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CorvettesHydraboost
Brakes

flynhi
Senior
Member

1782
posts [100%]
Austin TX

Hydraboost
Brakes

6:31
AM 6/13/2002

In the recent steeroids rack and pinion thread,
Norval mentions hydraboost brakes. What the heck is
that?
_______

"Every true and precious thing worth
having stands on the razor's edge of being lost and must be
fought for"
71 Black on red Conv, Lingenfelter 383, 44mm
runner tpi, 52mm TB, 24# injectors,custom chip,409 BHP, 509
BTRQ, Muncie 4sp, 3.55, coated headers, mandrel pipes w/ x
crossover, 1 1/8 front, 5/8 rear stabar, fiberglass springs
front and rear, Bilsteins, 80 seats

Jim Shea
Senior
Member

996 posts [100%]
Saginaw, MI

Re: Hydraboost
Brakes (flynhi)

6:48
AM 6/13/2002

Hydraboost brakes are hydraulic assisted power
brakes. The unit bolts right in place of the vacuum booster
can. The hydraboost unit uses the power steering system to
supply hydraulic pressure to provide assist.

The unit is plumbed in series with the power steering gear
(or in case of the Corvette, in series with the control
valve). The unit was developed to be used with diesel engines
(which can't provide engine vacuum). Also early emission
systems caused the engine to run so poorly that there wasn't a
consistant supply of vacuum. It also was used to provide
better braking to meet federal standards. You still find the
hydraboost unit on a lot of pickup trucks.

The reason some of the C3 people are interested in the unit
is that it is much more compact than the vacuum booster.
Therefore, you can pick up clearance to big block valve
covers, etc.
_______

1975, 7-Up Green, L82, 4 Speed, 2 Top Roadster,
w/AC
[email-masked]

paso
Senior
Member

1069
posts [100%]
Saskatoon Saskatchewan Canada

Re: Hydraboost
Brakes (Jim Shea)

7:05
AM 6/13/2002

Great summation Jim All in one complete nut shell. Good
job.
_______

http://vettefinders.com/77registry/

norvalwilhelm
Senior
Member

1775
posts [100%]
Waterloo ontario Canada

Re: Hydraboost
Brakes (flynhi)

7:07
AM 6/13/2002

My last unit came off a 94 one ton dually
truck. If it can stop a 10,000 lb loaded truck think what it
can do to a 3500 lb corvette. The unit is cheap used $50 CDN
complete, super compact and easy to install. It looks like it
was made for the older corvettes.
I can match breaking
power with anyone on this forum. Might not stop as quick but
for shear lockup power it is
unbeatable.
_______

Norval

flynhi
Senior
Member

1782
posts [100%]
Austin TX

Re: Hydraboost
Brakes (norvalwilhelm)

7:59
AM 6/13/2002

So, if I have good vacuum for my vacuum
booster, there is no advantage to making a
change?
_______

"Every true and precious thing worth
having stands on the razor's edge of being lost and must be
fought for"
71 Black on red Conv, Lingenfelter 383, 44mm
runner tpi, 52mm TB, 24# injectors,custom chip,409 BHP, 509
BTRQ, Muncie 4sp, 3.55, coated headers, mandrel pipes w/ x
crossover, 1 1/8 front, 5/8 rear stabar, fiberglass springs
front and rear, Bilsteins, 80 seats

norvalwilhelm
Senior
Member

1775
posts [100%]
Waterloo ontario Canada

Re: Hydraboost
Brakes (flynhi)

8:53
AM 6/13/2002

So, if I have good vacuum for my vacuum
booster, there is no advantage to making a change?
_______

I run a stud girdle on my bigblock so I need tall valve
covers. I would not have room with a normal brake booster to
fit the tall covers. Even the new 7 or 8 inch dual diaghram
boosters would not fit plus the cost of a vacuum brake booster
could not begin to compare to this $50 solution. Also a vacuum
unit does not have the power of the hydraboost. It is mainly
used for large diesel trucks or work vans so it is designed to
stop alot more weight then your car

_______

Norval

MIKER
Senior
Member

999 posts [100%]
Tolar, Texas

Re: Hydraboost
Brakes (norvalwilhelm)

9:00
AM 6/13/2002

My brakes work good but I would still like to
do this conversion. When it comes to GO or STOP, the more the
merrier!
Besides, power brake vacuum boosters are NOT
exactly the most attractive thing under the hood
either.
_______

1980 black on black,
388/700R4/3.73

flynhi
Senior
Member

1782
posts [100%]
Austin TX

Re: Hydraboost
Brakes (norvalwilhelm)

9:40
AM 6/13/2002

Norval, Do you have a source and a part
number?
Thanks,Will
_______

"Every true and
precious thing worth having stands on the razor's edge of
being lost and must be fought for"
71 Black on red Conv,
Lingenfelter 383, 44mm runner tpi, 52mm TB, 24#
injectors,custom chip,409 BHP, 509 BTRQ, Muncie 4sp, 3.55,
coated headers, mandrel pipes w/ x crossover, 1 1/8 front, 5/8
rear stabar, fiberglass springs front and rear, Bilsteins, 80
seats

norvalwilhelm
Senior
Member

1775
posts [100%]
Waterloo ontario Canada

Re: Hydraboost
Brakes (flynhi)

9:55
AM 6/13/2002

I don't have a part number. I do have a source.
Country Choice, a wrecking yard near here but definitely out
for most people. These units are the same . I bought 2 a 83
half ton van and a 94 one ton and both look identical but the
internal piston bore is bigger on the one ton. These units are
like $800 new, $300 rebuilt and in the wreckers $50 here more
like $100 in the lower states. I asked the owner why so cheap
and he said you are my only customer for them. They never go
bad and I will never be able to sell them. He could have
charged me more but he is honest.
These units beat a vacuum
system in power, compactness and price. My manual brakes were
a constant source of embarrassement when I let others test
drive my car and I do loan it out for test drives. Now I don't
have to worry about anyone thinking my brakes are weak.
If
you have a wild cam, tall valve covers or just need the extra
space these units are the
answer.
_______

Norval

Gordonm
Senior
Member

2354 posts [100%]
Marlton NJ

Re: Hydraboost
Brakes (norvalwilhelm)

10:14
AM 6/13/2002

Do you have any pictures of this install. I
have thought of this system many times but a picture would be
nice. Thanks
_______

72 Red LT1 Convertible. AFR 190
heads, Hooker Headers Jet Hot Coated, custom 2 1/2 exhaust
with 50 Series Delta Flow Flowmasters, Comp Cams 294S, Crane
HI6 Ignition, 750 DP Holley, Vette Brakes Suspension, 3.70
gears Best time 12.70 at 110 Marlton NJ

Homepage http://corvetteforum.net/c3/gordon72/

The Dude
Senior
Member

4772 posts [100%]
O.C. Calif.

Re: Hydraboost
Brakes (flynhi)

11:12
AM 6/13/2002

This is an intersting topic to me since I'm
seriously considering ditching vacuum power brakes in favor of
manuals.

How is this system plumbed? And, more importantly, a
conversion to manual steering would be out of the question if
using a hydraboost system, yes?
_______

norvalwilhelm
Senior
Member

1775
posts [100%]
Waterloo ontario Canada

Re: Hydraboost
Brakes (Gordonm)

11:31
AM 6/13/2002

I have a few pictures but not for posting on
the forum. I could send it directly to you.
This is a
little hard to see because everything is black

_______

Norval

norvalwilhelm
Senior
Member

1775
posts [100%]
Waterloo ontario Canada

Re: Hydraboost
Brakes (norvalwilhelm)

11:51
AM 6/13/2002

Another picture I found

_______

Norval

Jim Shea
Senior
Member

996 posts [100%]
Saginaw, MI

Re: Hydraboost
Brakes (The Dude)

2:25
PM 6/13/2002

To THE DUDE,
There isn't any reason why you
couldn't just plumb a power steering hose back to the
hydraboost unit and then back to the power steering pump. You
don't need the power gear or control valve. But you do need a
hydraulic power source.

There is a high pressure power steering hose that goes to
the booster. Normally there is another high pressure hose that
goes to the gear (or control valve). There is a low pressure
hose from the booster to the pump reservoir. There is another
low pressure return hose from the gear to the pump reservoir.
Some reservoirs for hydraboost vehicles actually have two
brazed pipes for the two low pressure returns. Other systems
just tee the two low pressure hoses together.

If you don't have a power steering gear, where you had a
high pressure hose to the gear, you now just need a low
pressure hose back to the reservoir. There will still be a
second low pressure hose that can be "tee'd" into the first
low pressure line.

[Modified by Jim Shea, 5:38 PM
6/13/2002]

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