How does an ABS delete kit perform on a Mazda RX-7 FC?

Performance-wise, deleting the ABS on an FC RX-7 comes down to a trade-off between street safety and track predictability, but how well it actually works depends entirely on how you handle the brake proportioning.

Here is what you need to know about how an ABS delete impacts the car and what it takes to perform correctly:

Braking Behavior Without ABS, you lose the safety net that prevents wheel lockup during a panic stop on the street. However, for track or aggressive performance driving, deleting the system removes the computer's interference. This gives you more predictable, manual control over the brakes and allows you to tune the bias to your driving style.

Engine Bay Space and Maintenance A major physical benefit of the delete is freeing up significant real estate in the engine bay, specifically around the turbo and the upper and lower intake manifolds ⁶. It is also the most common fix for a leaking factory ABS pump, as rebuild kits for the FC module are essentially nonexistent ².

The Catch: Brake Bias You cannot just remove the pump and "T" the lines together without negatively affecting your brake balance. The FC uses different proportioning valves and master cylinders for ABS and non-ABS models ¹. If you use a basic bypass kit while keeping the original ABS master cylinder and proportioning valve, your front-to-rear bias will be incorrect, which can make the car unstable under heavy braking.

How to Execute it Properly To get the car stopping correctly after an ABS delete, you have two main options:

1. The OEM Route: Swap in a complete non-ABS master cylinder and non-ABS proportioning valve. You will also need to source OEM non-ABS hardlines or bend your own. You must swap the master cylinder if going this route because the hardline fitting sizes differ between the ABS and non-ABS units ¹.
2. The Custom/Aftermarket Route: Route the rear line to the "R" port on the stock valve, T the front lines together and run them to the "F" port, and install an aftermarket adjustable proportioning valve (like a Wilwood unit) in the system ¹. This allows you to manually dial in your brake balance to compensate for the missing ABS hardware.

Difficulty: Moderate If you are fabricating your own bypass, you will need a quality flaring tool, line benders, and brake fluid. Take your time with the flares—a leaking brake line under pressure is a massive safety hazard. Once plumbed, you will need to thoroughly bleed the entire system.