Home » Public Forums » GMCnet » Anyone recognize what these brake parts are???
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| Re: Anyone recognize what these brake parts are??? [message #255269 is a reply to message #255264] |
Sun, 13 July 2014 20:20   |
lotsofspareparts
Messages: 726
Registered: May 2014
Location: Arlington, WA
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Should I get rid of them? The bottom picture with the big unit is tied into the rear brakes and the vacuum system.
Seems like a lot of hardware with bleeder valves, the lower unit has 3 of them.
Jared
Jared & Tina Lazaron + 14yr old Daughter.....
77 Eleganza II "Recherché".....
73 Canyon Lands 230 "Elephant"
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| Re: Anyone recognize what these brake parts are??? [message #255273 is a reply to message #255269] |
Sun, 13 July 2014 20:55 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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lotsofspareparts wrote on Sun, 13 July 2014 20:20Should I get rid of them? The bottom picture with the big unit is tied into the rear brakes and the vacuum system.
Seems like a lot of hardware with bleeder valves, the lower unit has 3 of them.
Jared
The bottom unit is not a stock item. It appears to be some sort of auxiliary brake pressure booster.
The small cylinders in the brake lines were supposed to be a form of antilock braking. These were popular with racers back in the mid to late 70's. They only were around for a year or two until they were found to be ineffective. IIRC the mfr of these got in trouble with the feds for false advertising claims. I can't recall the name of these things but if someone comes up with it, it will be an interesting google search..
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Anyone recognize what these brake parts are??? [message #255288 is a reply to message #255274] |
Sun, 13 July 2014 22:16 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Lot of people feel it is like Snake Oil.
I have had few reputable people tell me that it has made difference.
Apparently there is a small piston that gives as the brake drum or caliper
rotates out of round (runout)
I ran them back in 1984 and saw slight improvement.
That company was taken to court and fought and almost went out of business.
On Sun, Jul 13, 2014 at 7:00 PM, Wally Anderson
wrote:
> midlf wrote on Sun, 13 July 2014 20:55
>> lotsofspareparts wrote on Sun, 13 July 2014 20:20
>>> Should I get rid of them? The bottom picture with the big unit is tied
> into the rear brakes and the vacuum system.
>>>
>>> Seems like a lot of hardware with bleeder valves, the lower unit has 3
> of them.
>>>
>>> Jared
>>
>>
>> The bottom unit is not a stock item. It appears to be some sort of
> auxiliary brake pressure booster.
>>
>> The small cylinders in the brake lines were supposed to be a form of
> antilock braking. These were popular with racers back in the mid to late
>> 70's. They only were around for a year or two until they were found to
> be ineffective. IIRC the mfr of these got in trouble with the feds for
>> false advertising claims. I can't recall the name of these things but
> if someone comes up with it, it will be an interesting google search..
>
> The bottom thing looks like a Bendix hydrovac booster.
> http://dave78chieftain.zxq.net/HydroVac_brakes.html
> It boosts brake pressure. Last one I worked with was on a mid 60's gas
> dump truck.
> HTH
> --
> Wally Anderson
> 1975 Glenbrook
> Megasquirt 455 port injection science project
> Omaha Nebraska
> Greater Midwest Classics
> GMCES
> http://wallyandsue.blogspot.com/
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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www.appliedgmc.com
1-800-752-7502
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| Re: Anyone recognize what these brake parts are??? [message #255293 is a reply to message #255273] |
Sun, 13 July 2014 22:31 |
lotsofspareparts
Messages: 726
Registered: May 2014
Location: Arlington, WA
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Those are certainly going then. I would rather have a brake that locks up, not in an emergency situation mind you, but I would like it to go SCREEEEECH during brake testing. Not sure if that can happen weighing 12k though.
Are the brakes on the GMC MH supposed to lock up if you throw your weight into the brake pedal?
Jared
Jared & Tina Lazaron + 14yr old Daughter.....
77 Eleganza II "Recherché".....
73 Canyon Lands 230 "Elephant"
[Updated on: Sun, 13 July 2014 22:32] Report message to a moderator |
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| Re: Anyone recognize what these brake parts are??? [message #255294 is a reply to message #255293] |
Sun, 13 July 2014 22:53 |
Otterwan
Messages: 946
Registered: July 2013
Location: Lynnwood (north of Seattl...
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lotsofspareparts wrote on Sun, 13 July 2014 20:31
Are the brakes on the GMC MH supposed to lock up if you throw your weight into the brake pedal?
Jared
The rears will probably lock as drums are prone to do, the front hopefully not unless you really bury your foot in it. As I recall the geometry of the bogies makes the rearmost wheel unload under hard braking, so it is likely to lock up first. There are systems sold to keep this wheel down and thus increase overall braking. I think both Jims sell them. There's a video somewhere showing how they work.
Ah, hear it is: http://www.youtube.com/watch?v=1peHuX6NpH0
1977 Birchaven, Lynnwood WA - "We may not be able to stop all evil in the world, but I know that how we treat one another is entirely up to us."
[Updated on: Sun, 13 July 2014 22:57] Report message to a moderator |
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| Re: [GMCnet] Anyone recognize what these brake parts are??? [message #255318 is a reply to message #255311] |
Mon, 14 July 2014 09:56 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Larry,
I didn't know you had the GH. Probably one of the most beautiful cars ever
built, IMHO (except, perhaps for the original '53). Fellow here had a
pretty nice Silver Hawk in a barn a few years back; don't know whether it's
still there. I'm beyond wanting a project now anyway. :-)
Ken H.
On Mon, Jul 14, 2014 at 9:24 AM, Larry wrote:
>
> My 56' Studebaker GH has that thing for a power brake booster, and was
> used in a lot of Studebaker's of that vintage. JFWIW
> --
>
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Ken Henderson
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www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Anyone recognize what these brake parts are??? [message #255322 is a reply to message #255318] |
Mon, 14 July 2014 11:03 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
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G'day,
My Dad bought a '49 Studebaker as our first car after the war, he traded it in for a two tone green '53 Champion. I used to sit up
on the back seat armrest so I could look out the windshield.
I don't know about you being beyond wanting a project; I would add the word "another." ;-)
Regards,
Rob M
-----Original Message-----
From: Ken Henderson
Larry,
I didn't know you had the GH. Probably one of the most beautiful cars ever built, IMHO (except, perhaps for the original '53).
Fellow here had a pretty nice Silver Hawk in a barn a few years back; don't know whether it's still there. I'm beyond wanting a
project now anyway. :-)
Ken H.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: Anyone recognize what these brake parts are??? [message #255388 is a reply to message #255293] |
Mon, 14 July 2014 20:15 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
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lotsofspareparts wrote on Sun, 13 July 2014 21:31Those are certainly going then. I would rather have a brake that locks up, not in an emergency situation mind you, but I would like it to go SCREEEEECH during brake testing. Not sure if that can happen weighing 12k though.
Are the brakes on the GMC MH supposed to lock up if you throw your weight into the brake pedal?
Jared
Set up correctly all six will lock. Most people will argue but I suspect they have never had a stock system in excellent condition and adjustment.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: Anyone recognize what these brake parts are??? [message #255393 is a reply to message #255388] |
Mon, 14 July 2014 20:21 |
lotsofspareparts
Messages: 726
Registered: May 2014
Location: Arlington, WA
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Bob de Kruyff wrote on Mon, 14 July 2014 18:15lotsofspareparts wrote on Sun, 13 July 2014 21:31Those are certainly going then. I would rather have a brake that locks up, not in an emergency situation mind you, but I would like it to go SCREEEEECH during brake testing. Not sure if that can happen weighing 12k though.
Are the brakes on the GMC MH supposed to lock up if you throw your weight into the brake pedal?
Jared
Set up correctly all six will lock. Most people will argue but I suspect they have never had a stock system in excellent condition and adjustment.
Hey Bob, completely stock, what is the proportion between the front and rear brakes? I am imaging since there are 4 brakes in the rear, and "Car" rotors in the front that the majority of the braking may come from the rear wheels.
????
Jared
Jared & Tina Lazaron + 14yr old Daughter.....
77 Eleganza II "Recherché".....
73 Canyon Lands 230 "Elephant"
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| Re: [GMCnet] Anyone recognize what these brake parts are??? [message #255396 is a reply to message #255318] |
Mon, 14 July 2014 20:28 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
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Ken Henderson wrote on Mon, 14 July 2014 09:56Larry,
I didn't know you had the GH. Probably one of the most beautiful cars ever
built, IMHO (except, perhaps for the original '53). Fellow here had a
pretty nice Silver Hawk in a barn a few years back; don't know whether it's
still there. I'm beyond wanting a project now anyway. 
Ken H.
On Mon, Jul 14, 2014 at 9:24 AM, Larry wrote:
>
> My 56' Studebaker GH has that thing for a power brake booster, and was
> used in a lot of Studebaker's of that vintage. JFWIW
> --
>
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Ken,
I'm almost ashamed to say that it has been sitting in my tuck-under garage for the last 20 yrs. Every year I tell myself that I'm gonna get that thing out (needs an oil pumpand fix the brakes) and the GMC keeps me from it. My goal now is to do it at the beginning of next summer and take it to the "Back to the Fifties" car show in MPLS. We shall see.....
Larry
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Anyone recognize what these brake parts are??? [message #255401 is a reply to message #255396] |
Mon, 14 July 2014 20:55 |
lotsofspareparts
Messages: 726
Registered: May 2014
Location: Arlington, WA
Karma: -9
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[/quote]
Ken,
I'm almost ashamed to say that it has been sitting in my tuck-under garage for the last 20 yrs. Every year I tell myself that I'm gonna get that thing out (needs an oil pumpand fix the brakes) and the GMC keeps me from it. My goal now is to do it at the beginning of next summer and take it to the "Back to the Fifties" car show in MPLS. We shall see.....[/quote]
Back to the pictures guys..... Is this a setup I should trash and go back to OEM??
Jared
Jared & Tina Lazaron + 14yr old Daughter.....
77 Eleganza II "Recherché".....
73 Canyon Lands 230 "Elephant"
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| Re: [GMCnet] Anyone recognize what these brake parts are??? [message #255410 is a reply to message #255401] |
Mon, 14 July 2014 21:58 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Jared,
The "snubbers" (I can't remember what they're called either) are JUNK -- a
fraud from the start. The FTC put the company out of business after a
while. They're nothing but tiny hydraulic accumulators with would
SUPPOSEDLY absorb brake pressure fluctuations, thereby preventing brake
lockup, etc, etc, etc. Typical snake oil sales operation. Just think
about it -- do you really want to waste some of your hydraulic fluid into
an accumulator? And if the brake pressure is fluctuating enough to need
such a device, it's time to true the discs and drums!
As for the hydrovac, or whatever, it would be interesting to experiment
with to see if it would produce increased line pressures over our
inadequate current limit of about 1100 psi. But chances are it's old, worn
out, and not longer supportable.
Ken H.
On Mon, Jul 14, 2014 at 9:55 PM, Jared wrote:
> [/quote]
> Ken,
> I'm almost ashamed to say that it has been sitting in my tuck-under garage
> for the last 20 yrs. Every year I tell myself that I'm gonna get that
> thing out (needs an oil pumpand fix the brakes) and the GMC keeps me from
> it. My goal now is to do it at the beginning of next summer and take it
> to
> the "Back to the Fifties" car show in MPLS. We shall see.....[/quote]
>
> Back to the pictures guys..... Is this a setup I should trash and go back
> to OEM??
>
> Jared
>
> --
> Jared & Tina Lazaron
>
> Daughter: Alina Lazaron 7yrs old
>
> 77 Eleganza II "Recherché"
>
> GO SEAHAWKS!!
>
> Arlington, WA 98223
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Anyone recognize what these brake parts are??? [message #255418 is a reply to message #255393] |
Mon, 14 July 2014 22:47 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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""Hey Bob, completely stock, what is the proportion between the front and rear brakes? I am imaging since there are 4 brakes in the rear, and "Car" rotors in the front that the majority of the braking may come from the rear wheels.
????
Jared""
I really don't know other than the master cylinder bores and wheel cylinder and piston diameters were balanced by design. The GMC doesn't have a proportioning valve so it is balanced only by pressure and volume calculations.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Anyone recognize what these brake parts are??? [message #255445 is a reply to message #255420] |
Tue, 15 July 2014 11:20 |
lotsofspareparts
Messages: 726
Registered: May 2014
Location: Arlington, WA
Karma: -9
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Even with the new brakes all around it does not stop as I feel it should, and if you rest your foot on the pedal with the engine running it will eventually make its way to the floor.
I was going to bleed the brakes again but after talking to Jim and Jerry at the Cascaders Rally in Arlington I want to try one of Jims pressure bleeding units.
I have been told the best way to bleed this system is Gravity Bleeding.
Jared
Jared & Tina Lazaron + 14yr old Daughter.....
77 Eleganza II "Recherché".....
73 Canyon Lands 230 "Elephant"
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