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1957 Chevy 3100 Hydrovac
#1409388 Mon May 10 2021 08:58 PM
Joined: Jan 2019
Posts: 70
C
Cozsum Offline OP
'Bolter
Hi,

Anyone ever seen or put a Hydrovac system on a 3100? I see it was an option but curios how many truck got them? Anyone have a 1/2 with one installed?

Thx

Re: 1957 Chevy 3100 Hydrovac
Cozsum #1409549 Tue May 11 2021 07:14 PM
Joined: Dec 2018
Posts: 713
F
'Bolter
Cozsum Never really saw it but would be OK, however more of a 47 to 54 guy. Others will chime in on that .

Re: 1957 Chevy 3100 Hydrovac
Cozsum #1409552 Tue May 11 2021 07:23 PM
Joined: Mar 2007
Posts: 1,197
T
Crusty Old Sarge
It would really depend on if you are using the original master cylinder or an aftermarket type. Performance On Line (POL) supplies a kit for a Hydro Booster...

https://www.performanceonline.com/1...ost-power-brake-booster-kit-frame-mount/


Craig

Come, Bleed or Blister something has got to give!!!
59' Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)
Re: 1957 Chevy 3100 Hydrovac
Cozsum #1409709 Wed May 12 2021 09:01 PM
Joined: Apr 2005
Posts: 1,865
R
'Bolter
The Factory Assembly Manual Sect 5 Sheet 3.00 shows the mounting location for the hydrovac on the inside of the right frame rail behind the transmission for models 4000-6000. Other references I have show it as an option for 3100 through 3800 series but don't show any location information.
I saw one on a 57 Cameo several years ago that was optioned with power steering as well. The unit was mounted under the hood on the lower left side behind the core support. I'm not sure it was correct however, it looked like a passenger car unit. It may have been dealer installed.
Fred

I'm assisting in the completion of a 57 3100 that has been apart for several years. The owner has a hydrovac unit that he wants installed but he is mostly busy chasing shinny objects. At some point he is going to get serious so we can finish it.


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
Re: 1957 Chevy 3100 Hydrovac
rfs56trk #1409723 Thu May 13 2021 12:00 AM
Joined: Jan 2019
Posts: 70
C
Cozsum Offline OP
'Bolter
Hi,

I think thats where I got those pictures, I never really checked to see what model those pics belong to, I will double check. There is a truck on hemmings that sold that had factory power brakes and power steering. The location was on the pass side frame close to the front side of the engine.

Im working on my 57 3100 now, have it down to the frame and doing the brakes. Im getting the engine done and hydramatic rebuilt... thought it would be the time to one of these units (hydrovac's) in while everything is open. What are you doing on your friends truck?

Re: 1957 Chevy 3100 Hydrovac
Cozsum #1409734 Thu May 13 2021 02:25 AM
Joined: Mar 2004
Posts: 5,136
M
'Bolter
My 1957 Accessory Installation Manual doesn't show a Hydrovac for the trucks, only the cars. But it is shown in the 1958 Accessory Installation Manual. It's shown hanging on the right side frame rail over the front axle, with (2) hydraulic lines running from it back to the crossmember that has the right front brake line already on it and then back up to the MC. The Vacuum hose comes from the intake manifold and crosses over the top of the engine between the front of the valve cover and the T-stat housing.

Mike B smile

Re: 1957 Chevy 3100 Hydrovac
Cozsum #1409778 Thu May 13 2021 03:46 PM
Joined: Apr 2005
Posts: 1,865
R
'Bolter
The 57 belonged to my friend's father which was passed down. The body and paint were great but the everything else was tired. He tore it down and had the frame powder coated. The body is back on the chassis and the engine has been upgraded to a 327. I built an overdrive trans for it. I'm just waiting for him to get his act together so we can finish it.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
Re: 1957 Chevy 3100 Hydrovac
rfs56trk #1409818 Thu May 13 2021 10:46 PM
Joined: Jan 2019
Posts: 70
C
Cozsum Offline OP
'Bolter
Wow, sounds like a great truck. Hope it sees the road soon!

Re: 1957 Chevy 3100 Hydrovac
Mike B #1409819 Thu May 13 2021 10:47 PM
Joined: Jan 2019
Posts: 70
C
Cozsum Offline OP
'Bolter
Originally Posted by Mike B
My 1957 Accessory Installation Manual doesn't show a Hydrovac for the trucks, only the cars. But it is shown in the 1958 Accessory Installation Manual. It's shown hanging on the right side frame rail over the front axle, with (2) hydraulic lines running from it back to the crossmember that has the right front brake line already on it and then back up to the MC. The Vacuum hose comes from the intake manifold and crosses over the top of the engine between the front of the valve cover and the T-stat housing.

Mike B smile

Thanks! If I find the correct brackets I will put one in, if not I will keep it as is. Im thinking its going to be tough to find!

Re: 1957 Chevy 3100 Hydrovac
Cozsum #1409831 Fri May 14 2021 01:05 AM
Joined: Mar 2004
Posts: 5,136
M
'Bolter
Originally Posted by Cozsum
Thanks! If I find the correct brackets I will put one in, if not I will keep it as is. Im thinking its going to be tough to find!

In all my years of playing with the TF trucks I've only seen 2 or 3 and they were all on show quality Cameo's...never found one in any junk yard hunt and I've been doing that since the mid 70's...most of the good old yards are all gone now. If it's more than 10 years old it gets crushed, no one saves the old stuff anymore.

Mike B smile


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