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#1 |
Registered User
Join Date: Sep 2012
Location: gold coast
Posts: 40
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can some on identify this ??
Can some one identify this and what it does please
![]() ok the truck is a canada import right hand drive, body tag says 1981 into Australia by GM-H (general motors Holden) c30, 350, truck 4 speed, dually, lwb this cannister looking thing is mounted on the right front inner gaurd, it has a brake line coming from the rear of the master cylinder into the side of it and exiting the other side of it Im asuming going off to the front brakes. at the back of the cannister thingy is a cable going off to the dash, the cable is hand operated like say... a choke cable. it has two vac hoses one (the one with red tape) goes off to the back of the truck and lopes around up to the front left inner gaurd to some kind of valve looking thing on the left inner gaurd, the other vac hose goes across the radiator to what looks like a vac tank on the other left inner gaurd. this same vac tank has a hose coming from the intake manifold to provide the vacume. hers a pic of the vac tank ![]() now... I cant think why it would have anything to do with the brakes because the brakes are fuild boosted from the power steer pump ![]() the brakes in the truck work flawless, but the cannister thingy is leaking brake fluid.. what is it and whats it for??? Last edited by C30trailerspecial; 10-05-2012 at 07:34 PM. |
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#2 |
Registered User
Join Date: Jul 2012
Location: Salt Lake City
Posts: 59
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Re: can some on identify this ??
Cruise control I imagine.
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#3 |
Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: can some on identify this ??
Vacuum trailer brakes, Only good for trailers with vacuum over hydraulic brakes.
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#4 |
Registered User
Join Date: Mar 2000
Location: Lake Jackson, TX.
Posts: 1,930
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Re: can some on identify this ??
The brakes are HYDROBOOST. they are used for Diesel engines because the don't make vacuum. The POWER STEERING PUMP feeds the HYDROLICS for the brakes.
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2004 Silverado Crewcab (Dark Spiral Gray) |
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#5 | |
Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: can some on identify this ??
Quote:
Very common back when people pulled heavy loads with gas powered engines. Ive seen quite a few on older large (triple axle) Race & Horse/Livestock trailers. Trailer brake types.... Surge over hydraulic. Electric over hydraulic. Air over hydraulic. Vacuum over hydraulic. Electric brake. Air brake. |
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#6 | |
Registered User
Join Date: Sep 2012
Location: gold coast
Posts: 40
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Re: can some on identify this ??
Quote:
Last edited by C30trailerspecial; 10-05-2012 at 10:26 PM. |
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#7 | |
Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: can some on identify this ??
Quote:
![]() Low/no vacuum....trailer brakes applied. High vacuum....trailer brakes released. Vacuum inbetween is modulated by the contoller via input. |
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#8 |
Registered User
Join Date: Sep 2012
Location: gold coast
Posts: 40
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Re: can some on identify this ??
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#9 |
Registered User
Join Date: Mar 2000
Location: Lake Jackson, TX.
Posts: 1,930
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Re: can some on identify this ??
I was referring to the last picture. That is a HYDROBOOST SYSTEM, looks just like mine, however my 82 was previously diesel. I am going to remove the HYDROBOOST and put a regular booster on it. I did notice something, THAT BOOSTER SET UP IS ON THE WRONG SIDE (LOL), maybe that's the problem, it's on the wrong side :-)
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2004 Silverado Crewcab (Dark Spiral Gray) |
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#10 |
Registered User
Join Date: Sep 2012
Location: gold coast
Posts: 40
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Re: can some on identify this ??
clearly you didnt read my opening post.
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#11 |
Registered User
Join Date: Dec 2010
Location: Pittsburgh, PA
Posts: 1,009
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Re: can some on identify this ??
Clearly he was joking.
Anyway, it's cool to see a right hand drive rig. As long as you're not hauling anything that uses that specific style of trailer brakes, I would go ahead and bypass it for now. I would advise, however, keeping the hydroboost brakes. They tend to be a little stronger than the typical vacuum power brake systems. Best of luck with the truck!
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Steve Member of the Foot Pedal Club '83 Chevy K20: 6" Rough Country, 3" Performance Accessories BL, Bushwacker Cutouts, 38x15.50 Mickey Thompson Baja Claws, 350 HP 350 crate engine from Jegs, Turbo 400 ![]() |
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#12 |
Registered User
Join Date: Jan 2011
Location: Tulsa,Okla
Posts: 590
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Re: can some on identify this ??
Since stuff is backwards, where is the heater? Just curious, I don't see it.
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"Whoever said money can't buy happiness has obviously never seen a speed shop! |
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#13 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: can some on identify this ??
I would trade a perfect truck for your Aussie truck lol
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#14 |
Registered User
Join Date: Sep 2012
Location: gold coast
Posts: 40
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Re: can some on identify this ??
the heater is there, the water pipes exit just above and to the left of the dissy.
and yes Im keeping the hydoboost brakes, they work so well, |
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