Technical Service Bulletins Parts

Dirty Steering Kills Hydro-Boost

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Dirty Steering Kills Hydro-Boost

This bulletin applies to 1998-2013 Chevy Silverado models equipped with the Hydro-Boost system. Customers may notice that the brake pedal will move down or self-apply during or near full-lock turns.

This can be caused by the internal dump valve of the hydro-boost not seating properly due to contamination in the steering system.

The hydro-boost assembly is not tolerant to certain types of contamination in the steering system. The hydro-boost system is not serviceable and must be replaced.

Note that before replacing the hydro-boost system, the entire steering system (including power steering pump, lines, cooler and gear box) must be flushed to avoid reoccurrence of the problem.

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