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Old 08-22-2018, 10:07 PM   #1
dirtbag240
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Default R brakes behind 15s

Hey all

Has anyone run the R front brakes sucsesfully behind 15×7 et 20 rims with adequate spacers??

Just dont want to have to invest in a whole new set of rims
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Old 08-22-2018, 10:11 PM   #2
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Why would you use spacers when you have the offset correct?
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Old 08-22-2018, 10:20 PM   #3
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R brakes have a 13" rotor + the caliper, so no
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Old 08-22-2018, 10:45 PM   #4
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R Brakes require at the minimun a 17" wheel, even then ceritan types will not fit.
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Old 08-23-2018, 12:29 AM   #5
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Originally Posted by thelostartof View Post
R Brakes require at the minimun a 17" wheel, even then ceritan types will not fit.
this

they are FUKin huge
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Old 08-23-2018, 07:59 AM   #6
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You already have F1 brakes, why **** with it?
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Old 08-23-2018, 08:24 AM   #7
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You already have F1 brakes, why **** with it?
What are F1 brakes? Are those the factory brakes on the 240?
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Old 08-23-2018, 08:51 AM   #8
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"F1 brakes" - just a little humor Matt from VB, since the OP got I.D. and O.D. confused.
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Old 08-23-2018, 09:45 AM   #9
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Just throw on some 5” spacers and rock out
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Old 08-23-2018, 09:47 AM   #10
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RX7 calipers "should" work in a 15" wheel with a 740 rotor. It'll be close but it might work. But yeah you can forget the R brakes.
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Old 08-23-2018, 10:19 AM   #11
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Donk it.
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Old 08-23-2018, 12:56 PM   #12
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What are F1 brakes? Are those the factory brakes on the 240?
There was a thread bashing sliding calipers, saying the 240 4 piston calipers were the same design as Formula 1 brakes, much hilarity ensued, but you had to be there. I've never had a probIem with overheating the stock brakes at autocross or single lap time trial events. Just get good pads and change the brake fluid with some high temp stuff and you shouldn't need to upgrade but that's just my opinion.
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Old 09-01-2018, 02:23 AM   #13
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Here's a front R caliper inside a 17" wheel. Not much room to go smaller. Maybe a nice thin forged 16 would clear, maybe.

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Old 09-01-2018, 12:40 PM   #14
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Lloyd what is disc diameter on those?
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Old 09-01-2018, 01:01 PM   #15
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To the original poster. Have you tried performance brake pads? Like EBC green or Hawk HPS for example? Have you ever used slotted or drilled rotors? Plus if you want long lasting rotors with sport brake pads you can buy rotors that are cryo hardened.

I like the R brake upgrade but it's not needed for a large increase in brake performance.
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Old 09-01-2018, 01:47 PM   #16
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Quote:
Originally Posted by stick70 View Post
RX7 calipers "should" work in a 15" wheel with a 740 rotor. It'll be close but it might work. But yeah you can forget the R brakes.
There's a few that do - Aries I know clear (and I carry an old tire on one in my RX7-caliper-equipped '80 as its spare), Scorpius-X, Draco, and 140 steelies do not.
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Originally Posted by AndrewNance View Post
Just throw on some 5” spacers and rock out
Going off my ATS calipers, I think 2" of spacer would get the mounting surface flush with the caliper face, then another 1.5" would push a 5" 140 wheel (I've got about 12 of 'em sitting in my shed, lulz) out far enough for the barrel to sit outside the caliper. Then, something like a set of stretched bicycle tires and an ABS conversion to keep the R brakes from constantly overwhelming their ability to grip would be perfect to complete the lunacy ;)

One thing I've learned over the years of banging on cars - do it once, do it right. You'll be better off keeping the R-brakes in a box, saving up for and looking for deals to do it right, rather than doing wacky workarounds to deploy them half-baked.
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Old 09-01-2018, 02:18 PM   #17
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My friends 93 940 wagon had the big brakes on it stock. The car came with Aries on it. When we tried my Virgos they won't work on there. But Borbet Type E in 15 x 7 fit on there and look great. So they should also clear the RX7 brakes.
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Old 09-01-2018, 07:26 PM   #18
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Quote:
Originally Posted by wujek View Post
Lloyd what is disc diameter on those?
13” s60R rotors
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Old 09-02-2018, 02:03 AM   #19
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13” s60R rotors
Correct.
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Old 09-02-2018, 02:44 AM   #20
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Donk it.
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Old 09-05-2018, 02:21 PM   #21
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put that bitch ooonn duuubs
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Old 09-05-2018, 02:35 PM   #22
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Quote:
Originally Posted by VB242 View Post
...I've never had a probIem with overheating the stock brakes at autocross or single lap time trial events. Just get good pads and change the brake fluid with some high temp stuff and you shouldn't need to upgrade but that's just my opinion.
This.

R brakes are cool, the system on these cars aren't garbage by any means. Just upgrade to a good sport pad and rotor combo and change out your high quality brake fluid every couple years. Save the time and effort and put it into just a brake job with better parts.
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