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auxilary

Help! What brake options are available for S30 Z cars?

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nm. i couldnt find it as a seperate sale on ross's site. auxilary u wrote 86-89 4x4 or 4runner caliper are required. but jmortensen in ur FAQ it says 89-95 4wd pickup or 89-91 4 Runner .... r they the same as long as they have the S12/S12w stamped on the side regardless of the year?

I was checking parts on partsamerica.com, and for 89 4runner is an s12w. for the 92 4runner it shows s13wb:

 

191600.jpg

 

this is the caliper shown for the 89 4runner v6:

 

191240.jpg

 

you can see the backwards stamped s12 on it (they mirrored the images, I guess).

 

jmortensen is correct, up until 91 4runner, the brakes were s12 series. in 92 they switched over to the s13wb. The 94 toyota pickup shows teh same s12 calipers

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I use the '82-'83 200SX rear caliper on my conversions. It bolts up to the Maxima bracket. The stock S30 ebrake cable connects to it and it comes out at a much better angle. Pad area is same as the '82-'83 280ZX calipers.

 

 

did u use82-83 200sx calipers over the 280zx rotors?

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did u use82-83 200sx calipers over the 280zx rotors?

 

Great effort Auxiliary! Kudo's to you for the work you did.

 

This started as a great thread, some of the ensuing short versed quick back/forth discussion has created some confusion perhaps. I believe Steve was referring to the 200SX calipers having improved ebrake angle vs. the 280ZX rear calipers. He was not IMO referring to our 240SX rear setup which has fine ebrake geometry as pictured here, no sharp ebrake angles whatsoever.

 

ebrakehookedup.jpg

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I was checking parts on partsamerica.com' date=' and for 89 4runner is an s12w. for the 92 4runner it shows s13wb:

 

 

 

this is the caliper shown for the 89 4runner v6:

 

 

 

you can see the backwards stamped s12 on it (they mirrored the images, I guess).

 

jmortensen is correct, up until 91 4runner, the brakes were s12 series. in 92 they switched over to the s13wb. The 94 toyota pickup shows teh same s12 calipers[/quote']

 

so either one works? is there an advantage/disadvantage to either?

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did u use82-83 200sx calipers over the 280zx rotors?

 

You can use either the 1982-83 280ZX rear rotor or the larger diameter 1984 300ZX rear rotor. However, to use 300ZX rear rotor you have to also use the caliper support part of the 1984-86 300ZX rear caliper with the ‘82-‘83 280ZX caliper and even then the diameter of the 300ZX rotor must be decreased slightly from 290mm to 284mm. This is still larger them the 1982-83 280ZX rear rotor.

 

The 300ZX caliper support piece is necesary because it positions the caliper further away from the hub centerline due to the larger diameter of the 300ZX rotor:

 

300zxbracket.jpg

 

The larger diameter of the 300ZX rotor increases brake torque and the using 300ZX caliper support piece increases the distance between the caliper and the axle. This is important if you are considering the CV axle swap.

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so either one works? is there an advantage/disadvantage to either?

 

newer models may be a bit lighter. I do not have proof to back this up, but perhaps someone else does?

 

The S13W caliper is designed for a thicker rotor (25mm) than the S12W (which uses a 22mm thick rotor). As a result, the S13W is wider and heavier than the S12W. The piston area is the same between the two, but the S13W has about 10% more brake pad area.

 

The S12W caliper works with the 1984-88 Z31 rotor and second generation Maxima (1985-89) rotor. Finding a four lug OEM rotor to use with the S13W caliper has been a challenge. I have used the Saab 9000 rotor but it has to be machined to fit the hub and it also has turned on a lathe to reduce its outside diameter so it will fit under the S13W caliper.

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I have 15 inch rims on my car and theres barely any room between my stock brake calipers and the rim. I want to do the swap with the stock rotors, will they fit or will it hit the rim? And the calipers are s12w from an 86-89 toyota 4x4 correct? Thanks, I really dont wanna mess up.

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I have 15 inch rims on my car and theres barely any room between my stock brake calipers and the rim. I want to do the swap with the stock rotors, will they fit or will it hit the rim? And the calipers are s12w from an 86-89 toyota 4x4 correct? Thanks, I really dont wanna mess up.

 

I ran the S12+8 calipers (w/stock solid rotors) under 14x7 wheels.

I had to add a 1/4" spacer between the hub and wheel for clearance.

Bolt on other than that.

 

I have a set of the S12+8 calipers listed in the forsale section.

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Q1: how thick does that hub spacer need to be, 0.5in?

NOTE1: will be used on a 1971 240z with z31 5-lug front hubs with vented rotors in addition to 4x4 s12w calipers. using 6061 flycut to thickness and abrasive water jetted for profile (google this machine.. it uses high pressure water to cut metal parts, rated to cut thru 6in steel (2D only). the secret is ruby/sapphire dust in the water.)

 

Q2: what to do about hubcentric ring issue? sizes (ID/OD)?

NOTE2: when you have the hub spacer in it blocks the rotor from reaching the surface on the hub that centers it, keeping it back by the "no centering" part. for this you need a ring spacer so that the rotor never becomes "eccentric" and jacks everything up. otherwise i noticed modern motorsports sells this type of ring in their 4x4 package. maybe ross can PM me a price on the hubcentric spacers?

 

 

ok some pics. these may also serve the purpose of helping others who are considering this mod to figure out how all this stuff goes together. its really not that hard once you get all the parts together.

 

hubspacer.jpghub.jpghubgap.jpg

if not then:

http://siick.150m.com/pics/random/hubspacer.jpg

http://siick.150m.com/pics/random/hub.jpg

http://siick.150m.com/pics/random/hubgap.jpg

hubspacer.jpg

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...Q2: what to do about hubcentric ring issue? sizes (ID/OD)?

NOTE2: when you have the hub spacer in it blocks the rotor from reaching the surface on the hub that centers it' date=' keeping it back by the "no centering" part. for this you need a ring spacer so that the rotor never becomes "eccentric" and jacks everything up.... [/quote']

 

Here’s the rotor spacer I designed for the 240Z hub. It features a lip that centers the rotor. This makes it more difficult to make but other spacers I have seen just use the mounting bolts for rotor centering which is not good engineering practice:

 

http://home.earthlink.net/~zcarfan/sitebuildercontent/sitebuilderpictures/spacer.jpg

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Guest JAMIE T

Nice part! Though I don't need anything like that, it's cool you posted it.

 

It's funny how this "Brake options" thread became the "Toyota Brake upgrade FAQ". Lots of great information on the solid and vented toyota upgrade. Good job gang!

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haha nice drawing steve. i was trying to stay away from the one piece solution to cut down on fab time and material cost. im pretty sure id get jacked trying to make a part that detailed since the first thing they said in my machine shop class was "guys, no car parts." :/ i guess im going to have to think about this some more, and either find a more ghetto solution or buy the MM spacers. i just dont want that damn gap, like you said "not good engineering practice." thanks for not being all proprietary with part dimensions.

 

oh yeah one more thing. is your spacer for a 240z hub or a NA z31 hub on a 240z spindle? i still have the issue of Q1. i think i read on the forums that for my setup id need a 0.5in spacer, but i cant seem to find it again or confirm. just asking because i notice your drawing shows 0.663in thick.

 

thanks,

john

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FYI. . .

 

I mounted my S12W calipers (using the stock mounting tabs) and they fit under two of three sets of my 14x7" wheels (using a 1/4" spacer (from pepboys) between the hub and wheel).

There is only a small amount of clearance though.

 

I could not get access to the thrid set.

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http://www.zcarparts.com/store/merchant.mvc?Screen=CTGY&Category_Code=PBC06

 

If i use these rotors I will need to use the s 12 8 calipers from the 85-89 toyota 4x4 and a spacer correct? And were is the best place to get the spacer? If I am wrong please tell me what I need.

Thanks

 

Using the S12+8 Toyota 4x4 calipers with stock (solid / non-vented) rotors is bolt-on!

No spacer is needed between the hub and the rotor.

However' date=' you might need a spacer between the wheel and the hub.[/b']

 

I used a (off the shelf) 1/4" spacer from a local parts house to space the wheel out for caliper clearance.

You will need longer front wheel studs if you have to use a spacer.

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... is your spacer for a 240z hub or a NA z31 hub on a 240z spindle?... i think i read on the forums that for my setup id need a 0.5in spacer, but i cant seem to find it again or confirm. just asking because i notice your drawing shows 0.663in thick....

 

My rotor spacer is designed for the 240Z hub and the 1984 Z31 front vented rotor. The dimensions on the drawing are correct as I have installed these spacers on at least a dozen S30's.

 

If you want to use the 260/280Z hub the rotor spacer can be thinner. I think the difference is 8mm but I am quoting from memory. I need to re-measure my spare hubs to verify.

 

... i was trying to stay away from the one piece solution to cut down on fab time and material cost.... i guess im going to have to think about this some more, and either find a more ghetto solution...

 

If you want a cheaper solution then I recommend using the 1985-88 Maxima front rotor with the 280ZX hubs. The Maxima rotor must be machined to fit the ZX hub but this only costs [me] about $25 a rotor. You need to increase the ID of the center opening on the Maxima rotor and drill four holes for the rotor-to-hub mounting bolts. No spacer is needed! The ZX hub fits on the S30 spindle provided you remove the sheet metal backing plate from the strut:

 

brake_upgrade3.jpg

 

Sorry about the poor quality photo. It’s all I could find right now.

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