How to Fit Z32 4 Pot Brakes to your 84-86 Turbo or any NA

Here is a comparison of the Hub Before & After



Step 6

Put two hubs side by side on a flat level surface, Refit a Z31 rotor to the first hub then fit a Z32 rotor to the second hub

Take measurements to the center-line of the rotor from both the Z31 & Z32, this is so you can make a spacer for the 4 pot caliper as it needs to be pushed out further. Subtract the diffidence and use this value ( i got approx 10mm ) and go make a spacer. You will also need thin washers in addition to your spacer so you can get this perfectly centered up.



I have used an oversize nut ( FOR MOCK UP PURPOSES ONLY ) as a spacer, this is to allow trial fitment so that a spacer can be machined from round stock, to the correct dimensions. As Stated before use thin washers to "fine tune" until you have the caliper centered over the rotors



You will need to re check your spacers after the hubs have had their wheel bearings fitted, because if you do a "Dry run" to take your measurements they may change when the hub is packed with grease & torqued down onto the spindle

Note

When comparing the heights of the rotors , you can see why the 4 pot caliper needs to be spaced out.
I am using 30mm thick rotors, this will look different if you use the 26mm thick rotors.



Step 7

Take your caliper and fit it to the Strut with your spacers ( reuse the bolts from your original Z31 brake calipers ) Bust out your Calipers and use the height measure thingy so you can decide how much longer the bolts need to be.



now go out and buy the highest grade shanked Bolts you can find that are approx 6-8 mm longer.
USE YOUR OWN MEASUREMENT HERE as my spacer isn't thick enough.


Step 8

If you decided to put in new wheel bearings Refer to your FSM and do this now

if not carry on and put shit together ( my photo's show it a bit out of order but you get the idea )








My Pictures show a 20mm spacer and fitment of a factory 85 Turbo wheel, clearance

Step 9

Get your PDM conversion brake lines and fit these as you would any other brake line, follow your FSM procedure and you should be fine.

It is also a great Idea to get your brake calipers rebuilt and use BRAND new Rotors and Pads.


Don't forget to check out my How To for 88T rear brakes on 85T rear control arms
you can see that here viewtopic.php?f=24&t=29872&p=340142#p340142

James,
Very nice write up. Good thing 88T hubs are hard to come in New Zealand :lol:

It should do the trick nicely, the machine work in most cases should be a lot less than the cost of a 88 turbo hubs

Nice write up this looks like this might be the better option for how I am currently doing my build

You can also take the 4-pot calipers apart and knock out the bubble flare so you can use Z31 style front brake lines for people who don't want to spend extra money on conversion lines. Might as well rebuild the calipers when you have them apart and can get a rebuild kit from Z1Motorsports.com for less than $20.

Re: How to Fit Z32 4 Pot Brakes to your 84-86 Turbo or any N

so z32 has a 68mm hub instead of the z31 66.1? you machined that 66.1mm surface to slip a sleeve over it to make it 68 without using a shim?

Re: How to Fit Z32 4 Pot Brakes to your 84-86 Turbo or any N

No That's not correct

where the brake rotors locates is 68mm, otherwise the brake rotor would not be centric and would wobble around

Where the wheel locates is still 66.1, this is why in my guide it recommends providing a brake rotor and wheel along with your hubs to your machinist so that no stuff ups happen.