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4 to 6 conversion: rear brakes

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bossboy302	Mar 11 2023, 11:53 AM Post #1
Member Group: Members Posts: 88 Joined: 13-December 21 From: NorCal Member No.: 26,158 Region Association: None	Collecting the bits for my project, (4 to 6) rear brake question... Are the rear 4 rotors the same thickness as 6? If so, can the 4 rear calipers (with their parking brake) be used? I am doing the 5-lug. Thanks in advance

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JmuRiz	Mar 14 2023, 10:40 AM Post #2
914 Guru Group: Members Posts: 5,623 Joined: 30-December 02 From: NoVA Member No.: 50 Region Association: MidAtlantic Region	Eric, is it possible to space out a stock 914/4 rear caliper to use vented rear disks?

Eric_Shea	Mar 14 2023, 10:44 AM Post #3
PMB Performance Group: Admin Posts: 19,304 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains	QUOTE(JmuRiz @ Mar 14 2023, 10:40 AM) Eric, is it possible to space out a stock 914/4 rear caliper to use vented rear disks? Yes, but "why?" is the question. A stock 914 rear caliper will never heat up a solid rotor enough to require a vented rear. We had them made in the past but when you look into it, it just doesn't make sense. BMW 3.0CSi rear calipers have the spacers and the fasteners required for this conversion. Hens teeth (IMG:style_emoticons/default/wink.gif)

JmuRiz	Mar 14 2023, 01:07 PM Post #4
914 Guru Group: Members Posts: 5,623 Joined: 30-December 02 From: NoVA Member No.: 50 Region Association: MidAtlantic Region	QUOTE(Eric_Shea @ Mar 14 2023, 08:44 AM) QUOTE(JmuRiz @ Mar 14 2023, 10:40 AM) Eric, is it possible to space out a stock 914/4 rear caliper to use vented rear disks? Yes, but "why?" is the question. A stock 914 rear caliper will never heat up a solid rotor enough to require a vented rear. We had them made in the past but when you look into it, it just doesn't make sense. BMW 3.0CSi rear calipers have the spacers and the fasteners required for this conversion. Hens teeth (IMG:style_emoticons/default/wink.gif) Good to know, I have solids and will relay this into to me brother. Easier to go back to 914/4 rears and solid disks than fab up a 911 style e-brake. I'm sure he'll write you about while waiting for his 2300i

Eric_Shea	Mar 15 2023, 08:50 AM Post #5
PMB Performance Group: Admin Posts: 19,304 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains	QUOTE(JmuRiz @ Mar 14 2023, 01:07 PM) QUOTE(Eric_Shea @ Mar 14 2023, 08:44 AM) QUOTE(JmuRiz @ Mar 14 2023, 10:40 AM) Eric, is it possible to space out a stock 914/4 rear caliper to use vented rear disks? Yes, but "why?" is the question. A stock 914 rear caliper will never heat up a solid rotor enough to require a vented rear. We had them made in the past but when you look into it, it just doesn't make sense. BMW 3.0CSi rear calipers have the spacers and the fasteners required for this conversion. Hens teeth (IMG:style_emoticons/default/wink.gif) Good to know, I have solids and will relay this into to me brother. Easier to go back to 914/4 rears and solid disks than fab up a 911 style e-brake. I'm sure he'll write you about while waiting for his 2300i Aa's going on the engine run-in stand today. Zach should be out the door... (IMG:style_emoticons/default/wink.gif)

Posts in this topic

bossboy302 4 to 6 conversion: rear brakes Mar 11 2023, 11:53 AM

mgphoto Collecting the bits for my project, (4 to 6) rear... Mar 11 2023, 12:01 PM

Superhawk996 The real reason to go to /6 calipers is due to the... Mar 11 2023, 12:31 PM

mepstein Collecting the bits for my project, (4 to 6) rear... Mar 11 2023, 01:24 PM

mlindner Or if you are not in need of the parking brake, yo... Mar 11 2023, 01:40 PM

Eric_Shea Or if you are not in need of the parking brake, y... Mar 14 2023, 10:34 AM

bossboy302 Thanks all for quick replies... Have done some re... Mar 11 2023, 01:58 PM

zoomCat Be aware that the 911 brakes on the front have a p... Mar 11 2023, 03:09 PM

mepstein Thanks all for quick replies... Have done some r... Mar 11 2023, 03:14 PM

bossboy302 Ohhh....I probably got the nomenclature wrong, I m... Mar 11 2023, 04:04 PM

mepstein Ohhh....I probably got the nomenclature wrong, I ... Mar 11 2023, 04:07 PM

bossboy302 Hoping these would work... https://www.pelicanpar... Mar 11 2023, 04:19 PM

mepstein Hoping these would work... https://www.pelicanpa... Mar 11 2023, 04:28 PM

bossboy302 IIIII...like it! That is my hope. I thought b... Mar 11 2023, 04:40 PM

mgphoto Collecting the bits for my project, (4 to 6) rear... Mar 11 2023, 05:45 PM

mepstein Collecting the bits for my project, (4 to 6) rea... Mar 11 2023, 06:48 PM

mgphoto [quote name='mgphoto' post='3064301' date='Mar 11... Mar 11 2023, 07:11 PM

mepstein [quote name='mgphoto' post='3064301' date='Mar 1... Mar 11 2023, 07:52 PM

technicalninja Those flanges allow the 914/6 rear rotors to use b... Mar 11 2023, 07:45 PM

technicalninja Not having one of the screws installed doesn't... Mar 11 2023, 07:55 PM

Chris914n6 Rear rotor centers from the backside on the outer ... Mar 11 2023, 10:15 PM

mepstein Rear rotor centers from the backside on the outer... Mar 12 2023, 07:48 AM

Steve Compare the pad size of a 914-4 rear caliper to a ... Mar 12 2023, 12:35 AM

zoomCat Compare the pad size of a 914-4 rear caliper to a... Mar 12 2023, 12:06 PM

Superhawk996 Compare the pad size of a 914-4 rear caliper to ... Mar 12 2023, 01:02 PM

zoomCat [quote name='zoomCat' post='3064542' date='Mar 12... Mar 12 2023, 01:40 PM

mepstein [quote name='zoomCat' post='3064542' date='Mar 1... Mar 12 2023, 01:46 PM

zoomCat Yes. 914-6 rear calipers are basically an M calip... Mar 12 2023, 01:59 PM

Eric_Shea Yes. 914-6 rear calipers are basically an M cali... Mar 14 2023, 10:39 AM

technicalninja Rear rotor centers from the backside on the outer... Mar 12 2023, 12:42 AM

mb911 One note for those thinking about doing this. I al... Mar 12 2023, 02:11 PM

hencar I agree with Ben and admittedly haven't read a... Mar 12 2023, 04:44 PM

Montreal914 Actually, rear rotors are different in thickness. ... Mar 13 2023, 09:12 AM

mepstein Actually, rear rotors are different in thickness.... Mar 13 2023, 09:29 AM

Eric_Shea Actually, rear rotors are different in thickness.... Mar 14 2023, 10:40 AM

dr914@autoatlanta.com we can use stock six rotors with the aftermarket 9... Mar 13 2023, 09:39 AM

dflesburg Here is how I made it work 911 rear brakes - e br... Mar 14 2023, 06:46 AM

JmuRiz Eric, is it possible to space out a stock 914/4 re... Mar 14 2023, 10:40 AM

Eric_Shea Eric, is it possible to space out a stock 914/4 r... Mar 14 2023, 10:44 AM

JmuRiz Eric, is it possible to space out a stock 914/4 ... Mar 14 2023, 01:07 PM

Eric_Shea [quote name='Eric_Shea' post='3065024' date='Mar ... Mar 15 2023, 08:50 AM

mgphoto See photo <———- I’m using the vented r... Mar 14 2023, 11:26 AM

rudedude Does anyone have experience with the URO hub for 5... Mar 15 2023, 08:45 AM

Eric_Shea Does anyone have experience with the URO hub for ... Mar 15 2023, 09:57 AM

rudedude Thanks Eric for the encouraging words Jule Mar 15 2023, 01:03 PM

IronHillRestorations If you want 914-6 rear calipers, send me a PM. I h... Mar 15 2023, 07:25 PM

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