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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 153,961 (37,000–277,000)
15 model years affected: 1992, 1993, 1994, 1995, more1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006, 2011
84 people reported this problem
Viewing 1 - 20 of 40 comments
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.
for the 4th time since I boght this new, I have this leak. Before I always had it repaired...is this soemthing that I can do myself, I have done ALOT of car repairs...not just changing a tire, just never tried this...is the system pressurized or is it basically take off the old, install new power steering fluid, and bleed brakes???
Power steering fluid leaking from where master cylinder and hydro boost bolt up.
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. OBVIOUSLY...it 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 it....it is the break system that sucks. If anyone knows how to please let me know.
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.
brake fluid leaking between master cylinder and brake booster
leaking power steering fluid between brake master cylinder and Hydro-Boost Unit. Replace Hydro Boost Unit.
Leaks steering fluid, appears to be from up toward where the steering wheel comes through the fire wall.
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.
Fluid leaking between master cylinder and hydro boost.
Power brake booster leaking on connection that's closest to master cylinder
Leeking fluid at firewall not fixed need to know op
It's leaking behind the master cylinder , the break booster is
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. http://www.gmtruckclub.com/forum/showthread.php/19182-Bleeding-ABS-brakes-w-o-Tech-1-Scan-Tool
I have just diagnosed the same problem. Mine is also leaking around the bolts that hold on the Hydro Booost unit to the firewall mount.
hydro-boost unit leaking power steering fluid. 136000 miles. replaced the unit and pump to repair.
Leaking powersteering out the hydroboost. Sigh
01 silverado 2500 hd leaking oil from power booster i have no brakes.
Fluid leaking across the brake pedal shaft onto the brake switch witch will screw up cruise control
Fluid leak near the front of the engine. No power steering or brakes.