Brake reservoir cap recall

On BAT, in the gated 599 conversion listing, EAG posted interesting observations on the brake fluid reservoir cap. Sounds like if you don’t replace the cap under warranty, you risk brake fluid leaks/failures, but if you do use the new cap, you risk moisture and boiling. Has anybody experienced failure either way?

From EAG:
If your original brake reservoir cap is still functioning effectively, and you haven’t encountered any problems, it may be in your best interest to retain it. The recently designed cap, which comes in black as opposed to the clear or yellow caps of earlier models, is supposedly vented. The concept of this design is intriguing. The cap possesses a rubber gasket, which appears to have a hole cut into its center, presumably with a sharp tool, and a relief slot cut into the thread area of the plastic cap.

Our recent analysis across a range of vehicles has shown a noticeable variation in moisture content when the new cap is used compared to the older versions. Vehicles with the new brake cap consistently demonstrate a moisture content between 6 to 8 percent. On the other hand, cars with the older caps show moisture levels ranging from 1 to 3 percent. The latter is typically seen when the brake fluid has not been serviced for an extended period.

We believe this discrepancy in moisture content is due to the vented opening in the new cap design. The design appears to inadvertently expose the brake fluid to the atmosphere. Since brake fluid is hygroscopic, it tends to absorb moisture from the environment when exposed. With increased moisture content, the brake fluid’s boiling point decreases. This can become a significant issue in hot weather or during spirited driving, potentially causing the brake fluid to boil, which could result in reduced braking performance or even total brake failure.

Ferrari’s recommendation to check your fluid level subtly suggests a systemic leakage issue that the company seems to be aware of. In past experiences, our colleague Art noted brake fluid seeping inside several F430 models being converted. When the local dealer was confronted with this issue, the leakage was casually dismissed as a ‘normal’ occurrence. Over time, we have observed a considerable number of 360, 430, 599 models leaking brake fluid inside the cabins via the brake booster. It seems that the Brake Master is a common point of failure, leaking fluid into the booster and subsequently into the cabin.

This year alone, we at EAG have replaced four complete Brake Master Booster assemblies. A noteworthy instance was when Art, while test-driving a 360, found himself with non-responsive brakes approaching a red light. His timely reactions, downshifting and applying the mechanical handbrake, prevented a potential disaster. The inspection and removal of the booster assembly in that vehicle revealed clear evidence of brake fluid leakage, both outside against the firewall and inside the cabin.

Given these findings, it’s crucial for you to inspect your pedal box and booster assembly regularly. If you notice any dampness that suggests fluid leakage into the cabin, it is strongly recommended to schedule a service appointment immediately and avoid driving the vehicle if possible. Despite bringing these issues to Ferrari North America’s attention, our concerns were regrettably dismissed.