Rear brake upgrade (again, lol), Or,how to get a vented rotor |
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Rear brake upgrade (again, lol), Or,how to get a vented rotor |
HalfMoon |
Jun 29 2017, 06:08 PM
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#1
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Senior Member Group: Members Posts: 828 Joined: 13-November 12 From: Shenandoah Junction, WV Member No.: 15,144 Region Association: MidAtlantic Region |
So I know this has been talked to death thousands of times and when I do a google search there's reems of information, but rather than spend the entire evening reading through many posts that really aren't relevant, I thought I would pose the question and see what turns up.
Recently I had a four wheel alignment and corner balance done by a really great and well known shop out my way (who are very familiar with track cars for my local track-Summit Point) and when I asked the primary mechanic today what things he might suggest for my sbc Sheridan standard wide-body conversion, he said upgrading my rear brakes would be pretty important for that track. Soooo, yes there are lots of ways to go to be sure but I was wondering about retaining the standard rear 914 brake (and e-brake) but using the vented 911 SC rotor? Do I recall Eric made/makes a spacer for this or is/was that for converting 914 fronts to rears? A lil confused this particular application. I like the idea of retaining the stock 914 rear calipers if I can but I really want to go to vented rotor (as opposed to drilled). Thoughts? |
Spoke |
Jun 29 2017, 07:30 PM
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#2
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Jerry Group: Members Posts: 7,052 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
I added spaced 914 rear calipers and 911 rear vented rotors cut down by Eric Shea. My progress thread has some info and pics on my upgrade.
You need a spacer between the rotor and the hub to properly space the rotor in the caliper. One thing I ran into with the spacer is when the spacer is placed between the rotor and the hub, the rotor loses it's centering capability on the hub. In this case the little screw that holds the rotor is important to setting the rotor in the center of the hub. Also the 911 rear rotor screw placement is not in the same place as the 914 hub. I had to drill and tap a new hole in the hub. Spoke's Progress Thread |
HalfMoon |
Jun 29 2017, 09:30 PM
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#3
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Senior Member Group: Members Posts: 828 Joined: 13-November 12 From: Shenandoah Junction, WV Member No.: 15,144 Region Association: MidAtlantic Region |
I added spaced 914 rear calipers and 911 rear vented rotors cut down by Eric Shea. My progress thread has some info and pics on my upgrade. You need a spacer between the rotor and the hub to properly space the rotor in the caliper. One thing I ran into with the spacer is when the spacer is placed between the rotor and the hub, the rotor loses it's centering capability on the hub. In this case the little screw that holds the rotor is important to setting the rotor in the center of the hub. Also the 911 rear rotor screw placement is not in the same place as the 914 hub. I had to drill and tap a new hole in the hub. Spoke's Progress Thread Makes me wonder if a spacer between the caliper and the attachment point could be used to center it? This would retain the rotors "centering ability", no? |
bdstone914 |
Jun 29 2017, 09:51 PM
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#4
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bdstone914 Group: Members Posts: 4,673 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
Makes me wonder if a spacer between the caliper and the attachment point could be used to center it? This would retain the rotors "centering ability", no?
[/quote] No. Rotors do not center themselves. The caliper can be spaced to center on the rotor if needed. You need the spacer between the caliper halves to allow the caliper to go around the rotor the thicker rotor. The caliper is in the correct position. What is the use of the car that makes you think vented rears are needed? Doing a lot of repeated high speed braking? Or is this just something you want to do ? Does not hurt anything other then adding more unsprung weight in the rear. Or is this just something you want to do? Yes a 69-73 911 rear rotor thatare 20mm thick will work. What calipers and rotors are on the front ? Or is this just something you want to do ? |
HalfMoon |
Jun 29 2017, 10:04 PM
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#5
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Senior Member Group: Members Posts: 828 Joined: 13-November 12 From: Shenandoah Junction, WV Member No.: 15,144 Region Association: MidAtlantic Region |
[quote name='bdstone914' date='Jun 29 2017, 11:51 PM' post='2501617']
Makes me wonder if a spacer between the caliper and the attachment point could be used to center it? This would retain the rotors "centering ability", no? [/quote] No. Rotors do not center themselves. The caliper can be spaced to center on the rotor if needed. You need the spacer between the caliper halves to allow the caliper to go around the rotor the thicker rotor. The caliper is in the correct position. What is the use of the car that makes you think vented rears are needed? Doing a lot of repeated high speed braking? Or is this just something you want to do ? Does not hurt anything other then adding more unsprung weight in the rear. Or is this just something you want to do? Yes a 69-73 911 rear rotor thatare 20mm thick will work. What calipers and rotors are on the front ? Or is this just something you want to do ? [/quote] 911 SC calipers and rotors on the front. On the advice of a local and well known mechanic that services alot of cars that use Summit Point Raceway it was suggested as an upgrade where repeated high speed braking will occur, not to mention the extra 250lbs I'm lugging around (sbc). Good data the spacers (already using caliper spacers on the front of course) and the rotor years. Ty |
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