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Old 09-08-2019, 01:23 AM   #43
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Pressure reducer/regulator

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Originally Posted by birdhunter View Post
Anyone use the Roadmaster Brakemaster system on their LX470? Roadmaster says I need a pressure reducer.I know it has active electric hydroboost brakes but I tow my LX with the key in the off position so I'm not sure that the power brakes work with the key off.
Hi bird Hunter!

I tow my 2019 4Runner Off Road Premium with the Roadmaster Brakemaster system. I also tow with the ignition key in, but turned fully off, to keep the starring wheel lock from activating. On mine, the power brakes work at all times. So in my case they are correct that you need a pressure reducer/regulator, or the brakes will lock up every time you apply the motorhome brakes. I tried several cheap regulators, but they were not accurate or consistent enough. I finally ordered a low pressure one from Amazon.

https://www.amazon.com/PneumaticPlus...64ZZNEGF4ZQ8VH

I set it at about 8 psi and it works really well. 10 to 12psi will work, but you will really feel the car braking hard behind you. At the 15 psi that Brakemaster told me to try first, the wheels would almost lock up.

Good luck and regards,
Tad
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Old 09-08-2019, 09:07 AM   #44
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Thanks Tad.
I guess the questions would be do you have the same type of braking system as my lx470? Is it an electro hydroboost system with an accumulator? second question is did you try the regulator that Roadmaster sells before you purchased this nice little one?

Rich 2002 Country Coach Magna

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Originally Posted by tqqest View Post
Hi bird Hunter!

I tow my 2019 4Runner Off Road Premium with the Roadmaster Brakemaster system. I also tow with the ignition key in, but turned fully off, to keep the starring wheel lock from activating. On mine, the power brakes work at all times. So in my case they are correct that you need a pressure reducer/regulator, or the brakes will lock up every time you apply the motorhome brakes. I tried several cheap regulators, but they were not accurate or consistent enough. I finally ordered a low pressure one from Amazon.

https://www.amazon.com/PneumaticPlus...64ZZNEGF4ZQ8VH

I set it at about 8 psi and it works really well. 10 to 12psi will work, but you will really feel the car braking hard behind you. At the 15 psi that Brakemaster told me to try first, the wheels would almost lock up.

Good luck and regards,
Tad
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Old 09-08-2019, 09:32 AM   #45
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Yeah I think the electric booster pump has to run for the power brakes to work with the engine off. I'll look into it.
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Old 09-08-2019, 10:01 AM   #46
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My brake system is also the electro hydroboost system. Not sure if they are the exact same though. My power brakes are always active unless I disconnect the battery. I did not try the Roadmaster pressure regulator as it was more expensive and needed a permanent mount in the car. I mounted the regulator right on the Brakemaster brake unit itself where the air line normally attaches.

So far I have had no problems. I donít have anything mounted permanently that would show Toyota that I am towing it 4 down as my dealer said it could void my drivetrain warranty.
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Old 09-08-2019, 11:54 PM   #47
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Thank you Tad this is extremely helpful. So did you have to run power from the coach to your 4Runner to prevent the battery from running down due the electro-hydroboost coming on when your towing it?

Rich
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Old 09-09-2019, 11:56 PM   #48
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I have not added a 12volt power source from the coach to the 4Runner. I have towed 3 days in a row without unhooking, with no noticeable problem with a low battery or starting issue. I am at Lake Powell this week, but I will put up a picture of my brake unit with my regulator mod when I get back if you want.
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Old 09-10-2019, 10:50 AM   #49
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I have not added a 12volt power source from the coach to the 4Runner. I have towed 3 days in a row without unhooking, with no noticeable problem with a low battery or starting issue. I am at Lake Powell this week, but I will put up a picture of my brake unit with my regulator mod when I get back if you want.
That would be great Tad. To
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Old 09-11-2019, 06:10 PM   #50
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Flat towing Lexus LX470

Bypass tapping into the brake system and just get an RVI brake 3. While you can certainly do it, the rvi brake makes it way simpler.
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Old 09-18-2019, 11:00 AM   #51
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I have not added a 12volt power source from the coach to the 4Runner. I have towed 3 days in a row without unhooking, with no noticeable problem with a low battery or starting issue. I am at Lake Powell this week, but I will put up a picture of my brake unit with my regulator mod when I get back if you want.
Tad, if your back I would really like to see the pictures of your pressure regulator install and the fittings that you used to put it on the brake master. You could pm me if you like. I would also like to know if you installed the brake switch operated LED that goes to the dash of your coach. The breakaway system?

Rich
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Old 09-18-2019, 11:31 PM   #52
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Hi Rich,

I just got back and will get a pic tomorrow. I did install the red LED brake light on the dash of my old coach. After 6 years and 35,000 miles towing my Jeep, I never had the Brakemaster fail to work or release as it should, so I am not installing it in my new coach. I do have my wife check at hookup to be sure it is working as it should.
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Old 09-19-2019, 11:28 PM   #53
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Rich,

I just sent you an email with some pics attached.
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