Hydro Boost Push Rod - The 1947 - Present Chevrolet & GMC Truck Message Board Network

6600DURAMAX · 04-30-2009, 09:55 PM

Installing my hydro boost setup and the rod that goes from the brake pedal to the unit has threads on one end that I can attached to the factory threaded end but the other end is just rounded and goes into the back of teh hydroboost unit a little. It has no way to attach it. Is this normal. I was at first worried it could come out but after careful examination if it is in there tight (like it should be) the brake pedal cannot come back far enough for it ever to fall out so I guess it will be fine like this??

Also is there anything special I need to do to properly bleed this system, everything is new, ps gear box, hydroboost, m/c prop valve, all lines etc..

thanks guys

6600DURAMAX · 04-30-2009, 10:37 PM

Anyone have anything before I hit the sack?

68gmsee · 04-30-2009, 10:45 PM

Are you referring to this pushrod?

68gmsee · 04-30-2009, 10:52 PM

I'm assuming you mean you installed a power brake booster, master cylinder, etc.. No special method to bleed the brakes.

The master cylinder, if it's new requires special bleeding to insure there's no residual air in there but if it has been done already just start with the rear passendger side and then drivers side rear.

Then do the front passenger and then drivers side.

If you don't have a special bleeding kit, you will need two people. One depressing the pedal, another loosening and tightening the bleeding screws.

6600DURAMAX · 04-30-2009, 11:00 PM

Here is a pic of the rod, the one end threads into the factory piece ( I am actually welding it in since it is the wrong thread size) but it is the other side that just "rides" in the booster. Is that OK???

6600DURAMAX · 05-01-2009, 07:45 AM

Anyone?

68gmsee · 05-01-2009, 08:57 AM

My booster push rod looks different than that one.

68gmsee · 05-01-2009, 09:19 AM

Okay, I was looking at the wrong. Some of these power vacuum boosters are different on some of these trucks. Mine was converted.

Here's a picture schematic. It's a "push fit" piece but there's a retainer on the inside that lets you force the poppet in to hold it in place.

fastom · 05-01-2009, 11:27 AM

He's working with a "Hydro Boost" system. I have one on my truck but I didn't notice if the rod came out of the system or not.

6600DURAMAX · 05-03-2009, 06:33 PM

I am just going to double nut the nuts and call it good. I really dont think it could ever come out.

04-30-2009, 09:55 PM	#1
6600DURAMAX Registered User Join Date: Nov 2000 Location: Wheatfield IN, USA Posts: 1,124	Hydro Boost Push Rod Installing my hydro boost setup and the rod that goes from the brake pedal to the unit has threads on one end that I can attached to the factory threaded end but the other end is just rounded and goes into the back of teh hydroboost unit a little. It has no way to attach it. Is this normal. I was at first worried it could come out but after careful examination if it is in there tight (like it should be) the brake pedal cannot come back far enough for it ever to fall out so I guess it will be fine like this?? Also is there anything special I need to do to properly bleed this system, everything is new, ps gear box, hydroboost, m/c prop valve, all lines etc.. thanks guys __________________ 1972 K5 - LS3/408 (595Hp) -6L80e-One Tons with 4.56, 20'' Beadlocks with 37'' rubber, full TMI interior, JL Audio ..... 1971 CREWMAX Build.....at body shop for couple more years

04-30-2009, 10:37 PM	#2
6600DURAMAX Registered User Join Date: Nov 2000 Location: Wheatfield IN, USA Posts: 1,124	Re: Hydro Boost Push Rod Anyone have anything before I hit the sack? __________________ 1972 K5 - LS3/408 (595Hp) -6L80e-One Tons with 4.56, 20'' Beadlocks with 37'' rubber, full TMI interior, JL Audio ..... 1971 CREWMAX Build.....at body shop for couple more years

04-30-2009, 10:45 PM	#3
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Hydro Boost Push Rod Are you referring to this pushrod? Attached Images

04-30-2009, 10:52 PM	#4
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Hydro Boost Push Rod I'm assuming you mean you installed a power brake booster, master cylinder, etc.. No special method to bleed the brakes. The master cylinder, if it's new requires special bleeding to insure there's no residual air in there but if it has been done already just start with the rear passendger side and then drivers side rear. Then do the front passenger and then drivers side. If you don't have a special bleeding kit, you will need two people. One depressing the pedal, another loosening and tightening the bleeding screws. Last edited by 68gmsee; 04-30-2009 at 10:53 PM.

04-30-2009, 11:00 PM	#5
6600DURAMAX Registered User Join Date: Nov 2000 Location: Wheatfield IN, USA Posts: 1,124	Re: Hydro Boost Push Rod Here is a pic of the rod, the one end threads into the factory piece ( I am actually welding it in since it is the wrong thread size) but it is the other side that just "rides" in the booster. Is that OK??? Attached Images __________________ 1972 K5 - LS3/408 (595Hp) -6L80e-One Tons with 4.56, 20'' Beadlocks with 37'' rubber, full TMI interior, JL Audio ..... 1971 CREWMAX Build.....at body shop for couple more years

05-01-2009, 07:45 AM	#6
6600DURAMAX Registered User Join Date: Nov 2000 Location: Wheatfield IN, USA Posts: 1,124	Re: Hydro Boost Push Rod Anyone? __________________ 1972 K5 - LS3/408 (595Hp) -6L80e-One Tons with 4.56, 20'' Beadlocks with 37'' rubber, full TMI interior, JL Audio ..... 1971 CREWMAX Build.....at body shop for couple more years

05-01-2009, 08:57 AM	#7
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Hydro Boost Push Rod My booster push rod looks different than that one.

05-01-2009, 09:19 AM	#8
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Hydro Boost Push Rod Okay, I was looking at the wrong. Some of these power vacuum boosters are different on some of these trucks. Mine was converted. Here's a picture schematic. It's a "push fit" piece but there's a retainer on the inside that lets you force the poppet in to hold it in place. Attached Images

05-01-2009, 11:27 AM	#9
fastom That's right, it's Copper!! Join Date: May 2007 Location: Bakersfield, Central California Posts: 558	Re: Hydro Boost Push Rod He's working with a "Hydro Boost" system. I have one on my truck but I didn't notice if the rod came out of the system or not. __________________ Tom: 1968 Chevy SWB ZZ383 W/700R4 Gen-II Compact Vintage Air System PPG paint, Mandarin Copper and Vanilla Shake. http://www.hubgarage.com/mygarage/fastom Stupid should hurt and eventually become fatal!

05-03-2009, 06:33 PM	#10
6600DURAMAX Registered User Join Date: Nov 2000 Location: Wheatfield IN, USA Posts: 1,124	Re: Hydro Boost Push Rod I am just going to double nut the nuts and call it good. I really dont think it could ever come out. __________________ 1972 K5 - LS3/408 (595Hp) -6L80e-One Tons with 4.56, 20'' Beadlocks with 37'' rubber, full TMI interior, JL Audio ..... 1971 CREWMAX Build.....at body shop for couple more years

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