor thicker, ie., they are not a just convert to 5 lug and go setup? Things I am still learning file?Sorry if this is a dumb question, but I thought the post was intriguing. regarding your original question the EARLY style of front caliper can be put onto the rear of a 914 with a washer as a spacer. there are some reasons for this I'm running this rear brake. my race club rules talk about period correct brakes... (no wilwoods, or giant disc brake set ups on mustangs for instance) moving the front caliper to the rear is a period correct upgrade its allows for a larger caliper on the back... much cheaper than a set of 914/6 rear calipers... my car is trailered, race only I run the 911S aluminum calipers on front and the front brakes on the rear to help balance my set up its possible there are reasons I don't need an emergency brake (extra weight... on a race car) brant |
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