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Old 07-12-2009, 09:02 AM   #1
4 Rivet Member
1986 32' Excella
vledder , drenthe
Join Date: Sep 2003
Posts: 411
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unequal braking

Yesterday we worked on the brakes of a frend's airstream.

All 4 magnets replaced.
Plug was coroded so replaced.
Brakes adjusted to the point that you can just hear and feel them drag a little.
Cleaned drums and lining with the nastiest brake cleaner we could find.
Between the white ( ground) and the blue ( brakes ) wire we mesure 0,9 ohm.
That schould be ok i gues ( That's about 13 amps at max braking )
With the brake controler set @ max onley 1 wheel locks up.
When aplying the override on the brake controler you can fel that the airstream does brake but not real hard.
The brake controler is wired to the car with the standard GM conector.

I am thinking of conecting the ground from the plug on the TV straight to the battery ground.
and maby also replacing the brake wiring on the airstream.

Any other idea's

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Old 07-12-2009, 09:25 AM   #2
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2002 25' Safari
Dewey , Arizona
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It sounds like just one brake is working. Did you verify that power from the brake controller is getting to all 4 magnets and that the return line is grounded on all 4 magnets?


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Old 07-12-2009, 09:43 AM   #3
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1991 34' Excella
Princeton , New Jersey
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I would start by taking a voltage reading at the input of each magnet and both sides of the trailer plug and at the controller output. If it is the drivers side front wheel that is locking up it sounds like you have a voltage drop problem.

If you see a drop of more than 2 volts through the system I would start by upgrading the wiring where the drop is most noticeable.

Another point to test for a drop would be from the magnet output to battery ground with a piece of #12 or larger wire leading to the battery. Any voltage reading here is a problem in the ground path.
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

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Old 07-12-2009, 09:49 AM   #4
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1966 24' Tradewind
Placerville , California
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Before my replacement of my axles I had one brake was engaging first causing that one wheel to drag on soft surfaces. All the other 3 brakes worked, just not in a timely manner. My only solution was to loosen the adjustment on the dragging brake.
Neil and Lynn Holman
FreshAir #12407

Kirk Creek, Big Sur, Ca. coast.

1966 Trade Wind

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1969 Oldsmobile Ninety Eight
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