[GMCnet] Hydromax brake booster install pictures
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Wally Anderson
Jan 8, 2022, 12:28:33 PM1/8/22
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Blog post about Installing a hydromax brake booster from a IHC school bus on the GMC. It fits kinda but is pretty long. Electric backup and requires a
separate hydraulic pump. Finally got enough pressure to drag tires with all disc
brakes.https://wallyandsue.blogspot.com/2022/01/hydromax-and-gmc-motorhome.html
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Wally Anderson
Omaha NE
75 Glenbrook
Megasquirt EFI Onan & 455
Bosch Hydromax
Manny reaction arm system
Kelsey Hayes park brake
http://wallyandsue.blogspot.com/
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separate hydraulic pump. Finally got enough pressure to drag tires with all disc
brakes.https://wallyandsue.blogspot.com/2022/01/hydromax-and-gmc-motorhome.html
--
Wally Anderson
Omaha NE
75 Glenbrook
Megasquirt EFI Onan & 455
Bosch Hydromax
Manny reaction arm system
Kelsey Hayes park brake
http://wallyandsue.blogspot.com/
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Mike Hamm via Gmclist
Jan 8, 2022, 1:28:57 PM1/8/22
to gmc...@list.gmcnet.org, Mike Hamm
I think I'll stay with my original brakes.
Work fine and I don't have to do any more work.
--
1977 Kingsley 455 as stock as it gets except lots of Ragusa parts
Work fine and I don't have to do any more work.
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1977 Kingsley 455 as stock as it gets except lots of Ragusa parts
James Hupy
Jan 8, 2022, 1:39:40 PM1/8/22
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I used to have a S.O.B. chassis built Open Road motor home built on a D-200
Dodge Van chassis. 360 Chrysler for power. The power brake booster was
mounted like a GMC motorhome, but after the booster came a right angle bell
crank bracket that the master cylinder bolted to. It allowed the front of
the body to be close under the windshield. It might be easily be adapted to
some of these powerboosters that have been shoehorned under the front of
the GMC. As I recall, that Van chassis was a 75 or 76 year model. Worth a
look, anyhow.
Jim Hupy
Salem, Oregon
On Sat, Jan 8, 2022, 10:29 AM Mike Hamm via Gmclist <gmc...@list.gmcnet.org>
wrote:
Dodge Van chassis. 360 Chrysler for power. The power brake booster was
mounted like a GMC motorhome, but after the booster came a right angle bell
crank bracket that the master cylinder bolted to. It allowed the front of
the body to be close under the windshield. It might be easily be adapted to
some of these powerboosters that have been shoehorned under the front of
the GMC. As I recall, that Van chassis was a 75 or 76 year model. Worth a
look, anyhow.
Jim Hupy
Salem, Oregon
On Sat, Jan 8, 2022, 10:29 AM Mike Hamm via Gmclist <gmc...@list.gmcnet.org>
wrote:
Jon Roche
Jan 8, 2022, 4:03:38 PM1/8/22
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Time to put some sort of headache rack in So you are not injured by a can of soup flying forward.
--
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
Tom Whitton
Jan 9, 2022, 2:23:42 PM1/9/22
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Wally, your upgrades show an impressive amount of engineering and craftsmanship with a successful outcome. Rear disks require the additional fluid that your system provides. I have stock rear drums but was able to improve braking by replacing the vacuum booster with a Hydro boost system. This upgrade from stock increased the fluid pressure and stopping ability fairly significantly. Fortunately, this fits under the hood with space to spare.
There isn't adequate space under the hood for larger capacity master cylinders needed by rear disks. To overcome the space problem, I understand another solution is in the works. It is an adaption of the bell crank system to actuate a larger capacity master cylinder. Like your solution, it will provide more needed fluid to rear disks. Similar to what Jim Hupy described, the bell crank connects to a front frame mounted large capacity master cylinder. All this to help bring our seventies technology to the two thousand twenties and fit it under our hoods.
Tom Whitton
Upgraded 26 footer
Paducah, Ky
There isn't adequate space under the hood for larger capacity master cylinders needed by rear disks. To overcome the space problem, I understand another solution is in the works. It is an adaption of the bell crank system to actuate a larger capacity master cylinder. Like your solution, it will provide more needed fluid to rear disks. Similar to what Jim Hupy described, the bell crank connects to a front frame mounted large capacity master cylinder. All this to help bring our seventies technology to the two thousand twenties and fit it under our hoods.
Tom Whitton
Upgraded 26 footer
Paducah, Ky
Tom Whitton
Jan 9, 2022, 3:28:27 PM1/9/22
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Follow-up... Wally, would you mind describing the difference between Hydro max and Hydro boost?
By the way, to those following this discussion, the Hydro boost replacement to the vacuum booster uses the stock master cylinder since rear drums don't need any more volume than standard.
By the way, to those following this discussion, the Hydro boost replacement to the vacuum booster uses the stock master cylinder since rear drums don't need any more volume than standard.
CJV
Jan 9, 2022, 5:03:17 PM1/9/22
to gmclist
Following with interest...
CJ Vermeulen, Scribbler
CJ Vermeulen, Scribbler
Wally Anderson
Jan 9, 2022, 6:22:49 PM1/9/22
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Tom Whitton wrote on Sun, 09 January 2022 14:28
Short version is the Hydromax has a larger power piston than Hydroboost, Hydroboost about 1.5" diameter and the Hydromax about 3.25" diameter, larger
area is more force to the master. Hydroboost has a hydraulic accumulator for backup and the Hydromax has an electric pump for backup. Hydroboost is a
power beyond deal so it can have back pressure, flow path is pump,steering gear,reservoir. Hydromax can't have back pressure so it has to be last in
the flow path and won't work with our steering gear so it needs a separate pump.
Here is a couple links for information on Hydroboost.
https://www.classicwinnebagos.com/forum/index.php?topic=9126.0
http://dave78chieftain.com/hydroboost_brakes/HydroboostDescandRepair.pdf
Here is a link to Bosch's Hydromax manual
https://1999southwind.com/DOWNLOAD/Bosch%20HydroMax%20Booster%20Manual.pdf
Bob Stone is working on a in front of the radiator crosswise booster master system that has bellcranks. Lots of room to put whatever combination you
want there. Here is a image link.
http://www.gmcmhphotos.com/photos/uploads/311/project_1332.jpg
area is more force to the master. Hydroboost has a hydraulic accumulator for backup and the Hydromax has an electric pump for backup. Hydroboost is a
power beyond deal so it can have back pressure, flow path is pump,steering gear,reservoir. Hydromax can't have back pressure so it has to be last in
the flow path and won't work with our steering gear so it needs a separate pump.
Here is a couple links for information on Hydroboost.
https://www.classicwinnebagos.com/forum/index.php?topic=9126.0
http://dave78chieftain.com/hydroboost_brakes/HydroboostDescandRepair.pdf
Here is a link to Bosch's Hydromax manual
https://1999southwind.com/DOWNLOAD/Bosch%20HydroMax%20Booster%20Manual.pdf
Bob Stone is working on a in front of the radiator crosswise booster master system that has bellcranks. Lots of room to put whatever combination you
want there. Here is a image link.
http://www.gmcmhphotos.com/photos/uploads/311/project_1332.jpg
--
Wally Anderson
Omaha NE
75 Glenbrook
Megasquirt EFI Onan & 455
Bosch Hydromax
Manny reaction arm system
Kelsey Hayes park brake
http://wallyandsue.blogspot.com/
Wally Anderson
Omaha NE
75 Glenbrook
Megasquirt EFI Onan & 455
Bosch Hydromax
Manny reaction arm system
Kelsey Hayes park brake
http://wallyandsue.blogspot.com/
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