A little help with hydroboost on my 1 ton - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**57NAPCO** · 09-21-2011, 02:34 AM

Never worked on a system like the hydroboost on my 1976 GMC dually. The pedal went to the floor yesterday and the master cylinder was real low. I'm guessing the MC failed, I looked underneath for signs of a blown wheel cylinder/caliper but saw no signs of fluid. Is the system easy to work on? I want to fix it right, the first time...
Thanks
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rcbildr · 09-21-2011, 04:04 AM

Replacing just the master cylinder on a hydroboost is no different than on a vacuum boost system...bench bleed it well and then bleed the system like you normally would after install. Just be sure to specify you need a MC for a hydroboost truck.

**57NAPCO** · 09-21-2011, 08:16 AM

Thanks for the info! Does the hydroboost contraption ever go out?
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79k30dually · 09-21-2011, 07:09 PM

I've been running them and working at dealerships for years and maybe replaced 2 units. Good luck, Ron.

**57NAPCO** · 09-21-2011, 08:37 PM

Ron, are you saying it's prolly just a master cylinder?
Thanks
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09-21-2011, 02:34 AM	#1
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,218	A little help with hydroboost on my 1 ton Never worked on a system like the hydroboost on my 1976 GMC dually. The pedal went to the floor yesterday and the master cylinder was real low. I'm guessing the MC failed, I looked underneath for signs of a blown wheel cylinder/caliper but saw no signs of fluid. Is the system easy to work on? I want to fix it right, the first time... Thanks Posted via Mobile Device

09-21-2011, 04:04 AM	#2
rcbildr Registered User Join Date: Sep 2000 Location: Gold Bar, WA Posts: 1,216	Re: A little help with hydroboost on my 1 ton Replacing just the master cylinder on a hydroboost is no different than on a vacuum boost system...bench bleed it well and then bleed the system like you normally would after install. Just be sure to specify you need a MC for a hydroboost truck. __________________ My Projects: 1960 GMC 1/2ton with 305 V6 (daily driver) 1963 Chevy 1/2ton 2wd...converting to 4x4 1967 Suburban 1/2ton 2wd My Girlfriends Projects 1985 Chevy Suburban 3/4ton 4x4 with 6.2L diesel, 4" lift, converted to TH-400, Warn Premium manual hubs, & Wildcat 315/75/R16 tires. (daily driver) 1978 Camaro Type LT with a Marine 350 & vortec heads, Rochester Carb, & roller cam 1978 Camaro Z28

09-21-2011, 08:16 AM	#3
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,218	Re: A little help with hydroboost on my 1 ton Thanks for the info! Does the hydroboost contraption ever go out? Posted via Mobile Device

09-21-2011, 07:09 PM	#4
79k30dually Registered User Join Date: Aug 2011 Location: Newark Ohio Posts: 122	Re: A little help with hydroboost on my 1 ton I've been running them and working at dealerships for years and maybe replaced 2 units. Good luck, Ron.

09-21-2011, 08:37 PM	#5
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,218	Re: A little help with hydroboost on my 1 ton Ron, are you saying it's prolly just a master cylinder? Thanks Posted via Mobile Device



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