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Old 12-30-2014, 10:39 AM   #1
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Question GM Hydroboost Weeping.., a little to much.

My original GM brake system hydroboost has been weeping a little power steering fluid for a few years now, but recently showing signs of getting worse......, time to change it out. From what I gather this is a common issue with GM hydroboosts, and can be a costly venture depending on what auto shop you take it to.

Has anybody done their own GM hydroboost R&R? I'm debating whether to tackle it myself (I have the tools), or find a shop that won't dig to deep into my pockets. The master brake cylinder is fine, not sure if I can R&R the hydroboost and leave the brake fluid lines connected (save bleeding the system).

Check "Google/You Tube" and appears doable, but R&R can also turn into a messy "one thing leads to another" type of project. Don't want to go the repair kit route, considering a rebuilt or new hydroboost.

Any thoughts/advise

Bob
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Old 12-30-2014, 11:02 AM   #2
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I had to replace all the rotted brake lines on my 04 but so far my hyroboost is ok. How are your brake lines? look along the frame near the drivers door..
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Old 12-30-2014, 11:11 AM   #3
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Hardest part is under the dash. At my age I'm letting someone younger do it. I'v been able to get mechanic off craigslist pretty cheap when I need extra hand. You'll be there supervising so no problems.
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Old 12-30-2014, 12:39 PM   #4
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When my hydraboost unit started leaking, I found an independent rebuilder to exchange mine with, and I found a GM mechanic to change it on the side for cash.

It didn't hurt too bad.
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Old 12-30-2014, 02:22 PM   #5
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I helped change one in a mid 90's model. PITA but it is doable. Definitely helps to have someone there.
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Old 12-30-2014, 03:12 PM   #6
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Quote:
Originally Posted by Rustic Eagle View Post
Check "Google/You Tube" and appears doable, but R&R can also turn into a messy "one thing leads to another" type of project. Don't want to go the repair kit route, considering a rebuilt or new hydroboost.

Any thoughts/advise

Bob
Bob, it may be time for you to emerge from the Dark Side and upgrade to that new Ford diesel you've always wanted!
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Old 12-30-2014, 03:48 PM   #7
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Quote:
Originally Posted by Rustic Eagle View Post
My original GM brake system hydroboost has been weeping a little power steering fluid for a few years now....
I've had to replace my hydroboost lines a couple of times. So far no leaks from the hydroboost unit itself - where is your hydroboost unit leaking from and roughly how much is it leaking (I want to know what to look forward to)?
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Old 12-30-2014, 03:57 PM   #8
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Crabman is clueless on this issue, but nambarc says he is up to the challenge if you need help.
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Old 12-30-2014, 05:04 PM   #9
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Originally Posted by 33 RLDS View Post
snip...... How are your brake lines? look along the frame near the drivers door..
Brake lines look great, the truck has never experienced the Michigan salt...., keep my TV in the garage during the Michigan winters, or in the Texas Hill Country as I'm doing now.

Quote:
Originally Posted by TCNASHVILLE View Post
Bob, it may be time for you to emerge from the Dark Side and upgrade to that new Ford diesel you've always wanted!
Almost did it this year, but needed to replace my grocery-getter....., may pull off the the new F-350 next year.

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snip..... where is your hydroboost unit leaking from and roughly how much is it leaking (I want to know what to look forward to)?
The following pic's (taken in the last hour) are of my Hydroboost/Master Cylinder assembly. The hydroboost unit is mounted to the firewall, and the brake master cylinder is mounted to the hydroboost. You can see how the power steering fluid has been blown back (engine fan) covering most of the hydroboost unit, and little fluid covers the back area of the brake master cylinder:



The source of the fluid is from a 'weep hole' located at the bottom of the hydroboost mounting flange where the master cylinder mounts to the hydroboost. Apparently as the internal seals/o-rings fail the hydroboost fluid will leak out the weep hole.





My understanding is that the hydroboost uses the power steering fluid pressure to function. The hydroboost unit replaced the old big vacuum canisters that use to be mounted behind the master cylinder......, guess the newer engines don't give off enough vacuum.

When the hyperboost fails it then directly impacts the operation of the brakes and power steering.

Below is a good "how to" link and shows how challenging the project can get if one wants to rebuild their own hyperboost unit (not me).

http://www.duramaxforum.com/forum/di...iscussion.html

Bob
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Old 12-30-2014, 05:12 PM   #10
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Bob, thanks for posting those very clear pictures and explanation. My future awaits...
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