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Welcome to the 3500HD.com forum created October 2009

Author Topic: Hydroboost question  (Read 2594 times)

ED-NY

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Hydroboost question
« on: December 20, 2015, 09:29:23 AM »
I have a few hydro-boost setups that I removed over the years. Converting a non hydro 1994 cab to hydro-boost and noticed that on one unit the aluminum pressure cylinder is very loose..it actually rattles.  This is the blue aluminum cylinder 1-3/4" X 3.5" and marked caution.

Going to use another unit that is tight..but what could be the problem with the cylinder being loose like that?

GM Guy

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Re: Hydroboost question
« Reply #1 on: December 20, 2015, 09:56:02 PM »
not for sure really, IIRC its an accumulator, IDK if its a spring, or nitrogen, someotherguy would probably know more.

ED-NY

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Re: Hydroboost question
« Reply #2 on: December 20, 2015, 10:01:54 PM »
not for sure really, IIRC its an accumulator, IDK if its a spring, or nitrogen, someotherguy would probably know more.

There is a high pressure warning on it...but as I indicated...it feels likes it's about ready to fall off.  Did remove the booster and have the hydro-boost installed.

Raymo

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Re: Hydroboost question
« Reply #3 on: December 21, 2015, 02:28:40 AM »
Depending on where it came from, I think some had a spring inside, while others were charged with nitrogen to provide stopping power in the event you lost pressure from the power steering pump. Sounds like the retaining ring went AWOL. I'm willing to bet it would be best to tear it down or replace it at least.
'94 3500-HD, Cummins, Getrag, NP205. Shortend rear frame with a Pickup Bed. Dana 60 front, stock 80 rear.

'03 2500-HD 8.1 and Allison

ED-NY

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Re: Hydroboost question
« Reply #4 on: December 21, 2015, 07:49:10 AM »
Depending on where it came from, I think some had a spring inside, while others were charged with nitrogen to provide stopping power in the event you lost pressure from the power steering pump. Sounds like the retaining ring went AWOL. I'm willing to bet it would be best to tear it down or replace it at least.

Raymo it's an extra unit so I'm not concerned about fixing it. I was more concerned about handling it safely once I read the "Caution High Pressure" stamping on it.  I'll just keep it as a core in case someone needs it.

Thanks

ED-NY

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Re: Hydroboost question
« Reply #5 on: January 03, 2016, 05:31:33 PM »
Just read that the 99 00 01 02 Chevy Silverado Avalanche GMC Sierra Yukon Hydro Boost Brake System uses a different brake pedal than a vacuum unit?

Anyone know if this applies to my 1994 cab that I just installed a hydroboost on? Haven't installed the calipers etc yet - but the stock vacuum brake pedal fit without a problem.

eBay link that caught my attention:

http://www.ebay.com/itm/99-00-01-02-Chevy-Silverado-Avalanche-GMC-Sierra-Yukon-Hydro-Boost-Brake-System-/351619742053?&_trksid=p2056016.l4276

RPF207

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Re: Hydroboost question
« Reply #6 on: January 03, 2016, 05:38:37 PM »
Hmmm. I can check tomorrow on my trucks. My HD and 93 half ton to compare. That shop that is selling that system is only 20 minutes from me here in Maine
1999 chevy HD 4x4 135.5" 6.5 nv4500 bw4470 Dana 70 HP 10 lug front

Due to recent budget cuts the light at the end of the tunnel has been turned off

ED-NY

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Re: Hydroboost question
« Reply #7 on: January 03, 2016, 05:41:16 PM »
Here's another auction from them:

http://www.ebay.com/itm/04-to-08-Chevy-Express-GMC-Savana-G20-G30-2500-3500-Hydro-Boost-Brake-Pedal-/272094256045?&_trksid=p2056016.l4276

I'll look at it again tomorrow...but it aligned up without a problem.  The cab I used is a 1994 K2500 with clutch pedal (on a 1995 3500HD chassis)..even the switches aligned perfectly.
« Last Edit: January 03, 2016, 05:43:49 PM by ED-NY »

someotherguy

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Re: Hydroboost question
« Reply #8 on: January 04, 2016, 09:41:38 AM »
It seems like the GMT400 trucks did use a different pedal when hydroboost-equipped.  It's been a while since I had all that stuff in front of me, though.  The difference is the arc in the pedal, which would change the amount of mechanical effort you can impart with it, I guess.  (not an engineer!)

Richard
06 Silverado ISS / 06 Silverado SS / 06 300C SRT8

ED-NY

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Re: Hydroboost question
« Reply #9 on: January 04, 2016, 06:47:09 PM »
It seems like the GMT400 trucks did use a different pedal when hydroboost-equipped.  It's been a while since I had all that stuff in front of me, though.  The difference is the arc in the pedal, which would change the amount of mechanical effort you can impart with it, I guess.  (not an engineer!)

Richard


Just studied it again tonight...the rod is level and a straight line forward, it has proper free play, brake switch functions.  Just can't see where it wouldn't work just fine.  Put a couple of street rods together with less alignment and they worked fine....hope I'm not missing something here.

The automatic cabs have a wider brake pedal so maybe because this cab is a manual (5 spd) cab with narrow brake pedal ...it fits fine?

 


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