Looking for some brake Tech.

[Blase]

Flame suit on.....I searched and can't find the exact answers I'm looking for. Google, here and the old place.

Anyone know what the piston size(s) and mounting hole width are on 1979-1985 Toyota front brake calipers? The ones for non-vented rotors. Sounds like they have two different size pistons on each side but I can't ever find what size they are. At a glance they seem like MAYBE they are a poor mans junk yard version of Wilwood Dynalite Calipers with 4 1.75" pistons.

Building 609 axles using 99-04 outers. I have and plan to run Spider Trax 14" rotors (already have them). While I would LOVE to run Wilwood Dynalite calipers and pads they are a big hit to the budget. Right at $1K for Wilwood stuff and while the Toyota stuff is $400. I can make everything I need to run either.

Slow technical rock crawling only. light weigh buggy (3Kish) ! off road only. 39" -43" tires. 22re/auto/doubler.

I'd rather KNOW what the bore size is and that they will not work before I spend $$$ for Wilwood.

 

[Grendel]

Why not cheap Brembo's from an OEM application?

CTSV's can be had cheap with all parts available for years to come.

 

[tsomctl]

More Information for NUGEON 9701512A

One piston is 1.34 in, other is 1.69

 

[Blase]

Why not cheap Brembo's from an OEM application?

CTSV's can be had cheap with all parts available for years to come.

can CTSV calipers be used with ST 14" rotors? Without looking I would assume that CTSV's had vented rotors which are wider than the 1/2 ST that I would like to run.

More Information for NUGEON 9701512A

One piston is 1.34 in, other is 1.69

Perfect! Thank you very much!

 

[Grendel]

can CTSV calipers be used with ST 14" rotors? Without looking I would assume that CTSV's had vented rotors which are wider than the 1/2 ST that I would like to run.

Perfect! Thank you very much!

Front Brake Rotor:

Rotor Minimum Thickness*
28.5 mm
1.122 in

 

[Ghetto Fab.]

I might have a set sitting at home if I can remember to measure them.

 

[ScottRS]

The caliper half assembly bolts will be an interference problem with 14" rotors too. You can grind the casting to bolt contact but the center/edge of the pad at the outside will hang off just a little. If you don't care, go ahead.
I run the later Toyota truck/4runner vented-rotor calipers on 13.75" Ford rotors and have a little hang-off after grinding the caliper castings at the edges.

 

[Bebop]

I have and plan to run Spider Trax 14" rotors (already have them).

Thin rotors?

 

[ScottRS]

Pad hang-off with the bolts as close as I feel safe getting them to the rotor OD.

 

[ScottRS]

Mounting hole width is 3.5" on center on the vented rotor variant, should be the same as the solid rotor variant.

 

[ScottRS]

On a related-ish note, if you want to do this, I'd suggest getting late 80s to early 90s calipers (vented rotor years) instead, and use an old pad or two with the friction material removed as a shim to take up the rotor width difference. It'll let you use larger piston bore size calipers and more populous-in-junkyard calipers. There are several bore sizes over the years/options, V6 4runners got bigger pistons than 4cyl pickups. Some of the later V6 4runners also got thicker vented rotors, but otherwise everything is pretty similar.

 

[Blase]

The caliper half assembly bolts will be an interference problem with 14" rotors too. You can grind the casting to bolt contact but the center/edge of the pad at the outside will hang off just a little. If you don't care, go ahead.
I run the later Toyota truck/4runner vented-rotor calipers on 13.75" Ford rotors and have a little hang-off after grinding the caliper castings at the edges.

Scott I don't follow exactly what you are saying here other than I'll have issues running the Toyota non-vented calipers with the ST thin 14" rotors correcct?

Thin rotors?

yes sir. 14" and I think they are 1/2" think IIRC. been a while since I put them on the shelf.

Pad hang-off with the bolts as close as I feel safe getting them to the rotor OD.

Yours talking about the pads sticking up above the rotor being the issue correct?

Mounting hole width is 3.5" on center on the vented rotor variant, should be the same as the solid rotor variant.

Thank you!

I may have found a deal on a new never used Busted Kunkle brake kit for 99-04 axles. 4 Wilwood calipers and pads with hardware and brackets. Its just missing the rotors. I'm looking now to see if I could remove the spacers from the Wilwood calipers so they work with the thin Rotors. From what i've read I can. So if works out that is most likely how i'll go.

 

[ScottRS]

Scott I don't follow exactly what you are saying here other than I'll have issues running the Toyota non-vented calipers with the ST thin 14" rotors correcct?

yes sir. 14" and I think they are 1/2" think IIRC. been a while since I put them on the shelf.

Yours talking about the pads sticking up above the rotor being the issue correct?

Thank you!

I may have found a deal on a new never used Busted Kunkle brake kit for 99-04 axles. 4 Wilwood calipers and pads with hardware and brackets. Its just missing the rotors. I'm looking now to see if I could remove the spacers from the Wilwood calipers so they work with the thin Rotors. From what i've read I can. So if works out that is most likely how i'll go.

Sorry, posting from phone, easier to post a thought and then follow it up with a pic in a separate post. The pic I posted of the pads not really sitting on the rotor properly, is my front axle. It's not a major issue, but is not quite right.

The spidertrax rotors are 3/8" IIRC but don't quote me as that being the gospel truth. The 14" diameter vs the caliper half bolts is the issue, a 12-12.5" rotor will sit inside there but larger and you get what I have. The wilwood calipers are designed for the larger rotor size so they have more room near the edges.

In defense of the Toyota calipers, being iron, they flex less under pressure than aluminum, and IIRC, some of the wilwood aluminum calipers aren't rated for use with power brake boosters. Not sure if that's a concern for you but if it is, ask the question before sinking the cash.

 

[Blase]

Thanks for the reply Scott. makes total sense now. No plans to run any power booster at this time. Plan is to run a single Wliwood master with a 9:1 (ish) pedal.

I had considered making a spacer to run the later model calipers on the thin rotor but wasn't sure that was the best idea. Sounds like that's not an issue so that may be the way to go since I can find a caliper made for a larger Dia rotor and just space the pads in.