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| Truck & Diesel Mechanic Forum - ASE Medium/Heavy Duty Truck Forum :: Forums :: Open Discussion | |||
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 Brake Issue on 09 Cascadia and Utility TrailerGo to page 1 [2] |
| Author | Post |
| LarryM317 |
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 Joined: Wed Oct 28 2009, 04:37PM Posts: 7 | MasterTech_TA022 wrote ... According to what information we have gotten from Ftl on that day the tractor needs to sense a signal from the trailer abs system to allow the tractor protection valve to open all the way. That can't be correct. That means a Cascadia is not capable of pulling a non-ABS trailer? I work for a large carrier with Cascadias and old non-ABS trailers still in the fleet. Not to mention all the trailers with ABS systems disconnected or with malfunctions. The last I knew, the only link between tractor and trailer ABS systems was for diagnostics (dash indicator) not brake performance. | ||
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| RAV4guy68801 |
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  Joined: Fri Sep 18 2009, 10:50AM Posts: 149 | LarryM317 wrote ... The last I knew, the only link between tractor and trailer ABS systems was for diagnostics (dash indicator) not brake performance. Only partially true, Larry. A trailer ABS system receives its operating voltage thru the center pin on the 7-pin socket. Also, guys & gals, keep in mind that most of the "black" trailer power cords that some drivers & fleets buy for their units are not heavy enough wire to support a 30A load on them constantly. If I see a unit with ABS on both trk & trlr & a non-ABS("green" or "red" power cords) and they come in with ABS problems, that is the first thing I check is the continuity thru the power cord center pin. 99/100 times there is no continuity thru that wire due to overloading. But when I install the correct power cord and put an ammeter inline thru that circuit, lo and behold!! that ABs system starts working properly and no active faults in the system. Anything worth doing is worth doing well!! | ||
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ASE Test Preparation Medium/Heavy Duty Truck Series Test T4: Brakes
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