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Brakes on the Toyota 8" axle: my nemesis.

Posted by Gravity Fed 
Gravity Fed
Alex Staidle
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1978 Mazda Rx7



Brakes on the Toyota 8" axle: my nemesis.
June 15, 2016 06:20PM
So here is what I have. Toyota 4runner axle. An 8" and as I now regret, ABS equipped one. Machined the axles to fit a saab 900 rotor in 4x4.5.

Caliper wise, i tried fitting volvo 240 rears but the bottom inlet for hydraulics kinda sucks for clearance. I then acquired a bracket that mounts Toyota calipers but the saab rotor is 280mm and the toyota is ~300 so the rotor i have is too small, but the alignment is perfect.

I hate this car.









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Gravity Fed
Alex Staidle
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Re: Brakes on the Toyota 8" axle: my nemesis.
June 15, 2016 06:21PM
the fancy brakcets looks like this








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Edited 1 time(s). Last edit at 06/15/2016 07:17PM by Gravity Fed.
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Gravity Fed
Alex Staidle
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1978 Mazda Rx7



Re: Brakes on the Toyota 8" axle: my nemesis.
June 15, 2016 06:23PM
I think my ideal solution at this point is to have a rotor hat with the right offset to match the saab rotor, then bolt up a solid disc to the toyota diameter.

Since i lack machining ability or for that matter access, and anything I've tried to make its off plane to the mounting surface, making a bracket seems to be beyond my ability. I've tried. It didn't go well.



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Gravity Fed
Alex Staidle
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Re: Brakes on the Toyota 8" axle: my nemesis.
June 15, 2016 06:28PM
so this hat from wilwood might work after machining to fit my lug pattern... (its a blank)


Rotor Bolt Circle: 8 x 7.62 Hat Offset: 2
model # 171-2233







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Pete
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Re: Brakes on the Toyota 8" axle: my nemesis.
June 15, 2016 08:00PM
You're going to hate me for this. I wanted to use a Volvo S40 rotor because they are light, cheap, can be shared with one of my other cars, and was guaranteed to work with VW calipers because the car used the same manufacturer. But the VW calipers (A4-chassis cars - Golf/Jetta/New Beetle/front-drive TT) will sort-of mate up to Mazda E-brake and are also aluminum.

I found out by accident that Wilwood (Superlite?) brackets have the same 3.5" bolt spacing as the VW units. And it shocked me to learn that the combination of Volvo-Mitsubishi brake rotor, VW caliper, and circle track bracket fit exactly the right depth if I was willing to run a 1"+ caliper spacer.

I'm not, so i just did this:



Drilled through and now the brackets are belt and suspenders welded and through-bolted. Can't use standard 1" long 1/2-20 T-bolts due to the added thickness, but that is what angle crinders and longer bolts are for. Now I just gotta get some 1.25" diameter bar so I can weld the ends onto the rearend. But DAMN anything precise enough is super, super expensive...



Pete Remner
Cleveland, Ohio

1984 RX-7 (rallycross thing)
1978
Silence is golden, but duct tape is silver.



Edited 1 time(s). Last edit at 06/15/2016 08:04PM by Pete.
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john vanlandingham
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Re: Brakes on the Toyota 8" axle: my nemesis.
June 15, 2016 08:15PM
Pete; Numbers PN Model diameters more piccies.. MORE INFO.. Your set up is nice and simple.. Alex has zero capability to machine anything...Don't even know if he has a drill press...And in California its like $100-150 for even facing off 4 spacers.

And VW as far as i know are 90mm c-c.....3.5" is 88,9mm
Close.



John Vanlandingham
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Pete
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Re: Brakes on the Toyota 8" axle: my nemesis.
June 15, 2016 09:03PM
Close, and the Wilwood caliper hangers are threaded something like 7/16-14, the 10mmx1.5 throughbolts to hang the VW calipers are a slightly loosey-goosey fit.

I don't think throwing part numbers and stuff around would help. When I had my axles made, I told the guy that the only hard dimensions I had were 59" flange-flange width (+1 over RX-7) and 1" driveshaft offset to left, I didn't make a housing yet and I didnt make the brake setup yet so make the axle flange to bearing flange distance "whatever" and I'd figure it out from there. And the Volvo rotors have a HUGE center hole, I had my boss whip up a pair of locators/spacer things of the right ID, right OD, and right thickness.

So basically I decided to use certain parts because they were common/cheap/suitable without any concern for fitment, and somehow magically everything worked. This happens exactly never, probability of infinity minus one to one.

All the piccies are on my tablet, which can't connect to Photobucket without getting a malware-gasm.



Pete Remner
Cleveland, Ohio

1984 RX-7 (rallycross thing)
1978
Silence is golden, but duct tape is silver.



Edited 2 time(s). Last edit at 06/15/2016 09:06PM by Pete.
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Gravity Fed
Alex Staidle
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Re: Brakes on the Toyota 8" axle: my nemesis.
June 15, 2016 10:18PM
there is also an 8 x 7 hat that is 1.96 inches. more rotors in that sizing.



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john vanlandingham
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Re: Brakes on the Toyota 8" axle: my nemesis.
June 15, 2016 11:46PM
Quote
Pete
Close, and the Wilwood caliper hangers are threaded something like 7/16-14, the 10mmx1.5 throughbolts to hang the VW calipers are a slightly loosey-goosey fit.

I don't think throwing part numbers and stuff around would help. When I had my axles made, I told the guy that the only hard dimensions I had were 59" flange-flange width (+1 over RX-7) and 1" driveshaft offset to left, I didn't make a housing yet and I didnt make the brake setup yet so make the axle flange to bearing flange distance "whatever" and I'd figure it out from there. And the Volvo rotors have a HUGE center hole, I had my boss whip up a pair of locators/spacer things of the right ID, right OD, and right thickness.

So basically I decided to use certain parts because they were common/cheap/suitable without any concern for fitment, and somehow magically everything worked. This happens exactly never, probability of infinity minus one to one.

All the piccies are on my tablet, which can't connect to Photobucket without getting a malware-gasm.

Oh OK...I'm trying to get him to understand we choose easy to find stuff as close to corrct as possible for the wear parts..Discs and calipers are wear parts....adaptor mount, bolt-on or zap on aren't wear parts..So we make effort in the weird diddly thing so that the consumables are "open the box and stand back and frisbee them on"
Alex has said there's some "thing" for the ABS sensor on the axle he has..much discussion and i can't get clear idea.. I said kill it with fire..or a grinder...
As for a big center hole the gawddam Saab 99/900 rear rotor (and front up to '74--yeah same disc front and rear from '69 to 74) has a GIGANTOR hole in the middle and a fairly deep hat..Toiletta Sumitomo and Superlite Willwood clear and are below the hat surface....
I'm thinking 90/900 disc, and Volvo 240 caliper, mount it up and see where things sit relative to fixed junk and make as simple a mount as possible: flat main plate and spacers to in-out distance.



John Vanlandingham
Sleezattle, WA, USA

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www.rallyrace.net/jvab
CALL +1 206 431-9696
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Gravity Fed
Alex Staidle
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Re: Brakes on the Toyota 8" axle: my nemesis.
June 16, 2016 12:25AM
Is the hole on the bottom in the 240 caliper typical? See above photo



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Eric Ewert
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Re: Brakes on the Toyota 8" axle: my nemesis.
June 16, 2016 07:53AM
Quote
Gravity Fed
Is the hole on the bottom in the 240 caliper typical? See above photo

As far as I know yes. I made 240 calipers work on my car. The hole/brake line clearance is a little snug but it works without issue. I am using volvo 240 rear rotors so if you are using something of smaller diameter then yes it may pose a clearance issue.

If you want I can send you pics of my bracket setup if your willing to wait a few days.
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john vanlandingham
John Vanlandingham
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Re: Brakes on the Toyota 8" axle: my nemesis.
June 16, 2016 10:26AM
Quote
Eric Ewert
Quote
Gravity Fed
Is the hole on the bottom in the 240 caliper typical? See above photo

As far as I know yes. I made 240 calipers work on my car. The hole/brake line clearance is a little snug but it works without issue. I am using volvo 240 rear rotors so if you are using something of smaller diameter then yes it may pose a clearance issue.

If you want I can send you pics of my bracket setup if your willing to wait a few days.

A FEW DAYS!!!! holy mother of christ on a cross we need it now!!!!! Just snap a shot with your phone and click it thru here. HI REZ!
And answer the phone!



John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.
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Pete
Pete Remner
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Re: Brakes on the Toyota 8" axle: my nemesis.
June 16, 2016 11:42AM
10-4 on making consumables replaceable. And common. Don't want any parts to be 3-4 days out from from specialty shop.

Part of the reason why I chose the axle lengths I did is that I can use a 60" width centered-pinion axle on one side, 58" centered-pinion on the other, both very very common circle-track bits. Then I had to go and run a goofy bolt pattern just so I could keep using all the bazillion wheels I have...



Pete Remner
Cleveland, Ohio

1984 RX-7 (rallycross thing)
1978
Silence is golden, but duct tape is silver.
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Gravity Fed
Alex Staidle
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Join Date: 08/21/2009
Posts: 1,676

Rally Car:
1978 Mazda Rx7



Re: Brakes on the Toyota 8" axle: my nemesis.
June 16, 2016 11:55AM
Well the toyota caliper can be used with only a minor change (tapping a hole). The rest is off the shelf enough for me.



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Pete
Pete Remner
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Re: Brakes on the Toyota 8" axle: my nemesis.
June 16, 2016 03:25PM
Any chance you can re-clock the four bracket to axle holes so the mount is parallel to one pair, so you can make the caliper sub-bracket sit closer diametrically?



Pete Remner
Cleveland, Ohio

1984 RX-7 (rallycross thing)
1978
Silence is golden, but duct tape is silver.
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