Astro Hydroboost - What master cylinder? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**1971Stepside** · 10-01-2018, 05:34 PM

I have a 95 Astro van hydroboost and the Astro master cylinder. I would like to run a more modern looking master than the 71 cast iron one. I'm not sure what modern cylinders will work with both my boost and the disc/drum set up. I also assume I will have to use my original proportioning valve?? I don't want to spend the Willwood prices.

I did a search on the forum, but after an hour I found no definitive answer.

Any help is appreciated.

v30crewcab · 10-02-2018, 12:12 AM

I use the astro master as well as the prop valve. works good.

Bigdav160 · 10-02-2018, 05:53 AM

I used my original MC and valve. I only changed the vacuum booster with the hydraulic one (HB)

Keith Seymore · 10-02-2018, 07:33 AM

There are a million ways for a master cylinder to not be a good choice: bore diameter, quick take up vs non quick take up (affects the portion that goes into the booster), ISO flares vs US flare type, inboard ports vs outboard ports, front port goes to the rear system vs front port goes to the front system, to name a few.

Having said that I think the Astro hydroboost is a good choice.

K

**1971Stepside** · 10-02-2018, 09:09 AM

Quote:

I use the astro master as well as the prop valve. works good.

Are you running disc/drum and have had no issue using the prop valve and master from the Astro?

v30crewcab · 10-04-2018, 05:41 PM

I've run it both ways and it works. they are disc/drum in the astro so if thats what you are running it will be good.

**Slowguy** · 10-04-2018, 06:48 PM

Where’s the best place to get a complete Astro setup other than a pick and pull? If I search ebay all I find is just the hydroboost without the master cylinder.

**jeffahart** · 10-04-2018, 07:45 PM

Quote:

Originally Posted by Slowguy

Where’s the best place to get a complete Astro setup other than a pick and pull? If I search ebay all I find is just the hydroboost without the master cylinder.

You can get on the phone and call dismantlers. I thinks a lot of the stuff on ebay is dismantlers anyway.

j

MARKDTN · 10-05-2018, 08:54 AM

Quote:

Originally Posted by Slowguy

Where’s the best place to get a complete Astro setup other than a pick and pull? If I search ebay all I find is just the hydroboost without the master cylinder.

Auto parts store, craigslist, junkyard.....

**rustytruck50** · 10-06-2018, 10:26 PM

I'm interested in this swap. Does anybody have any pictures? Am I able to use my stock MC?

57taskforce · 10-07-2018, 12:13 AM

Quote:

Originally Posted by rustytruck50

I'm interested in this swap. Does anybody have any pictures? Am I able to use my stock MC?

Look at the last page in the link on my signature...

**rustytruck50** · 10-07-2018, 03:15 PM

Will do....thanks!

bs46488 · 10-08-2018, 01:05 PM

I've done 2 hydroboost setups.

1970 Nova - used the astro booster and MC for the Astro

1972 c10 - used a booster from an early 2000's silverado and the factory c10 booster

For both setups I used an aftermarket prop valve.

10-01-2018, 05:34 PM	#1
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,928	Astro Hydroboost - What master cylinder? I have a 95 Astro van hydroboost and the Astro master cylinder. I would like to run a more modern looking master than the 71 cast iron one. I'm not sure what modern cylinders will work with both my boost and the disc/drum set up. I also assume I will have to use my original proportioning valve?? I don't want to spend the Willwood prices. I did a search on the forum, but after an hour I found no definitive answer. Any help is appreciated. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

10-02-2018, 12:12 AM	#2
v30crewcab Registered User Join Date: Apr 2012 Location: Chatt Tn Posts: 957	Re: Astro Hydroboost - What master cylinder? I use the astro master as well as the prop valve. works good. __________________ 88 military v30 crewcab shortbed 5.9 cummins, nv4500, 205 86 k30, 89 diesel burb, 76 gmc pathfinder 71 longbed 5.3 4l80 http://67-72chevytrucks.com/vboard/s...d.php?t=522535

10-02-2018, 05:53 AM	#3
Bigdav160 Registered User Join Date: Apr 2011 Location: Klein Texas Posts: 3,852	Re: Astro Hydroboost - What master cylinder? I used my original MC and valve. I only changed the vacuum booster with the hydraulic one (HB) __________________ My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe

10-02-2018, 07:33 AM	#4
Keith Seymore Registered User Join Date: May 2009 Location: Motor City Posts: 9,147	Re: Astro Hydroboost - What master cylinder? There are a million ways for a master cylinder to not be a good choice: bore diameter, quick take up vs non quick take up (affects the portion that goes into the booster), ISO flares vs US flare type, inboard ports vs outboard ports, front port goes to the rear system vs front port goes to the front system, to name a few. Having said that I think the Astro hydroboost is a good choice. K __________________ Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/

10-04-2018, 05:41 PM	#6
v30crewcab Registered User Join Date: Apr 2012 Location: Chatt Tn Posts: 957	Re: Astro Hydroboost - What master cylinder? I've run it both ways and it works. they are disc/drum in the astro so if thats what you are running it will be good. __________________ 88 military v30 crewcab shortbed 5.9 cummins, nv4500, 205 86 k30, 89 diesel burb, 76 gmc pathfinder 71 longbed 5.3 4l80 http://67-72chevytrucks.com/vboard/s...d.php?t=522535

10-04-2018, 06:48 PM	#7
Slowguy Senior Member Join Date: Aug 2017 Location: Chicago,il Posts: 356	Re: Astro Hydroboost - What master cylinder? Where’s the best place to get a complete Astro setup other than a pick and pull? If I search ebay all I find is just the hydroboost without the master cylinder.

10-06-2018, 10:26 PM	#10
rustytruck50 Senior Member Join Date: Feb 2011 Location: Papillion, Ne Posts: 897	Re: Astro Hydroboost - What master cylinder? I'm interested in this swap. Does anybody have any pictures? Am I able to use my stock MC? __________________ -Doug '05 RCSB Sierra 2WD '71 Sierra 2WD Longbed '98 Silverado K1500 Xcab...sold '72 Highlander"Raymond"...sold

10-07-2018, 03:15 PM	#12
rustytruck50 Senior Member Join Date: Feb 2011 Location: Papillion, Ne Posts: 897	Re: Astro Hydroboost - What master cylinder? Will do....thanks! __________________ -Doug '05 RCSB Sierra 2WD '71 Sierra 2WD Longbed '98 Silverado K1500 Xcab...sold '72 Highlander"Raymond"...sold

10-08-2018, 01:05 PM	#13
bs46488 Registered User Join Date: May 2014 Location: San Diego, CA Posts: 547	Re: Astro Hydroboost - What master cylinder? I've done 2 hydroboost setups. 1970 Nova - used the astro booster and MC for the Astro 1972 c10 - used a booster from an early 2000's silverado and the factory c10 booster For both setups I used an aftermarket prop valve. __________________ Project Engine Stand 1972 SWB conversion: http://67-72chevytrucks.com/vboard/s...d.php?t=673914 1970 Nova: http://67-72chevytrucks.com/vboard/s...d.php?t=708161



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