One Ton Master Cylinder Adapter Kit

The good ol' GM 1 ton master cylinder has been a popular upgrade for the older sas'd trucks, and now you can do the same with your newer rig!



Master Cylinder Adapter Kit

If you've swapped in tons on your 05+ Tacoma you need this kit. The stock master cylinder and even the Tundra master cylinder are insufficiently sized for the job. More than likely if you've tried to use the stock master you've ended up with a soft pedal that goes to the floor before you come slowly to a stop. Well, here's the solution.

Compatibility with the FJC and 4Runner are being checked now.

This kit adapts the 5.7L Tundra dual diaphragm booster and the GM 1 ton master cylinder to your firewall and stock brake pedal. No cutting is required as it all just bolts up. The new master does take up a bit more space, so keep that in mind.

The kit includes the following:

• Interior pushrod extension (the Tundra pushrod is significantly shorter than the Tacoma)
• Waterjet cut Adapter plate between the booster and master (offset bolt patterns)
• Brake line tube nuts (sized to fit the master and the standard 3/16" brake lines)
• Plunger adapter (CNC milled to fit accurately between the booster and master)
• Oring to seal the master to the adapter plate
• All needed hardware

What's not included

• GM 1 ton master cylinder
• Tundra 5.7L dual diaphragm booster

The master cylinder can be picked up quite cheaply at any parts store, or online. The booster will need to be sourced at a parts yard or Ebay. I have had the best luck with ebay, finding them in the $60 range. You're looking for a 2008+ booster from a 5.7L Tundra. Match the booster to the image above for verification.

 

Hey man, blackpearl_yota form Instagram - just recently finished up a SAS on my 08 tacoma. Diamond axle, rcv, 5.29s, 3link, ORIs, 95 land cruiser rotors and calipers, 37” tires. I want to upgrade the brake more, would this 1ton kit be overkill? Should I go more the tundra swap route? I do plan on swaping to 1tons in probably 5ish years or so

 

Front and rear discs? Your best bet is to calculate the size of the pistons in the LC calipers and then compare that to the size of the MC bore. Here's my writeup on the ratios I went with.

https://www.tacomaworld.com/threads...-solid-axle-swap.497018/page-28#post-17287560

Let me know if you have any questions.