4-piston brake conversion questions

[Seanh]

Yeah, I think 85 is the cut off year for compatibility, or atleast thats what I'v read. Make sure you ask for the 4x4 ones, that price I was quoted was for 2x4 ones and when I went back to get them the price was quite a bit higher for the 4-piston 4x4 ones, so I opted to get them from the junk yard.

[smg1404]

Of course I no longer need to look. I should be getting a set in the near future.... I'm excited, I get some real stopping power. I wonder do I need to change anything else, ie master cylinder etc.??

[Ed]

O.K. SO let me see if I got this right. I have a 73 with stock brake clipers with the S/S lines. Now, if I go to Toyota or Napa and order some stock 1985 Toyota 4X4, 4cyl, 2.4 l. Brake calipers. They would be a direct bolt on? No modifications? I would go from a 2 piston to a 4 piston in about 1 hour?

[2ManyZs]

It will probably take a little more than an hour, but the modifications you need to do are quite simple. You need to cut the dust shield for caliper clearance and bend the hard line to the caliper. That's about it, a few careful bends in the line, and a few snips with the tin snips or rotary tool and you should be good to go.

To answer an earlier question, you do not have to change the master cylinder (unless yours is of questionable operation that is) to do this swap. You can, however, upgrade to the later master cylinder with the 15/16 bore for a little higher line pressure (possibly) and fluid capacity. Not sure if there is a big difference in the actual line pressures, but a little more fluid is probably a good idea since you are now feeding twice as many pistons on the front brakes.

[smg1404]

I'm probably not the expert on this, but that is what I think happens. Evidently the Toyota brakes are made by the same vendor as the Datsun brakes. They appear to be enhanced versions of the same caliper.

[Seanh]

I'm probably not the expert on this, but that is what I think happens. Evidently the Toyota brakes are made by the same vendor as the Datsun brakes. They appear to be enhanced versions of the same caliper.

Thats right, they are made by the same company. They are exactly the same pretty much. The calipers for the 2x4 Toyota trucks of the 79-85 model years are the exact same as our stock 2 piston brake calipers.

[XYZ]

I have not changed my stock master cylinder and everything is working fine. Of course I have nothing to compare too since I don't know what the brakes feel like with a larger cylinder but mine work great as is. I imagine the SS lines help with the line pressure though. Tin snips work really well for cutting the back dust plate and the 'S' shape line is not too hard to bend. You probably need about a half day or so depending on your competance in working on cars. Another thing I did was upgrade the brake fluid to Dot 4. When you remove your existing calipers you can let your cylinder drain out and then refill with the higher rated fluid.

[smg1404]

I did not reinstall mine when I was replacing the wheel bearings, so i will not have to trim anything. I hope they are not needed. I couldn't think of any reason to put them back on and they weighed a pound or so...... SO no plates.

[Z-point]

For what it is worth

Hi,

Because these callipers are too heavy to send to Holland or any place else, I hunted them down here in Holland at the local store at least I think I got them.

I've you have a good look at the calliper you will find the mark S12 on it. That’s the mark where all the experts talked about in there stories.

Below are the models from Toyota which have the callipers on, but I think Toyota prices are high! These are remakes; they told around 145 euro that’s about us$140. They are from Hitec.

HI-LUX 2.2 4X4 YN106/110 MOT.4Y 69KW 01-89

4-RUNNER PICK-UP TYPE N13 01-90 12-93

LANDCRUISER 2.4 4CIL RJ70 MOT.22R 81KW 03-86 03-90

[kmack]

I'm coming late into this discussion, but I'm getting set to try this set-up. My question is this:

Autozone lists 2 types of calipers for the 79-83 Toyota 4x4 pickup. One has a 32mm bore size and the other has 42mm bore size. What are the differences and will those differences matter when mounted on a 240Z? Also will the differences cause any clearence problems?

I haven't checked any other parts suppliers yet, so I don't know if they offer the same bore sizes.

[XYZ]

Kmack-

Try these numbers RC3465 and RC3466. They're Raybestos remanf. calipers purchased through checker auto parts. They're for a Toyota 4x4 '85 pickup. Don't know if these are regional #'s or not but worth a try. I was never given a choice on piston sizes so I can't answer your question but maybe these parts #'s will.

Good luck. The dust plate can be cut easily with some tin snips and it's pretty much a straight bolt on.

[2ManyZs]

These are the numbers I got from an ex-buddy who worked at Auto Zone for the 79-84 4x4 calipers.

FWIW anyways....

7142 L/H 7141 R/H

$69.94 each plus 30 core

D137 Carbon metallic pads to fit were $11.99 back then