Hydroboost Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

harrdawg54 · 10-29-2008, 09:55 PM

I just replaced my power brake mastercylinder and booster with a hydroboost mastercylinder from an '83 chevy 1ton truck. the rod was about 1/4 inch shorter than the original one. My question is, am I going to have a problem or is this setup fine?

Spray-Bomb · 10-30-2008, 12:02 AM

Im not 100% sure, but I would think you would need to extend the rod

dwcsr · 10-30-2008, 01:55 AM

Where is it a 1/4 short? pedal to booster or booster to master? If its pedal to booster I wouldn't worry. If its booster to master you need to fix it. Look at this

http://www.thehollisterroadcompany.com/hydroboost.html

Mid way down and at the end should give you an idea of what you need to do.

beater69 · 10-30-2008, 02:27 AM

I did the same swap and had the same problem. I cut the rod in half and threaded both ends. I believe it was 7/16 diameter. Then I connected the two with a coupler nut and adjusted the length and locked it all in place with jam nuts. Hope that makes sense. I could get some pics if you need them, I'm just feeling a little lazy...it is 11:30 :-)

harrdawg54 · 10-30-2008, 04:52 PM

The rod is shorter from the mastercylinder to the pedal, there is no longer a booster. I can push the pedal all the way to the floor, but I have not hooked everything up so there is no pressure. I just didn't know if the 1/4 inch would be a big deal. beater69, pics would be great if you have any. Thanks

Senator350 · 10-30-2008, 06:09 PM

ummm. you do tooo have a booster. it's just hydraulic.
the biggest concern is play in the pedal when the pushrod is all the way extended. you can maybe adjust your pedal stop to the new shorter pushrod length? do our brake pedal assemblies even HAVE stops? i hate it when posts make me want to go out in the cold and climb around in my truck!!!

beater69 · 10-31-2008, 01:59 AM

Ideally you would thread one side LH tread and the other RH. but I just threaded both sides the same and adjusted the length before I bolted the rod onto the brake pedal. I soaked everything in loctite to just for good measure

Hope this helps. You should check out yukon jacks write up too. I was going to do it the same way he did his but I could find a clevis rod end. Oh well...
Here's a link to his page http://yukon.b0xen.us/hydraulicclutch.html

10-29-2008, 09:55 PM	#1
harrdawg54 Registered User Join Date: Apr 2007 Location: Sandpoint, Idaho Posts: 178	Hydroboost Question I just replaced my power brake mastercylinder and booster with a hydroboost mastercylinder from an '83 chevy 1ton truck. the rod was about 1/4 inch shorter than the original one. My question is, am I going to have a problem or is this setup fine? __________________ 1969 Chevy K20 Custom Camper 350, 4sp, 33's High on plans, Low on funds

10-30-2008, 12:02 AM	#2
Spray-Bomb Texas Big Wig Join Date: Jan 2007 Location: Mineola, Texas Posts: 5,620	Re: Hydroboost Question Im not 100% sure, but I would think you would need to extend the rod __________________ Just not low enough... ----------------------------- Sinister Killer

10-30-2008, 01:55 AM	#3
dwcsr Hollister Road Co. Join Date: Apr 2005 Location: Houston Posts: 6,134	Re: Hydroboost Question Where is it a 1/4 short? pedal to booster or booster to master? If its pedal to booster I wouldn't worry. If its booster to master you need to fix it. Look at this http://www.thehollisterroadcompany.com/hydroboost.html Mid way down and at the end should give you an idea of what you need to do. Last edited by dwcsr; 10-30-2008 at 01:55 AM.

10-30-2008, 02:27 AM	#4
beater69 Sinister Exaggerator Join Date: Feb 2006 Location: Eugene, Oregon Posts: 111	Re: Hydroboost Question I did the same swap and had the same problem. I cut the rod in half and threaded both ends. I believe it was 7/16 diameter. Then I connected the two with a coupler nut and adjusted the length and locked it all in place with jam nuts. Hope that makes sense. I could get some pics if you need them, I'm just feeling a little lazy...it is 11:30 :-) __________________ 69 c10 Chevy Long Fleet 350/350 under construction Poor man's disc brake upgrade with HydroBoost from '82 diesel Blazer tank with "John Fabris" stake pocket filler (Genius!)

10-30-2008, 04:52 PM	#5
harrdawg54 Registered User Join Date: Apr 2007 Location: Sandpoint, Idaho Posts: 178	Re: Hydroboost Question The rod is shorter from the mastercylinder to the pedal, there is no longer a booster. I can push the pedal all the way to the floor, but I have not hooked everything up so there is no pressure. I just didn't know if the 1/4 inch would be a big deal. beater69, pics would be great if you have any. Thanks __________________ 1969 Chevy K20 Custom Camper 350, 4sp, 33's High on plans, Low on funds Last edited by harrdawg54; 10-30-2008 at 04:53 PM.

10-30-2008, 06:09 PM	#6
Senator350 Registered User Join Date: Feb 2004 Location: Albany, NY Posts: 522	Re: Hydroboost Question ummm. you do tooo have a booster. it's just hydraulic. the biggest concern is play in the pedal when the pushrod is all the way extended. you can maybe adjust your pedal stop to the new shorter pushrod length? do our brake pedal assemblies even HAVE stops? i hate it when posts make me want to go out in the cold and climb around in my truck!!! __________________ RN U OVR

10-31-2008, 01:59 AM	#7
beater69 Sinister Exaggerator Join Date: Feb 2006 Location: Eugene, Oregon Posts: 111	Re: Hydroboost Question Ideally you would thread one side LH tread and the other RH. but I just threaded both sides the same and adjusted the length before I bolted the rod onto the brake pedal. I soaked everything in loctite to just for good measure Hope this helps. You should check out yukon jacks write up too. I was going to do it the same way he did his but I could find a clevis rod end. Oh well... Here's a link to his page http://yukon.b0xen.us/hydraulicclutch.html Attached Images __________________ 69 c10 Chevy Long Fleet 350/350 under construction Poor man's disc brake upgrade with HydroBoost from '82 diesel Blazer tank with "John Fabris" stake pocket filler (Genius!)



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