Power Brake Units May Leak Fluid From Hydro-Boost Unit on GMC 2500 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: 182,002 (86,508–253,000)
11 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 1998, 1999, 2000
16 people reported this problem
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Viewing 1 - 3 of 3 problem details
1997 GMC 2500 Pickup 227,000 mi,
POwer Brake Unit LeakS Fluid From Hydro-Boost Unit
1996 GMC 2500 Pickup 161,500 mi,
Bad hydro-boost unit. Had to replace. Advance Auto has rebuilt unit with lifetime warranty for under $200 plus core charge.
2000 GMC 2500 Pickup 86,508 mi,
hydroboost leaking, dealership confirmed must be serviced for $1200!