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Old 03-21-2006, 07:38 PM   #1
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Question two axles, different brakes

I've seen posts that "alledge" that some of the bigger [older] trailers have been found with electric brakes on one axle and hydraulic on the other. I am completely befuddled by this setup.

What is the purpose?

How are they harmonized?

Was there some kind of strange brake controller used for this setup?

If you were doing a new set of axles, would you repeat this arrangement or go one way or the other, totally?

If you did mix the brakes, is a special brake controller required?
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Old 03-21-2006, 08:05 PM   #2
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The brakes worked with one axle working from the hydraulic brakes on the tow vehicle (not clear if the brake fluid actually flowed between them) and the other axle with the big resistor spring under the hood and handle on the dash. Supposedly this was a simultaneous actuation.
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Old 03-21-2006, 08:06 PM   #3
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My 63 Overlander came with this setup. There was a master cylinder type device on the tongue, which tied into the rear axle brake line on the tow vehicle, if I understand correctly.
The other axle had conventional electric brakes.
I have no clue what they were thinking back then. I guess progress had to be made somehow, so perhaps that was the starting point?
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Old 03-21-2006, 08:27 PM   #4
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Quote:
Originally Posted by uwe
My 63 Overlander came with this setup. There was a master cylinder type device on the tongue, which tied into the rear axle brake line on the tow vehicle, if I understand correctly.
The other axle had conventional electric brakes.
I have no clue what they were thinking back then. I guess progress had to be made somehow, so perhaps that was the starting point?

It was a "dual system".

Actually, if it was hooked up correctly (most were not), it worked rather well.

Also it was a transition between hydraulic brakes and electric brakes.

Problems were many, in that your had to have an electric brake controller and also tie into the hydraulic system of your tow vehicle brakes, at the rear axle.

Royal pain.

Andy

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Old 03-21-2006, 08:43 PM   #5
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HI Andy, How did they tie the two hydralic together Andy without getting air into the system?
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Old 03-21-2006, 08:55 PM   #6
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An umbilical hydraulic hose was connected to the tow vehicle, permanently.

The trailer end had a metal fitting that was held in place on the master cylinder that was on the front of the trailer, with a clamp.

I have an oldie here. I will post a photo of that arrangement tomorrow.

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Old 03-21-2006, 09:27 PM   #7
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Thanks Andy, I look forward to seeing that photo, thanks again..
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Old 03-22-2006, 10:55 AM   #8
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Photo of the old hydraulic master cylinder and clamp, that Airstream used many moons ago.

Andy
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Old 03-22-2006, 07:53 PM   #9
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Thanks Andy I can see were that would be a real pain, thanks again Andy..
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