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Z31 to Z32 Front Brake Swap

Z32 front brake caliper and rotor installed on a Z31 300ZX

You can increase the stopping power of your front brakes by using the front rotors and calipers from the later 1990–1996 300ZX.

Warning: Do this modification at your own risk. We are not responsible for any issues caused by your own work.

Tools Needed

  • Jack
  • Jackstands
  • Line Wrench
  • Ratchet
  • 17mm Socket
  • Cutoff wheel or Hacksaw
  • Punch
  • Hammer
  • Breaker Bar
  • 30mm Axle nut socket

Parts Needed

  • 1990 26mm Non turbo front calipers
    Z32 26mm front calipers and rotors
  • 1987 - 1989 Turbo front Hubs
  • 1990 - 280mm x 26mm Front rotors
  • 0.170" Spacer
Tech Tip: You can also use the larger 30mm Z32 calipers and rotors, but you must match the set. You cannot use a 26mm caliper on a 30mm rotor and vice versa.

Installation

  1. Jack the front of the car up and secure on jackstands.
  2. Remove the front wheels.
  3. Remove brake caliper and line from the car.
    Old brake setup
  4. On models other than 87+ turbo, remove the front hub assembly and replace with the 87+ turbo front hub.
    Hub assembly
  5. The Z32 caliper is much longer than the Z31 caliper. By cutting an inch or so off the dust shield, the caliper will now fit without rubbing.
    Dust shield modification Dust shield clearance 1 Dust shield clearance 2
  6. Install the Z32 front rotor by slipping it on the wheel studs.
  7. Next, install the spacer so the caliper will be centered.
  8. Connect the brake lines. You no longer need to modify the Z32 caliper to fit the Z31 brake lines: ready-made conversion lines are available, such as the P2M Z32 front brake line conversion from Enjuku Racing.
    The old method: modifying the caliper for the Z31 brake lines
    1. First, separate the two halves of the caliper.
    2. Then remove the piston in front of the fluid inlet.
      Brake line fitting hole
    3. Once piston is removed this is what you'll see.
      Inside caliper
    4. Just take a punch or similar and tap the orifice out from inside out.
    5. I found it necessary to stick a Phillips in the front of the inlet and turn the orifice to "break" it loose.
    6. This is what you are removing.
      Restrictor
  9. Install the caliper and bleed the brakes.
  10. Install the wheels and lower the car.

Other Information on this swap

This swap is known to work with the 87-89 turbo and non turbo wheels. 1986 Non turbo wheels rub the caliper slightly at the bottom face caused by the hub section of the wheel. At this time it is unknown if the 84-85 Turbo and non turbo and the 1986 turbo wheels will work without rubbing the new caliper.

Sources Used