Weird hydroboost question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BigSix · 08-09-2015, 03:36 PM

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)?

Twisted78SS · 08-09-2015, 07:25 PM

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

BigSix · 08-09-2015, 09:16 PM

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

Ozzy2013 · 08-09-2015, 09:57 PM

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!

**Captainfab** · 08-10-2015, 01:10 AM

So what master cylinder are you trying to bolt up to the hydroboost that isn't working correctly?

BigSix · 08-10-2015, 08:34 AM

Quote:

Originally Posted by Captainfab

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.

Ozzy2013 · 08-10-2015, 01:33 PM

Im talking about the pedal and hydroboost side you take the two join them the length you need and weld them together.

**Captainfab** · 08-11-2015, 12:43 AM

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

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.

BigSix · 08-10-2015, 08:33 AM

Quote:

Originally Posted by Ozzy2013

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.

BR3W CITY · 08-11-2015, 12:20 AM

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

**LostMy65** · 09-15-2015, 06:09 PM

Some have made the intermediate pushrod out of a bolt shank.

BigSix · 09-30-2015, 02:37 PM

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?

**Captainfab** · 09-30-2015, 10:59 PM

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..

BigSix · 09-30-2015, 11:04 PM

Thanks Cap'n

BigSix · 10-01-2015, 11:53 AM

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?

**Captainfab** · 10-02-2015, 01:21 AM

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.

BigSix · 10-02-2015, 11:44 AM

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

08-09-2015, 03:36 PM	#1
BigSix Registered User Join Date: Mar 2014 Location: MD/VA/PA Or Inbetween Posts: 413	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)?

08-09-2015, 07:25 PM	#2
Twisted78SS Wide n'Low Join Date: Jan 2007 Location: La Center, WA Posts: 1,511	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 __________________ Trippin Hazard.. 67 swb, Gold Member.. 68 Suburban Air Force Retired

08-09-2015, 09:16 PM	#3
BigSix Registered User Join Date: Mar 2014 Location: MD/VA/PA Or Inbetween Posts: 413	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

08-09-2015, 09:57 PM	#4
Ozzy2013 Registered User Join Date: Oct 2013 Location: Elkton Posts: 693	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!

08-10-2015, 01:10 AM	#5
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: Weird hydroboost question So what master cylinder are you trying to bolt up to the hydroboost that isn't working correctly? __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

08-10-2015, 01:33 PM	#7
Ozzy2013 Registered User Join Date: Oct 2013 Location: Elkton Posts: 693	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.

08-11-2015, 12:20 AM	#10
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Weird hydroboost question I just cut the adjustable end off and welded it onto the correct shaft. It took all of 7 minutes. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

09-15-2015, 06:09 PM	#11
LostMy65 But Found Her 25yrs Later! Join Date: Oct 2010 Location: Oregon City, Oregon Posts: 10,525	Re: Weird hydroboost question Some have made the intermediate pushrod out of a bolt shank. __________________ I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035

09-30-2015, 02:37 PM	#12
BigSix Registered User Join Date: Mar 2014 Location: MD/VA/PA Or Inbetween Posts: 413	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?

09-30-2015, 10:59 PM	#13
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	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.. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

09-30-2015, 11:04 PM	#14
BigSix Registered User Join Date: Mar 2014 Location: MD/VA/PA Or Inbetween Posts: 413	Re: Weird hydroboost question Thanks Cap'n

10-01-2015, 11:53 AM	#15
BigSix Registered User Join Date: Mar 2014 Location: MD/VA/PA Or Inbetween Posts: 413	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?

10-02-2015, 01:21 AM	#16
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	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. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

10-02-2015, 11:44 AM	#17
BigSix Registered User Join Date: Mar 2014 Location: MD/VA/PA Or Inbetween Posts: 413	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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