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Thread: Rear Disc Brake, SA to IFS rotor swap? Stupid? Reply to Thread
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Topic Review (Newest First)
02-20-2020 06:17 PM
Provience
Quote:
Originally Posted by YotaAtieToo View Post
I think he is thinking about just opening up the pilot hole on the rotor. Not turning the id of the hat.

I'm not a fan of custom wear parts.
oh I see, yeah the chevy hub is smaller so it needs to be opened up to use the Toyota axle in it

i'm not sure if an aftermarket rear shaft can outlast a rear rotor, but I guess we'll find out eventually.
02-20-2020 06:11 PM
YotaAtieToo I think he is thinking about just opening up the pilot hole on the rotor. Not turning the id of the hat.

I'm not a fan of custom wear parts.
02-20-2020 05:46 PM
Provience
Quote:
Originally Posted by OregonYO View Post
May I ask why you didnt lathe the inside of the rotor? Instead of the shaft. Thats what everyone does to the GM rotors to make them fit.
Did you guys with the soft pedal ever run the big GM master cylinder? Seems to help some.
Im a, tap the pedal before you brake, kinda guy anyway.
I don't believe that there is enough material on the rotor to remove and have any sort of integrity, but I didn't look close. guess I can check on the next one.

2) shaft was easy to turn and test fit with the rotor, rather than test fitting the shaft into the rotor on the lathe = less stuff to measure

I have no desire to tap the brakes, i'm a mash pedal, attempt to control skid, release and drive around if required kind of person. maybe I've got enough master cylinder to make the takeup not an issue, if not then the caliper will get pins so they can float. but that is 'tomorrows' problem for now .
02-20-2020 06:56 AM
OregonYO May I ask why you didnt lathe the inside of the rotor? Instead of the shaft. Thats what everyone does to the GM rotors to make them fit.
Did you guys with the soft pedal ever run the big GM master cylinder? Seems to help some.
Im a, tap the pedal before you brake, kinda guy anyway.
02-11-2020 07:41 AM
smracing
Quote:
Originally Posted by YotaAtieToo View Post
You're running a caliper from a car that was never sold in the US?
Yes. I have all kinds of parts left over from my JDM owning days.
02-10-2020 08:18 PM
crash Ya I had the exact same scenario as dave and even tried residual valves with zero change.. On the street great...
02-10-2020 08:53 AM
Provience alright, well I guess i'll add "make pins" to list of things to do …… eventually

not interested in running a residual valve
02-10-2020 08:49 AM
YotaAtieToo You're running a caliper from a car that was never sold in the US?
02-10-2020 08:17 AM
smracing I run a semifloat with fixed calipers with no issues. Setup is 1992 FJ80 9.5" semi-float, 2003 Sequoia rear rotors, 1993 Nissan Skyline GTR rear calipers.
02-10-2020 08:04 AM
YotaAtieToo Isuzu has stock rear disc's with an ebrake, 6x5.5. Fwiw.
02-10-2020 07:52 AM
OOP'S When I did mine with SA calipers and rotors they worked fine on the street, in the rocks it was a different story. As soon as I hit the rocks and started flexing I would have to pump the brakes. There was just enough movement to open the calipers a bit requiring pumping. I tried both a 3 pound and a 10 pound residual valve's to no avail!! I ended up using a floating caliper from a Honda Passport, rotors from some Mitsubishi SUV with homemade brackets. They work great!!!
02-09-2020 08:05 PM
Aisin Install a 3 lb residual valve in the rear. Problem solved.
02-09-2020 01:26 PM
crash
Quote:
Originally Posted by rockyota83 View Post
why?
Quote:
Originally Posted by YotaAtieToo View Post
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.
Ya this-- If you didn't pump on the way up to a very steep obstacle and had to nail the brakes i found the pedal would almost go to the floor and close to not having 100% stopping force..

Swapped to floating calipers and never had an issue again.
02-08-2020 08:18 PM
Provience
Quote:
Originally Posted by crash View Post
I ran that setup many years ago and never liked it.
Quote:
Originally Posted by YotaAtieToo View Post

Edit: wait, are you running fixed calipers on a semi float rear? I thought that was pretty much considered a bad idea?
1) see crash's response above, it seems many people get issues that I would assume are related to the SF shaft moving in and out.

2) it had a fixed caliper on it before, jeaton claims he didn't have issues.

3) the Toyota rear isn't the same as some other SF axles. The bearing sits flush against a shoulder on the shaft, then there is a spacer, then the snap ring, and the housing is bolted solid. So in theory it shouldn't have much room to move.

4) I never had any complaints about my drum rears

if it does, then i'll just make up some sleeves so that the caliper can float #ShitllBuff
02-08-2020 08:13 PM
YotaAtieToo
Quote:
Originally Posted by rockyota83 View Post
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.
02-08-2020 08:11 PM
rockyota83
Quote:
Originally Posted by crash View Post
I ran that setup many years ago and never liked it.
why?
02-08-2020 07:53 PM
YotaAtieToo
Quote:
Originally Posted by Provience View Post
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?
02-08-2020 07:53 PM
crash I ran that setup many years ago and never liked it.
02-08-2020 07:16 PM
Provience
Quote:
Originally Posted by YotaAtieToo View Post
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
02-08-2020 07:12 PM
YotaAtieToo Worst case just strap the caliper to the frame and limp out. Rear brakes are over rated on a crawler
02-08-2020 06:57 PM
Provience
Quote:
Originally Posted by rockyota83 View Post
i wouldnt move them
i'll be happy to remember to put nuts on the bolts at this point
02-08-2020 06:46 PM
rockyota83 i wouldnt move them
02-08-2020 06:38 PM
Provience
Quote:
Originally Posted by rockyota83 View Post
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:
02-08-2020 06:32 PM
rockyota83
Quote:
Originally Posted by Provience View Post
I'm not sure that I will change the mounts
you wont

prove me wrong
02-08-2020 06:14 PM
Provience 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

Attachment 2963144

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

Attachment 2963146

studs pressed in without issue

Attachment 2963148

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)

Attachment 2963150

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

Attachment 2963152

certainly good enough for moving it in and out of the garage for a bit
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