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

cerial · 03-25-2019, 04:15 PM

I have a 87 which i am swaping in a 02 Silverado 5.3 and have 04 van hydroboost. I cut the firewall out of the 04 taking the boost and pedal pump and lines as a unit.

I am going to make some pedals maintaining the 04's ratio with a bell crank letting me go 90 and have a long rod pushing the hydroboost master which will be located behind the glove box.

Line wise can I eave the power steering pump in the 5.3's stock location on the drivers side with long lines feeding the hydroboost?

Or would i be better off moving the pump to the passenger side and have shorter lines feeding the hydroboost and longer lines going to the steering box?

Placing it on the passenger side allows for shorter high pressure line lengths. But if it is not going to matter much then I would perfer to keep the pump in the stock location not messing with the belt at all.

I dont have any extra steering boxes and should replace the one i am running now. Is there one I should run with that 04 pump/master or will one for a 87 be good.

**mongocanfly** · 03-25-2019, 06:52 PM

I kept my stock steering box on my 81and the 02 LS pump is just fine running it and the hydroboost...I'd keep it on the driver side...just to make it easier to plumb the steering box...the longer lines to the hydroboost wont matter

cerial · 03-25-2019, 11:40 PM

Thank you

mcmlxix · 07-19-2021, 08:07 AM

Can someone confirm the Hydro-Boost Lines:
HI input - FROM Power Steering Pump
HI Output - TO Power Steering Box
LO Output - RETURN to reservoir

Also, can someone confirm the Front Port on the master cylinder is for the front brake circuit and rear for rear?
I'm think it's logical but I want to make sure before I actually start bending hard lines....

I'm posting here in this group but swapping this setup into my 72 K5 using one ton axles and 4 wheel disc brakes ....

mcmlxix · 07-20-2021, 02:16 AM

Someone was nice enough to send me a link with some info … here are diagrams/photo if it helps anyone else....

**hatzie** · 07-20-2021, 07:14 PM

I don't believe the front and rear make any difference at all on a T800 disc/disc master cylinder.
The ABS controller takes care of brake bias on the T800. The 67-72 trucks used a combination valve to bias the brakes.

The stock 67-72 combination valve is setup to bias disc drum setups. Make sure your combination valve is setup for 4 wheel discs.

03-25-2019, 04:15 PM	#1
cerial Registered User Join Date: Mar 2014 Location: Ionia, MI Posts: 199	Hydroboost line question I have a 87 which i am swaping in a 02 Silverado 5.3 and have 04 van hydroboost. I cut the firewall out of the 04 taking the boost and pedal pump and lines as a unit. I am going to make some pedals maintaining the 04's ratio with a bell crank letting me go 90 and have a long rod pushing the hydroboost master which will be located behind the glove box. Line wise can I eave the power steering pump in the 5.3's stock location on the drivers side with long lines feeding the hydroboost? Or would i be better off moving the pump to the passenger side and have shorter lines feeding the hydroboost and longer lines going to the steering box? Placing it on the passenger side allows for shorter high pressure line lengths. But if it is not going to matter much then I would perfer to keep the pump in the stock location not messing with the belt at all. I dont have any extra steering boxes and should replace the one i am running now. Is there one I should run with that 04 pump/master or will one for a 87 be good. __________________ 1991 Metro commuter 1991 s10 future project truck 1987 V10 backup daily/junk truck 1985 K20 Winter beater 1991 R30(squarebody) c/c flatbed towrig 1994 s10 80"wb custom build

03-25-2019, 06:52 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,670	Re: Hydroboost line question I kept my stock steering box on my 81and the 02 LS pump is just fine running it and the hydroboost...I'd keep it on the driver side...just to make it easier to plumb the steering box...the longer lines to the hydroboost wont matter __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

03-25-2019, 11:40 PM	#3
cerial Registered User Join Date: Mar 2014 Location: Ionia, MI Posts: 199	Re: Hydroboost line question Thank you __________________ 1991 Metro commuter 1991 s10 future project truck 1987 V10 backup daily/junk truck 1985 K20 Winter beater 1991 R30(squarebody) c/c flatbed towrig 1994 s10 80"wb custom build

07-19-2021, 08:07 AM	#4
mcmlxix Collector of Projects Join Date: Apr 2003 Location: Las Vegas Posts: 3,106	Re: Hydroboost line question Can someone confirm the Hydro-Boost Lines: HI input - FROM Power Steering Pump HI Output - TO Power Steering Box LO Output - RETURN to reservoir Also, can someone confirm the Front Port on the master cylinder is for the front brake circuit and rear for rear? I'm think it's logical but I want to make sure before I actually start bending hard lines.... I'm posting here in this group but swapping this setup into my 72 K5 using one ton axles and 4 wheel disc brakes .... Attached Images __________________ Rich 1972 K5 Blazer CST Click HERE D60 BIG BRAKE UPGRADE Click HERE

07-20-2021, 02:16 AM	#5
mcmlxix Collector of Projects Join Date: Apr 2003 Location: Las Vegas Posts: 3,106	Re: Hydroboost line question Someone was nice enough to send me a link with some info … here are diagrams/photo if it helps anyone else.... Attached Images __________________ Rich 1972 K5 Blazer CST Click HERE D60 BIG BRAKE UPGRADE Click HERE

07-20-2021, 07:14 PM	#6
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Hydroboost line question I don't believe the front and rear make any difference at all on a T800 disc/disc master cylinder. The ABS controller takes care of brake bias on the T800. The 67-72 trucks used a combination valve to bias the brakes. The stock 67-72 combination valve is setup to bias disc drum setups. Make sure your combination valve is setup for 4 wheel discs. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

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