here are the brakes - break it up break it up break it up

source: [classiczcars.com]
Replacement brakelines will be 3/16" with Japanese M10x1 tube nuts on them.

• AGS PolyArmour PAC-325 BRAKE LINE (3/16" x 25ft) - $20 (advanceautoparts)
• M10 X 1.0mm Japanese tube nut for 3/16" tube:
  - BLF-40C-5 - Carded (5 fittings per card/10 cards per case) - $2.50 (advanceautoparts)
  - BLF-40 - Bulk/Bagged (10 fittings per case/bag) - $10 (advanceautoparts)

Additional parts

• Wilwood brake proportioning valve #WIL-260-8419 - $42 (Summit)

To install the Wilwood brake proportioning valve I'd need the following:

• 1/8 NPT to 3/8-24 adapter #WIL-220-4024 (2x) - $2.50 (Summit)
• 3/8-24 inverted tube nut for 3/16 line - AGS BLF-10C-5 $2.50 (advanceautoparts)

  brake piping	simple schematic

The stock pressure regulating valve will be replaced with the Wilwood BPV. Consensus is that it's not a good idea to have the stock regulating valve (trying to) regulate the pressure as well.
The Wilwood BPV simply installs somewhere in the rear brake line (#5), in my case such that it'll be accessible from the cockpit cuz it should be possible to adjust pressure on the track. What the BPV in simple terms does is limit/increase pressure to the rear brakes. For more detailed info, check this white paper out.

Increasing braking power

• Wilwood 260-8794 1" brake master cylinder - $122 (Summit)
  Modification is described in this guide, compiled from this source on HybridZ
• 8.5" 280ZX booster A-1 CARDONE Part # 535104 - ($118 - Rockauto)

Here's a pretty good description on how brake boosters work.

Hand/parking/e-brake 

Like all other parts exposed to road salt and the elements, the handbrake cable has turned into a string of rust.

S30 handbrake system

Sourcing an OEM or similar replacement was either very expensive ($280 from MSA) or impossible. Your options are to do a 300ZX (Z32) or '91-'94 240SX handbrake conversion, or try to make the universal Lokar handbrake cable work.

300ZX/Z32 handbrake	91-94 240SX handbrake	Lokar cable

But...while browsing thru Rockauto.com's inventory, I discovered this 280Z Raybestos BC92952 cable for less than $58. It looks pretty much like that of the 240Z. Haven't been able to figure out the exact differences but making it fit can't be as much work as doing a Z32 or other conversion.

Raybestos BC92952

But in the meantime I also ebayed this Z32 front cable for $10, just in case the 280Z cable wouldn't work out :)

Z32 front cable	Z32 vs S30 equaliser