| [GMCnet] Re: Hydro max brake booster install pictures [message #368401] |
Sun, 09 January 2022 13:23  |
Tom Whitton
Messages: 235
Registered: February 2004
Location: Paducah, KY
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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
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| [GMCnet] Re: Hydro max brake booster install pictures [message #368402 is a reply to message #368401] |
Sun, 09 January 2022 14:28  |
Tom Whitton
Messages: 235
Registered: February 2004
Location: Paducah, KY
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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.
Tom Whitton
Upgraded 26 footer
Paducah, Ky
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| Re: [GMCnet] Re: Hydro max brake booster install pictures [message #368405 is a reply to message #368402] |
Sun, 09 January 2022 17:20 |
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wally
Messages: 643
Registered: August 2004
Location: Omaha Nebraska
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Tom Whitton wrote on Sun, 09 January 2022 14:28Follow-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.
Tom Whitton
Upgraded 26 footer
Paducah, Ky
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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
Wally Anderson
Omaha NE
75 Glenbrook
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