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GMC Jimmy Problems

Power Brake Units May Leak Fluid From Hydro-Boost Unit on GMC Jimmy

Problem Description and Possible Solution

Power brake systems using "hydro-boost" may leak power steering fluid from the hydro-boost unit located behind the brake master cylinder. Replacement of the hydro-boost unit is the common repair to correct this concern.

(2 people reported this problem)

GMC Jimmy Vehicles With This Problem

RepairPal Verified
Average mileage: (–)
2 model years affected: 1990, 1991
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Brake problem? Or maybe a faulty head gasket cylinder?
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