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

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.

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Average mileage: (–)
2 model years affected: 1990, 1991
2 people reported this problem
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