Rear Disc Brake, SA to IFS rotor swap? Stupid? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 02-04-2020, 06:27 PM   #1 (permalink)
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Rear Disc Brake, SA to IFS rotor swap? Stupid?

So I've got a Toyota 9.5" hybrid rear axle, semi-float stock style with something or other 'upgraded shafts. Previous owner had done a solid axle, solid rotor swap with matching calipers, mounts welded onto the axle housing.

Due to some failed wheel studs, the rotors are oblonged and trash.

I do happen to have some Tacoma IFS rotors and calipers that i'm not using for anything. appear to be reasonably close in overall height.

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is there any reason that anybody can think of for why I SHOULDN'T just turn down the OD of the axle shaft to accept the Tacoma rotors?

it seems to be the most free option at the moment.
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Old 02-04-2020, 06:29 PM   #2 (permalink)
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picture of hole that should be 14mm but isn't
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Old 02-04-2020, 10:24 PM   #3 (permalink)
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I'd run it. Let me know if you need to throw them on the lathe dude!
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Old 02-05-2020, 10:31 AM   #4 (permalink)
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I'd run it. Let me know if you need to throw them on the lathe dude!
good enough for me!

took about 0.350" off the OD, ended up about 6.650" diameter, clears without issue. put a small chamfer on the inside corner for gime, probably about 0.075" at 45* and face about .010" off the face to clean up all the mushroomed hats.

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Old 02-06-2020, 02:43 PM   #5 (permalink)
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Dorman (610-312.1) 'M12-1.50' and 44.5mm Long Serrated Wheel Stud

tagging for tonight

https://www.amazon.com/Dorman-610-31...omotive&sr=1-1

main page claims 14.17mm knurl (0.557") and part specific part shows 14.3mm (0.562") so i'll check how many I actually need, order them and then drill for .005-.015" interference fit if needed

35/64" drill bit is 0.5469

14.00 drill is 0.5512

14.25 is 0.5610

9/16 is 0.5625
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Old 02-06-2020, 03:00 PM   #6 (permalink)
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is there any reason that anybody can think of for why I SHOULDN'T just turn down the OD of the axle shaft to accept the Tacoma rotors?

it seems to be the most free option at the moment.
besides on the trail replacement shaft needing to be turned down to fit and the fact you can get new replacement SA rotors for 17$, nope do it up
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Old 02-06-2020, 03:03 PM   #7 (permalink)
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besides on the trail replacement shaft needing to be turned down to fit and the fact you can get new replacement SA rotors for 17$, nope do it up
see that's what I though too, but sumbitch they were all $35+ for those rotors

but really, when is the last time you broke a rear shaft? It's like a front diff, there are other things that fail first

this was I'll have slip on rotors, so there is that
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Old 02-06-2020, 03:08 PM   #8 (permalink)
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ive broken everything, multiple times, but never a rear shaft. i have a buddy thats broken a stock rear toy shaft and a TG chromo rear shaft and a 14b rear shaft though



rockauto has em for 17$
https://www.rockauto.com/en/catalog/...hub,rotor,1896
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Old 02-06-2020, 03:24 PM   #9 (permalink)
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well, i'll cut up a stock rear shaft to have a spare then that i'll never need and leave in the trailer. that will guarantee i'll never need it
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Old 02-06-2020, 03:32 PM   #10 (permalink)
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well, i'll cut up a stock rear shaft to have a spare then that i'll never need and leave in the trailer. that will guarantee i'll never need it
we left one in the bushes on fordyce
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Old 02-06-2020, 05:12 PM   #11 (permalink)
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we left one in the bushes on fordyce
sounds about right
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Old 02-07-2020, 11:40 AM   #12 (permalink)
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I have broke two rear axles, one stock and a Poly Performance alloy wich I broke in two places!!
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Old 02-07-2020, 12:40 PM   #13 (permalink)
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I have broke two rear axles, one stock and a Poly Performance alloy wich I broke in two places!!
Alright 2 shafts in 40 years of 4wheeling a 90's Toyota is pretty good success rate


edit (in case anybody doesn't know, OOPS has been wheeling Toyotas longer than Toyota has been making them )

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Old 02-07-2020, 12:43 PM   #14 (permalink)
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every single rear shaft ive seen break was done crawling super slow so it makes sense old dude puttin around in double low all day has broken two
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Old 02-08-2020, 06:14 PM   #15 (permalink)
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alright, some install pictures in case anybody is ever dumb enough to do this in the future, but is hesitant because there are no pictures

shaft post turning, lots of meat left there

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studs that orielly had in stock, 1995 Toyota 4runner front studs

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studs pressed in without issue

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and everything all together using the pre-existing caliper mount. no real issues, though it seems like grinding a touch off the caliper ears would help. previous solid axle calipers had about a .090" shim (or so, I didn't measure or look closely)

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the SA calipers were mounted about 1/16" too high, the IFS calipers using the same mounts are about 1/8" too high. I'm not sure that I will change the mounts....but maybe

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certainly good enough for moving it in and out of the garage for a bit
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Old 02-08-2020, 06:32 PM   #16 (permalink)
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I'm not sure that I will change the mounts
you wont

prove me wrong
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Old 02-08-2020, 06:38 PM   #17 (permalink)
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you wont

prove me wrong


It is really, really close to being right. I've seen factory pads wore worse


so while I was (briefly) think about this as I was putting the tires on, I was thinking that if I end up having problems, I might just make a sleeve for it and then I could just mount it on a pin instead of clamping it with a bolt. it would techinically be floating then

also something I will likely never do :blkflipodd2:

Last edited by Provience; 02-08-2020 at 06:39 PM.
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Old 02-08-2020, 06:46 PM   #18 (permalink)
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i wouldnt move them
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Old 02-08-2020, 06:57 PM   #19 (permalink)
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i wouldnt move them
i'll be happy to remember to put nuts on the bolts at this point
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Old 02-08-2020, 07:12 PM   #20 (permalink)
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Worst case just strap the caliper to the frame and limp out. Rear brakes are over rated on a crawler
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Old 02-08-2020, 07:16 PM   #21 (permalink)
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Worst case just strap the caliper to the frame and limp out. Rear brakes are over rated on a crawler
crawler? I'mma have 4 wheel vented disc brakes. #RACECAR

a big reason I prefer hard line over SSbraided brake line everywhere? Hard line is easy to crimp off when you need to isolate a wheel
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Old 02-08-2020, 07:53 PM   #22 (permalink)
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I ran that setup many years ago and never liked it.
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Old 02-08-2020, 07:53 PM   #23 (permalink)
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crawler? I'mma have 4 wheel vented disc brakes. #RACECAR

a big reason I prefer hard line over SSbraided brake line everywhere? Hard line is easy to crimp off when you need to isolate a wheel
I used to carry a male and female plug. Made from spare brake lines. That way I wouldn't have to ruin a whole line on the rig.

I also used those an style soft lines with adapters on each end so even with domestic axles on a jap rig, I could carry one spare, or Rob the rear for a front.

Edit: wait, are you running fixed calipers on a semi float rear? I thought that was pretty much considered a bad idea?

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Old 02-08-2020, 08:11 PM   #24 (permalink)
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I ran that setup many years ago and never liked it.
why?
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Old 02-08-2020, 08:13 PM   #25 (permalink)
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why?
I've read on here that the slight amount of play the semi float bearing has will push the pads in a small amount and make for a soft pedal.
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