Can a leaking Anti-lock Braking System pump on a Mazda RX-7 FD be fixed?

Yes, a leaking ABS pump on your FD RX-7 can potentially be fixed, but the exact solution depends on where the unit is leaking.

Difficulty: Moderate

Here is how you can address the issue:

1. Inspect and Replace the Crush Sleeves Before assuming the pump itself is dead, clean the unit thoroughly and trace the exact source of the fluid. The leak is often caused by the crush sleeves on the lines. Replacing these sleeves is a straightforward repair that will stop the leak if that is the root cause ¹.

2. Internal O-Rings and Rebuilding There are internal O-rings inside the pump that can fail. While the Factory Service Manual notes that you can "inspect," "repair," or "replace" parts, there is essentially no documentation available on how to actually rebuild the internals ¹. Because of this lack of information, attempting a full rebuild of the pump is generally not considered viable.

3. Replace the Unit Internal ABS pump leaks on the FD are quite uncommon. If you determine the leak is coming from the pump body itself and not a crush sleeve, the standard and most reliable fix is to replace the unit entirely with a known-good, used ABS pump ¹.

Safety Warning: Do not let this leak go unaddressed for long. Brake fluid is highly corrosive, and if it pools under the ABS pump, it will quickly eat away at your vehicle's paint and undercoating ¹.