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Old 08-09-2015, 03:36 PM   #1
BigSix
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Weird hydroboost question

So I got the astro van hydroboost on the firewall captain fab bracket. The pushrod that the hydroboost pushes against the master cylinder is not adjustable. I yanked it out and tried to install my adjustable one...no go it won't clip in. So I gently tapped the stock pushrod back in. So what are my options in terms of adjustable push rods AND/OR a different master (that is all metal not plastic)?
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Old 08-09-2015, 07:25 PM   #2
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Re: Weird hydroboost question

Curious as well
Just getting to mine in the next week
I did gather a bunch of info but can't access it until tomorrow. I'll post what I have then
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Old 08-09-2015, 09:16 PM   #3
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Re: Weird hydroboost question

Thanks - would be good to have an option for drum/drum and disk/drum and disk/disk just so it can be pulled up for others in the future. Really hoping I don't have to run the factory 94 Astro van booster
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Old 08-09-2015, 09:57 PM   #4
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Re: Weird hydroboost question

I took the half from a stock MC vacuum booster it unscrews in the middle .You then thread the hydro boost one to match.I didn't have that luxury helper lost the stock one so i cut the hydro-boost one and another one i found that matched the pedal hole and welded them together the length i needed.Bevel the ends fill them with weld grind down if preferred and it will look stock!
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Old 08-10-2015, 01:10 AM   #5
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Re: Weird hydroboost question

So what master cylinder are you trying to bolt up to the hydroboost that isn't working correctly?
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Old 08-10-2015, 08:34 AM   #6
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Re: Weird hydroboost question

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Originally Posted by Captainfab View Post
So what master cylinder are you trying to bolt up to the hydroboost that isn't working correctly?
Right now I am drum/drum and have a 69 master but I should be getting a disk front and so really any master that is disk/drum and not all plastic would be good. Any suggestions for drum/drum in case my front disk doesn't happen would be good too.
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Old 08-10-2015, 01:33 PM   #7
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Re: Weird hydroboost question

Im talking about the pedal and hydroboost side you take the two join them the length you need and weld them together.
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Old 08-11-2015, 12:43 AM   #8
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Re: Weird hydroboost question

A '67-'70 drum/drum master cylinder requires the 'long' intermediate pushrod. A '71 and up C10, 20 or 30 master cylinder should require a short intermediate pushrod. I do know that in '79 a C10 was available with a diesel and a hydroboost. That would be a cast iron master cylinder.

All C/K 30's will have hydroboost brakes, but the master cylinder will have a bit bigger bore than a C10 will. This may make your brakes too touchy.

Quote:
Originally Posted by BigSix View Post
Right now I am drum/drum and have a 69 master but I should be getting a disk front and so really any master that is disk/drum and not all plastic would be good. Any suggestions for drum/drum in case my front disk doesn't happen would be good too.
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Last edited by Captainfab; 08-11-2015 at 12:50 AM.
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Old 08-10-2015, 08:33 AM   #9
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Re: Weird hydroboost question

Quote:
Originally Posted by Ozzy2013 View Post
I took the half from a stock MC vacuum booster it unscrews in the middle .You then thread the hydro boost one to match.I didn't have that luxury helper lost the stock one so i cut the hydro-boost one and another one i found that matched the pedal hole and welded them together the length i needed.Bevel the ends fill them with weld grind down if preferred and it will look stock!
I believe you are talking about the pedal side and I need the MC side.
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Old 08-11-2015, 12:20 AM   #10
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Re: Weird hydroboost question

I just cut the adjustable end off and welded it onto the correct shaft. It took all of 7 minutes.




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Old 09-15-2015, 06:09 PM   #11
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Re: Weird hydroboost question

Some have made the intermediate pushrod out of a bolt shank.
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Old 09-30-2015, 02:37 PM   #12
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Re: Weird hydroboost question

Oh and I assume I want the master from a 71 C10 with power brakes and not bendix brakes? Any particular proportioning valve to use with this master?
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Old 09-30-2015, 10:59 PM   #13
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Re: Weird hydroboost question

Yes a '71 master cylinder should work with that hydroboost. Any disc/drum proportioning valve will work. Use the one for the '71 if you have it..
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Old 09-30-2015, 11:04 PM   #14
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Re: Weird hydroboost question

Thanks Cap'n
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Old 10-01-2015, 11:53 AM   #15
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Re: Weird hydroboost question

Promise last question: Rockauto has this master without a core charge but I don't know if its for power or manual brakes. Any input? Some 71 C10 masters say bendix brakes and others moraine - which one is what I need though?
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Old 10-02-2015, 01:21 AM   #16
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Re: Weird hydroboost question

I'm not sure of the difference between a Bendix booster and a Morraine booster. I'm thinking there may be a difference in the intermediate pushrod. I would have to check into it.
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Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE
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Old 10-02-2015, 11:44 AM   #17
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Re: Weird hydroboost question

Thanks - yeah I just want to order the master and can't really find any information as to which will work with my intermediate rod. Please let me know as soon as you have anything so I can get this bad boy plumbed up. Thanks again cap'n
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