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#1476852 Tue Nov 29 2022 04:56 AM
Joined: Jul 2004
Posts: 3,932
R
'Bolter
I know this topic has been beat to death here, but my '59 Viking 40 has been having some brake problems. I had suspected, and my mechanic has now confirmed, that there are some issues with the hydrovac. I know people on here have either gotten theirs rebuilt, or gotten new ones, but so far my guy has not been able to locate one through any of his suppliers. But a couple questions did come up and I thought I'd ask here.

1. Does the 40 series (1- 1/2 ton) take a different unit than the 60 series (2 ton)? I had assumed they were the same. He's being told they are not.

2. They also asked him whether the truck had a V-8 or a 6 cylinder--does that make a difference? This truck has a V-8, but my understanding is that it was added later, and is not original to the truck.

The plan for now is that they are going to bypass the hydrovac (and possibly remove it) for the time being so we can at least drive the truck for now. Just wondering if this would work for a permanent solution. This truck is not going to be hauling any heavy loads--at least not while I own it--and not many farmers are going to be looking for a 63 year old grain hauler! Otherwise, it will at least give me the rest of the winter to look for a rebuild or a replacement. The truck itself will not be driven over the winter.

Thoughts?


Rich

'47 Loadmaster [stovebolt.com]

1947 Chev. Loadmaster

1959 Chev. Viking 40

Genie: "I am the genie from a magic lamp and I have the power to grant you three wishes."
Me: "I want to be rich."
Genie: "OK, Rich, what's your second wish?"
Rich'sToys #1476861 Tue Nov 29 2022 12:49 PM
Joined: Feb 2016
Posts: 866
7
'Bolter
Hi Rich, I rebuilt my entire brake system except the Hydro-Vac, that was a couple years ago. I bypassed the Hydro-Vac by not connecting the brake lines to it, I drove the truck with manual brakes for that time even with some loads. You have to anticipate any trouble ahead as the brakes are not fast acting BUT they still bring the truck to a stop. I recently ordered a rebuild kit for the Hydro-Vac and that project was successful, now the complete brake system is in great shape and I don't think twice about it. My truck is a 2 ton LCF with the factory 283 V8.

Last edited by 78buckshot; Tue Nov 29 2022 12:50 PM.

1957 Chevrolet 5700 LCF 283 SM420 single speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
Rich'sToys #1476862 Tue Nov 29 2022 12:49 PM
Joined: Nov 2009
Posts: 82
D
'Bolter
Geoffrey Rosenberg at Alretta Truck Parts in Massachusetts (508) 788-9409 has tons of brake part knowledge. I bought all my brake parts from him including my remanufactured hydrovac from him a few years ago.

Rich'sToys #1476900 Tue Nov 29 2022 06:27 PM
Joined: Mar 2004
Posts: 5,836
M
'Bolter
There should be a tag on the Hydrovac unit with the Bendix part number, what's the number?

My parts books show that the 55-59 Series 4, 5 & 6 (exc. HD Brake Booster) used the same Hydrovac.

See if there's something in this thread that helps...

https://www.stovebolt.com/ubbthread...895/bendix-or-midland-brake-booster.html

Mike B smile

Rich'sToys #1476998 Wed Nov 30 2022 02:46 PM
Joined: Dec 2018
Posts: 2,101
F
'Bolter
Rich's Toys Service your hydro-vac like the service book says,Jim Carter himself told me to use hydraulic jack oil from my local FLAPS in it. Fixed it right up,have 2 that are 73 yrs old work fine. That leather cup in there gets dry,needs lube.

Rich'sToys #1477511 Sun Dec 04 2022 03:59 PM
Joined: Jul 2022
Posts: 53
M
'Bolter
If you cant rebuild it yourself, i got mine rebuilt by cardone through rock auto for about $170. Only place i could find that would rebuild it.


59 chevy Spartan 100, former firetruck
348ci with spicer 5 speed and electric rear
Rich'sToys #1477528 Sun Dec 04 2022 06:48 PM
Joined: Feb 2016
Posts: 866
7
'Bolter
When I rebuilt mine I used motorcycle hydraulic fork oil for the leather.


1957 Chevrolet 5700 LCF 283 SM420 single speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
78buckshot #1477809 Tue Dec 06 2022 04:41 PM
Joined: Dec 2018
Posts: 2,101
F
'Bolter
78 buckshot Most oil would be a big no-no around brakes,I filled an 1-1/2 wheel cylinder cup with hydraulic jack oil to see,never hurt it at all. My OLD hydraulic jack guy said use ATF in em !! (the jacks) So go figure,my hydrovacs have had HJO 3 or 4 times their happy.

Rich'sToys #1477847 Tue Dec 06 2022 09:24 PM
Joined: Feb 2016
Posts: 866
7
'Bolter
If everything in the Hydro-Vac is correct, the few ounces of oil in the air chamber shouldn't come in contact with the brake fluid section. I think I contacted the company that supplied my kit and checked with them.


1957 Chevrolet 5700 LCF 283 SM420 single speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
78buckshot #1478180 Fri Dec 09 2022 12:20 PM
Joined: Dec 2018
Posts: 2,101
F
'Bolter
78buckshot Not scared of the hydraulic jack oil anymore,try to put it in twice a year. Boosters are happy will slide the tires,usually climb on the brakes at my road to see if they are working right. Full pedal stops good !

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