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


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Like I said before, I would check that my rears weren't too tight, and I'd make sure I had no air in the front lines. After that suspicion moves to the proportioning valve. I don't believe there is any way to adjust it: it either works properly or it doesn't. I haven't had issues with mine so I can't give you advice from my own experience, but you could either replace it with another from a JY, or replace it with an adjustable unit. Given you've changed the braking power of the fronts, I think the adjustable would be a good idea anyway. That's the direction I'm headed.

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OK... Im unsure if im reading this right.

 

IM doing this upgrade on my hr30 skyline. Im using the 280z Hub/carreir and bolting that to the hr30 spline ( same as the 280z. R30's use a crappy Hub/rotor combined setup) Everything matches up the same as it would on the 280z. So this means i can use the maxima rotors ? with out needing a spacer ect?.

 

What od are the maxima rotors ? 250mm...260 ? ect ?

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Quote:

Originally Posted by nicedat

you need less effort to push two pistons than four, so this would give more power to the rear.

 

Not true: you need less VOLUME for 2 pistons vs. 4. For a given level of pressure, the 4 piston caliper with its greater piston area will exert MORE force on the pads/rotor than the 2 piston caliper.

 

Piston bore area (or piston area) is what is important. An you'll find very little difference between 1, 2, and 4 piston caliper effectiveness if all pistons have the same total area (except for the single or dual floating piston arrangements that must have their piston area multiplied by 2 in order to compare to "fixed" calipers).

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ok guys, What do i need to do. Im doing this upgrade my problem is, is trying to find the right rotor.

 

As i stated in the above post. Im using 1979 280z Front hub carriers. These are going onto my skyline as the main spline is the same. Same with all the mounting points. ect....

 

Im using the s12+8 Vented disk Calipers off a 1988 hilux/4runner Which really need the ofset of the rotor to be pushed back. MY problem is at the moment is when lineing the gear up on the rotor ( i marked out caliper mounting points to see where the rotor will sit in the caliper) I came accros that the caliper hits the center of the 280z hub. :( :(. Now im dumfounded.

 

Either way. it looks like i have 10mm extra clearance on the caliper in the Rotor O'd. With these maxima rotors what out diamiter are they ? Hat height ect ?

 

IM getting frustraited and confused also about this. Does this upgrade not apply to a 1979 280z ?

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There are different diameters for the Maxima front rotor. Several years ago I change my old ones out for newer model ones that were about 1/2" larger. The (and this is a guess at the current time) latest rotors I have on the car are 2000 year rotors, and they are roughly 11" in diameter (I could provide exact data later when I get back home).

 

Pictures are worth a thousand words, and would help us solve your problem.

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Ok... intresting. whats the possibilty of some pictures ? Mostly im requiring this to see what its like on a 79 280z. It could be a problem that im using the earlyer s12+8 calipers. Which are usually only used on the solid rotor. Since mine are the venter rotor version (20mm nomanal thickness) Does that change the whole subject for me ?

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Mine is a s130 luckly. Either way ive come accros another way to do this. 5x114 trailer hubs.. I can get them thru work cheep. Everything is the same dimensions on them bearing placement. The bearings are the same ect. just 5x114. So ill be modding them to fot the maxima rotor on the back face. :D

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  • 3 weeks later...
  • 1 month later...
  • 2 weeks later...
  • 1 month later...

anyone try grinding the caliper to make it fit? i put S12+8 calipers on my 240 - 280 hubs, JSK spacer. all fits well, but none of the wheels i own fit - '83 ZX non-turbo (six-spoke), Panasport 14", '81 ZXT snowflakes (15"). Snowflakes come closest, but vertical ridge on the outer face of the S12+8 seems to be the interference issue. Thoughts?

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  • 3 weeks later...
thats what i did and it works perfect. (grinding the caliper)

 

Any pictures of that?????

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You can also use a version of the S12+8 calipers for the vented rotor conversion.

 

Let me explain. There are two different Toyota 4x4 calipers with the casting mark "S12+8". One for a solid rotor and one for a vented (wider) rotor. The 1979-85 4x4 calipers are for use with a solid rotor but the 1986-88 4x4 calipers are also marked "S12+8" but they are designed to fit the wider, vented rotor.

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After searching the J/Y for brake parts I came up with this list.

 

S12+8 calipers donor list:

 

1- 86-88 4WD PICK-UP

2- 86-89 4Runner

3- 79-90 Landcruiser.

 

Hope it helps.

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  • 3 weeks later...

ok.. I just went to the JY yesterday... I went to the trouble to jack up half a dozen cars.. In the mud.. in the cold weather... You guys should thank me...

 

 

An overview... Top Left: late Maxima caliper. . . . Top Right: early Maxima caliper

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Bottom Left: 82 280ZX caliper. . . . Bottom right: 240SX caliper

Calipercomparison.jpg

 

 

 

 

Early '82 Maxima:

rear calipers

could not get rear brackets(welded on) and the wagon model had drum brakes

Caliper is the same as the late 280ZX but it has a smaller piston

 

 

 

 

 

 

Later '86 Maxima:

Rear calipers

Flat brackets

86Maximacaliper.jpg

 

86Maximahanger.jpg

 

 

 

 

 

 

240SX:

rear calipers

could not get brackets... they were welded like the early Maximas'

240SXcaliper.jpg

 

240SXhanger.jpg

 

 

 

 

 

 

 

280ZX:

rear calipers

Rotors

83280ZXcaliper.jpg

 

83280ZXhanger.jpg

 

 

 

 

 

300ZX:

rear brakes were already stripped

Probably the same as the Late Maxima calipers

 

 

 

200SX:

rear brakes were already stripped

???????????????????????????????

 

 

 

Some differences I noticed right off the bat are...

1. The mounting hangers have different offsets where they bolt to the bracket.

 

2. The E-brake hangars vary WIDELY!!!!

 

3. The piston sizes are different.

 

 

 

To mention some similarities...

1. The ZX and the Maximas appear to use the same caliper offset, distance from rotor, E-brake hangars, and radial spacing...

EXCEPT the Maximas have SMALLER pistons than the ZX models...

 

2. The pistons appear to come in 2 sizes...

A. The smaller pistons appear in: Maximas, 240SXs, I'll bet 200sx as well

B. The larger pistons appear ONLY in the ZX models...

 

 

I do not have the 300ZX calipers to compare... But I am willing to bet they are the same as the 85-88 Maxima calipers EXCEPT they have bigger pistons...

 

 

 

 

 

If you are wondering why all the research....

 

I realize that Ross at MM may have the best option available...

But I wanted to break this down for everyone who was wondering how the various options boil down....

 

1. Early 280ZX rear brakes:

The bottom of the line upgrade was always the EARLY 280ZX calipers and rotors...

The calipers are heavy, and interfere with some wheels

The rotors are small,

The pads are tiny.

 

 

 

2. Later 280ZX rear brakes:

This is a step up in performance with a few problems..

Large piston calipers

The rotors are small

The pads are the same as all the later model cars

The E-brake cable is a tight fit

This uses the early maxima offset bracket(bolt on)

 

 

 

3. 200SX rear calipers with 280ZX OR 300zx rotors

This was an interesting option giving some leverage for adjusting brake bias with rotor size... except we dont know some of the details yet... This option could equal the Ross/MM 240sx conversion in funtionality.. But to equal Ross's set up you would need to source 2 sets of calipers and you must have the outer DIA. of the large rotor reduced a fraciton of an inch...

The rotors are small but can be enlarged with 300ZX caliper hangers

smaller piston caliper

common pads

The Ebrake connection works well

This uses the LATE model/FLAT Maxima brackets(they must be milled for proper spacing)

 

 

 

4. 85-88 Maxima calipers brackets and 300zx rotors

This is the option I am working on. It has similar specs to the MM upgrade... You will need to source 2 sets of calipers

Large 11.4" dia. disk(must be reduced to 11.22")

Later Maxima caliper hanger

240SX caliper body

Late model/Flat maxima strut bracket(must have 0.2" milled off opposing sides for proper spacing)

 

 

 

 

5. Ross' Modern Motorsports 240SX calipers and custom bracket is a full package deal that uses the full dia. of the 84 300ZX disk... this is a well thought out system... It has the right balance of features to make it a very well thought out conversion....

 

 

 

 

 

 

***********************************************************************************************

 

 

Here are the details on the 4 lug rotors available for the various nissan cars...

 

 

Brembo 25110 early 280ZX Rear 10.6" disk

Type: Solid Disc

Overall Diameter: 269mm

Minimum Thickness: 8.6mm

Overall Height: 68.5mm

Fits:

1981 NISSAN 810 Excludes Wagon

1980 - 6/1981 NISSAN 200 SX

1979 - 1981 NISSAN 240Z / 260Z / 280Z / 280ZX 280ZX w/ Rear Disc

 

**************************************************************************

 

Brembo 25111 later 280ZX rear 10.15" disk

Type: Solid Disc

Overall Diameter: 258mm

Minimum Thickness: 9mm

Overall Height: 47mm

Fits:

7/1981 - 9/1983 NISSAN 200 SX

10/1983 - 10/1984 NISSAN 200 SX w/ Rear Disc

11/1984 - 4/1986 NISSAN 200 SX

5/1986 - 4/1987 NISSAN 200 SX 4 Cylinder

5/1987 - 1988 NISSAN 200 SX 4 Cylinder

1982 - 1983 NISSAN 240Z / 260Z / 280Z / 280ZX 280ZX w/ Rear Disc

1981 - 6/1984 NISSAN MAXIMA SEDAN

 

*************************************************************************

 

Brembo 25125 Maxima rear 11.22" disk

Type: Solid Disc

Overall Diameter: 285mm

Minimum Thickness: 8.6mm

Overall Height: 74mm

Fits:

7/1984 - 7/1985 NISSAN MAXIMA SEDAN

7/1984 - 7/1985 NISSAN MAXIMA WAGON

 

*************************************************************************

4-lug

Brembo 25139 300ZX 4 lug rear 11.42" disk

Type: Solid Disc

Overall Diameter: 290mm

Minimum Thickness: 9mm

Overall Height: 47mm

Fits:

1984 - 8/1985 NISSAN 300 ZX (Excluding Turbo)

******************************************************************

Ill complete this later...

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