Hydro Boost leak? - Chevy and GMC Duramax Diesel Forum
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Old 12-29-2009, 05:16 PM   eBay Motors  #1 (permalink)
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Hydro Boost leak?

My hydro boost is leaking. Not terrible, but its leaking. It's leaking where the aluminum body that holds the fluid resivoir and black body mate up. Dont know what it's called i'll post a pic. Haven't tried tightening the two bolts yet! Is there just a gasket i can change or do i have to change the whole thing? Any special instructions? I've never messed w/ this before. Do I have to bleed brakes?

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Old 12-30-2009, 04:29 PM   eBay Motors  #2 (permalink)
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No One?????
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Old 12-31-2009, 05:33 AM   eBay Motors  #3 (permalink)
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Not sure how/if theirs a gasket but get on that fairly quick...if that bad boy goes so do your brakes...which I'm sure you already know. Just being the worried momma
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Old 12-31-2009, 05:50 AM   eBay Motors  #4 (permalink)
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I do not think you can easily just replace a gasket. Usually if they are leaking there it is time to replace the unit.
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Old 12-31-2009, 06:03 AM   eBay Motors  #5 (permalink)
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Quote:
Originally Posted by crazycrew View Post
No One?????
No, there is no gasket and the bolts aren’t loose. You need to replace the Hydro-Boost unit. Easy stuff, and no need to get into the brake system. Get the part ordered (see below) and keep an eye on the PS reservoir…don’t let it run dry.

Remove the nuts on the two studs, and push the Master Cylinder forward to clear the studs. There’s enough flex in the tubing to do so. Remove the high-pressure lines (with fittings) on the HB unit, along with the low-pressure return line (hose clamp). This line will be stuck, just twist left and right to break the seal and remove. Use caution when pulling that line off, you’re wrist will inevitably strike the metal support on the firewall and slice you open.

On the inside, remove the keeper for the push rod attached to the brake pedal. Remove the four nuts from the studs and pull the unit out from the engine side. Installation is reverse and the unit is self-priming. However, you should flush the system to start anew and add this to your regular maintenance schedule to prolong the life of the system components.
Power Steering/Hydro-Boost Flush
Chances are, had this been done on a regular basis, you wouldn't be out $300 for the repair. The fluid is easily torched and loses viscosity, wearing the piston and causing the seals to eventually leak.



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Old 12-31-2009, 06:13 AM   eBay Motors  #6 (permalink)
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Leak

If it is leaking oily fluid, it is the Hydro unit. However, if it is leaking brake fluid, it will be the seals in the mastercylinder.

It is best to replace these with new parts and not trying to rebuild, or install a used unit.

You can tell the difference-- place a little on your finger and try to wash it off with water only- brake fluid will wash off- Hydro fluid will not, without soap.
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Old 03-16-2010, 12:19 AM   eBay Motors  #7 (permalink)
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Not sure how/if theirs a gasket but get on that fairly quick...if that bad boy goes so do your brakes...which I'm sure you already know. Just being the worried momma
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Old 02-21-2011, 09:07 AM   eBay Motors  #8 (permalink)
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Same part number for an 02?
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Old 02-08-2013, 06:10 AM   eBay Motors  #9 (permalink)
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What about using aftermarket hb unit? Cardon and Wagner both make replacement units that can be had for less. How are these units conpared to factory replacement?
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