Power Steering Fluid Leak Diagnosis in Hydro-Boost Brake Equipped Trucks

Power Steering Fluid Leak Diagnosis in Hydro-Boost Brake Equipped Trucks

Power steering fluid is leaking from the rear of a master cylinder on a truck equipped with hydro-boost brakes. Which of the following is the most likely cause?

A. By-passing master cylinder
B. Primary seal leaking
D. Brake booster leaking

Final answer:

The most likely cause of power steering fluid leaking from the rear of a master cylinder on a truck equipped with hydro-boost brakes is a secondary seal leaking.

Explanation:

The most likely cause of power steering fluid leaking from the rear of a master cylinder on a truck equipped with hydro-boost brakes is a secondary seal leaking.

The hydro-boost system uses power steering fluid pressure to assist with brake operation. The master cylinder is responsible for supplying hydraulic pressure to both the power steering system and the brake system. If the secondary seal of the master cylinder is leaking, it can allow power steering fluid to escape and accumulate at the rear of the cylinder.

To fix this issue, the secondary seal of the master cylinder needs to be replaced to prevent further fluid leakage. It is important to address this issue promptly, as power steering fluid leaks can affect the performance of both the power steering and brake systems.