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

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: 138,000 (125,000–151,000)
9 model years affected: 1992, 1993, 1994, 1995, more1996, 1997, 1998, 1999, 2003
10 people reported this problem
1 person shared problem details
2003 GMC Yukon125,000
Leaks power steering fluid between the hydro-boost unit and master cylinder. Have not fixed yet, just add power steering fluid when needed.
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