Power Brake Units May Leak Fluid From Hydro-Boost Unit on Chevrolet 1500 Pickup

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: 138,000 (111,000–165,000)
10 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 1998, 1999
14 people reported this problem
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problem details
1990 Chevrolet 1500 Pickup 111,000 mi,
new booster fixed problem
1996 Chevrolet 1500 Pickup 165,000 mi,
not fixed yet. replaced pump, keeper and belt.