March PS pump & Hydroboost, Must Read

[CarlC]

This is the same problem I had with mine, but the backpressure was a result of trying to combine the returns from the steering box and HB into a "T". The return from the box and HB were on the same run (the "T" mounted on the box) and the return to the reservoir on the leg. The fluid shooting out of the box resulted in the HB seeing a backpressure that would apply the brakes. The faster the engine rev'ed, the more the brakes would apply.

Lesson learned? Run a separate return line for each and try to have them end separately into the reservoir.

The stock reservoir, with the available airspace and proper venting system, is very good. High-rpm road coarse use will require a non-reservoir'ed pump (P), remote reservoir, and cooler. Every attempt I've seen to use some type of integrated reservoir with a P-pump has resulted in failure when used on a high-RPM road coarse application.