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Old 07-25-2009, 07:41 AM   #1
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Hot towed vehicle brakes days after towing

I have an SMI brake controller which has a box with vacum pump which sets on the floor of the car.
I've had this installed in two different cars and two different motor coaches and in all cases, after towing and disconnecting the car the car brakes run hot (325 degrees) for a couple days untill they seem to settle down and run at a tempture of around 165. SMI is baffeled by the problem. It seems that after towing and using the car brakes there is a residule vacum which the use of the car brakes add to and it takes a couple days for the excess vacum to bleed off.

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Old 07-25-2009, 10:55 AM   #2
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Interesting....What kind of toad are you using it in? Have you tried bleeding the air off of the box?

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Old 07-26-2009, 04:39 AM   #3
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I have had the problem with tow cars. A 2004 Jeep Liberty and a 2006 Jeep Commander. After towing, I remove the box and I still have the problem for two or moe days.
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Old 07-30-2009, 01:50 PM   #4
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I don't understand the brakes running hot. Are you saying the the pads are dragging (i.e. the pads are running or rubbing against the rotor) and it takes a couple of days for the pads to move away from rotors? Very interesting indeed. I trust you've driven the cars both directions. Seems the pads need to move away from rotor.

How are the brake temps when towing the vehicle? Just trying to get more data.

A poser.

Last thought: If excess vacuum is the problem, have you tried pumping the brakes with the engine off to deplete the vacuum. Don't know how Jeep brakes are engineered. This method would not work well on my Ford F 52
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