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06-18-2022, 06:25 PM
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#1
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Member
Join Date: May 2022
Posts: 35
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Towed brake systems for a hydro boosted vehicle
Can a vehicle with a hydro boost (not vacuum) brake system be flat towed with a supplemental brake system for towed vehicle brake assistance?
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06-18-2022, 07:24 PM
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#2
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 26,109
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The accurate answer is in the owners manual under "recreational towing". If the owners manual does not have such a section, it's implied the vehicle is unsuitable for flat-towing.
Sure, there are online flat-towing guides, but I have seen glaring errors in them.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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06-18-2022, 07:25 PM
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#3
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 27,020
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I would think so , because the first part of the set up of my toad brake system , is cycling the brake pedal , a number of times , to bleed off the vacuum ;so the toad brake system is working without assist . 
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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06-19-2022, 06:27 AM
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#4
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Member
Join Date: May 2022
Posts: 35
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Quote:
Originally Posted by Ray,IN
The accurate answer is in the owners manual under "recreational towing". If the owners manual does not have such a section, it's implied the vehicle is unsuitable for flat-towing.
Sure, there are online flat-towing guides, but I have seen glaring errors in them.
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The vehicle can be flat towed. I got that verified. I just was not sure if having a hydro vs vacuum boost on the towed vehicle made any difference a supplemental brake system.
For example the Roadmaster Invisibrake (RMI) is not compatible with this vehicle. the RMI taps into the vacuum line of the booster. Whereas others like Brake Buddy do not. I will call the Sup Brake System tech lines tomorrow. Just don't know if there are any other gotchas for this towed vehicle. Make sense now?
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06-20-2022, 06:01 AM
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#5
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Senior Member
Join Date: Oct 2020
Posts: 224
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The RVI3 has settings to accommodate both conventional vacuum boosted and hydro boosted systems. The adjustment sets the amount of force the unit applies when braking based on whether the power brakes are active, or if it’s a dead pedal, so to speak. Link to the user manual: https://drive.google.com/file/d/1-I2...DQCkmfr2s/view
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06-20-2022, 03:01 PM
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#6
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 26,109
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Quote:
Originally Posted by surypap3
The vehicle can be flat towed. I got that verified. I just was not sure if having a hydro vs vacuum boost on the towed vehicle made any difference a supplemental brake system.
For example the Roadmaster Invisibrake (RMI) is not compatible with this vehicle. the RMI taps into the vacuum line of the booster. Whereas others like Brake Buddy do not. I will call the Sup Brake System tech lines tomorrow. Just don't know if there are any other gotchas for this towed vehicle. Make sense now?
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Yep, got it. It really helps when I learn the whole story.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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06-20-2022, 04:49 PM
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#7
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Senior Member
Join Date: Jan 2011
Location: Wandering below the Gnat Line
Posts: 1,598
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Isn't the hydroboost going to boost using the electric emergency booster motor when the brake pedal is pressed? Unless small vehicles don't have the motor, I don't know.
__________________
-jbh-
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06-21-2022, 07:06 AM
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#8
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Member
Join Date: May 2022
Posts: 35
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I called Blue Ox on their Patriot 3 model. They said the unit does not care whether vacuum of hydro boost is the vehicle system.
One of the things that sticks in my mind is stopping power (extra) foot pressure needed when the vehicle engine is not operating. I am guessing the extra stopping power (engine off in tow) is created by the supplemental device with more mechanical pressure? Thoughts?
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