Power Brake Units May Leak Fluid From Hydro-Boost Unit on GMC 3500 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.

RepairPal Verified
Average mileage: 173,428 (125,000–278,000)
11 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 1998, 1999, 2000
18 people reported this problem
4 people shared problem details
1990 GMC 3500 Pickup198,000
cant find booster with pushrod instaled from reman. company anywhere
1998 GMC 3500 Pickup170,000
leak at brake booster
1997 GMC 3500 Pickup150,000
not fixed yet but checked out defently leaking there
1997 GMC 3500 Pickup125,000
Leaking from P/S fluid from hydroboost unit, replaced unit.
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