Car Problem Reports

Chevrolet Suburban 2500 Power Brake Units May Leak Fluid From Hydro-Boost Unit

Chevrolet Suburban 2500 Problem
58 Reports
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Model Years Affected: 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003, 2005, 2006

Average Mileage: 158,280 mi (37,000 mi - 270,000 mi)


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.

  • Power Boost Brakes and power steering fluid leak, I had the leak start awhile back, cant afford to pay to fix it, so I used the Oil Resistant Gasket sealer, with extremely great results!!!! I applied the gasket sealer around the seam between the master cylindar and the power boost component, no leaking at all.

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  •  Rookie

    I have a GMC 2500 Suburban....I have replaced the Hydro-Boost SEVERAL times...
    The suburban has a hard time stopping when it gets hot. The steering locks up and the
    suburban does not want to stop.

    I have called GMC company to see if they have had a recall...since I have replaced it several times. They said no. I told them the problem and they said they don't know what to tell me. is a problem with many suburbans. You would think they would get this fixed.

    I would like to know how I can get this exchaged from a Hydro-break booster to a vacuum break booster since this is not working. This is rediculious and it has become to the point of being VERY EXPENSIVE AND VERY DANGEROUS. I am mechanically inclined and would like to do it myself.

    I don't want to get rid of my suburban I love is the break system that sucks. If anyone knows how to please let me know.

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  • , , 190,000 mi

    Power steering fluid leaking from where master cylinder and hydro boost bolt up.

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  •  Rookie

    for the 4th time since I boght this new, I have this leak. Before I always had it this soemthing that I can do myself, I have done ALOT of car repairs...not just changing a tire, just never tried the system pressurized or is it basically take off the old, install new power steering fluid, and bleed brakes???

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  • , , 130,000 mi

    brake fluid leaking between master cylinder and brake booster

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  • , , 265,500 mi

    Sameproblem, I have replaced this with the dealer 4 times. This last time could not afford the almost $1200 they wanted, went up $500 in 4 years... anyway, went to Autozone, got new one, a few hours, cramped quarters under dash for the 4 mounting bolts, but it went on very smoothly, bled ABS with no problems and everything is great, under $200.00 at autozone. While I awas trying to decide how to fix (dealer or myself) I was using the black oil resistant gasket material around the entire seam between master cylindar and booster, only had to rea ppy twice in several months- it worked really well and got me to the time that I had the monies to fix.

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  • , , 270,000 mi

    leaking power steering fluid between brake master cylinder and Hydro-Boost Unit. Replace Hydro Boost Unit.

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  •  Rookie

    leaking power steering fluid around brake booster. Ended up replacing brake booster and master cylinder (since they were both original). The brakes were always soft, but after replacing booster and cylinder they seemed even worse. I took it back to shop and had them bleed the ABS. This is difficult to do and you need a special tool to cycle the ABS, but it worked great! Brakes are better than ever now, and I am not afraid to trailer horses anymore!! See this article for more detals on bleeding the brakes.

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  • , , 160,000 mi

    My 2002 Chevy Suburban 2500 8.1 L 4x4 leaks power steering fluid badly. It appears that the leak is directly between the two pieces of the brake/power steering unit located on the firewall. This leak has caused my entire drivers side of the engine compartment to be coated with oil as well as the underside of the vehicle. I have to add oil every other week or I have no power steering. I haven't got it repaired yet and am trying to figure out what parts I need.

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  • , , 200,000 mi

    Leaks steering fluid, appears to be from up toward where the steering wheel comes through the fire wall.

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