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farmhawk
12-29-2006, 12:55 PM
I am converting my 61 Hawk from power brakes to manual because of a missing hydravac. I've looked around and have been unable to secure one. I am also converting to a dual master cylinder using Turner Brakes' conversion bracket. I have a seperate brake pedal pivot point that bolts to the frame. (See photos) This is the pivot towards the front of the car. I cannot find a reference to this part in any of the manuals, it is a seperate bolt on part. Is this unique to power brakes? Do I need to find a different pedal configuration for manual brakes? It is a 3 spd w/OD so I do have a clutch pedal also.

http://i134.photobucket.com/albums/q90/wkroeger/LookingDownontheMasterCylandHillhol.jpg?t=1167414854
Brake Pedal Pivot is at the top of the picture.

http://i134.photobucket.com/albums/q90/wkroeger/ShowingBrakeandClutchPedalSprings.jpg?t=1167415149
Brake and Clutch Pedal Configuration

Wayen K.
Libby, MT
61 Hawk (Project)

41 Frank
12-29-2006, 02:21 PM
Yes the non powerbrake cars use a different pedal assy, it attached differently under the car. I did this changeover on my 62 GTHawk.
I can't remember all the details but I remember the pedal for power brakes is shorter.You would be better off to find a parts car or someone that has these parts.

farmhawk
12-29-2006, 09:19 PM
Anyone know of a supplier for rebuilt Hydravacs, I don't have a core. I think it would be easier to keep the power brakes!

Wayen K.
Libby, MT
61 Hawk (Project)

Roscomacaw
12-29-2006, 10:52 PM
I think JDP has them, rebuilt.

Miscreant adrift in
the BerStuda Triangle
http://images.andale.com/f2/115/106/906179/2006/12/7/truckonhill3.jpg

1957 Transtar 1/2ton
1960 Larkvertible V8
1958 Provincial wagon
1953 Commander coupe

Dan White
12-30-2006, 07:58 AM
I got one from JDP! Nice work too! Note that the Turner dual master cylinder or any dual master cylinder will not work with a Hydrovac, for some reason Turner does not tell anyone that? He should put a disclaimer on the kit and ask the question before someone orders it.

Also, you have a Hill Holder which I believe you will need to eliminate also.

Dan White
64 R1 GT
64 R2 GT

Neal in NM
12-30-2006, 11:37 AM
There's one for sale on ebay right now. Neal

http://cgi.ebay.com/ebaymotors/Hydrovac-Booster-Chev-Dodge-Ford-GMC-IHC-Studebaker_W0QQitemZ280062701641QQihZ018QQcategoryZ42605QQrdZ1QQcmdZViewItem

And heres another.

http://cgi.ebay.com/ebaymotors/studebaker-ford-chevy-gmc-dodge-power-brake-unit_W0QQitemZ220064313943QQihZ012QQcategoryZ6763QQrdZ1QQcmdZViewItem

John Kirchhoff
12-30-2006, 07:46 PM
Actually you wouldn't have to eliminate the HillHolder, just plumb either the front or rear brakes through it.

farmhawk
12-31-2006, 09:48 AM
JDP doesn't have hydravacs available right now. Anyone have a core available to be rebuilt? Most places I have checked need cores. If you can run the hillholder through either the front or rear lines, what would be the ramifications of running the power unit through the front lines? The front has most of the braking power. Just a thought.

Wayen K.
Libby, MT
61 Hawk (Project)

John Kirchhoff
12-31-2006, 11:38 AM
Running only one braking circuit through the Hydrovac would probably cause that one to lock up before the other. Once you apply the brakes, the hydraulic pressure opens circuits in the Hydrovac which allows engine vacuum to apply additional force to the piston pushing the brake fluid. If hooked up to the front brakes, I have a feeling it would make the rear brakes pretty much ineffective at anything less than a white knuckled, both feet on the brake pedal kind of stop. JDP probably has a better idea of the effects though than me.

Roscomacaw
12-31-2006, 04:27 PM
I've got a core here that I THINK came off a truck. Does anyone think single-circuit assist is anything but single-circuit assist? In other words, assistance is assistance, no matter what. Right? The vacuum part of this thing is just like the car hydrovac. The only thing that looks a bit different is the hyd part.

Miscreant adrift in
the BerStuda Triangle
http://images.andale.com/f2/115/106/906179/2006/12/7/truckonhill3.jpg

1957 Transtar 1/2ton
1960 Larkvertible V8
1958 Provincial wagon
1953 Commander coupe

Dan White
12-31-2006, 05:34 PM
It is definitely not adviseable to use the Hydrovac on one end of the brake circuit! You have a choice of either Hydrovac or dual master cylinder. If you do a search on this forum there are numerous threads regarding the Hydrovac, dual MC, etc. These maybe good reading for you. I would also try looking at some of the Studebaker used parts vendors in the TW to find a Hydrovac core.

Dan White
64 R1 GT
64 R2 GT

farmhawk
01-01-2007, 10:05 AM
I wasn't seriously concidering using the Hydrovac with the dual M/C setup. It was a just a topic to throw out to check the possibilities. I am not in a serious need for the part right now, probably won't need it until spring, the body is still on the rotator. I do have about 5 tons of scrap metal and car parts I might sort through back at the shop on the farm where I got the Hawk, I suspect the original Hyrdovac may be there! But before I put the body back on the frame I do need to decide which braking system to use.

Wayen K.
Libby, MT
61 Hawk (Project)