Power Brake Units May Leak Fluid From Hydro-Boost Uniton GMC Suburban 2500

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.

RepairPal Verified
Average mileage : 165,000 (165,000–165,000)
8 Years Affected: 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999
10 people reported this problem
1 person shared problem details
I lost power steering and power breaks. Everything works with "Armstrong" steering and breaks, but there is no way my wife can use it this way.
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i have can you tell if its your brake boost thats gone bad or your master cylinder

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