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Automotive HD/Fleet Forum

Professional automotive forum for discussion of heavy-duty trucks, buses and other on- and off-road equipment, and maintenance of automotive fleet vehicles. Discussion topics include fuels and lubricants, hydraulics, performance, on-board diagnostics, powertrain, power distribution, anti-lock braking and stability control systems, and best practices as they relate to heavy duty and fleet maintenance. This forum is for experienced automotive repair professionals only, membership required.

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Recent Automotive Discussions in the Automotive HD/Fleet Forum

Rapid rear brake pad and rotor wear
05/24/2013 in the HD/Fleet Forum
[Brakes: 05 Chevrolet Silverado 3500 6.0L] Friends, This truck is owned by the local school district maintenance department. They claim they have four of them that all have the same issue: Rear brakes wear out in less than 6k. I do not service their vehi...
1995 cummins m11 missing
05/24/2013 in the HD/Fleet Forum
I have a 95 freightliner fld 112.[...]. With a cummins m 11. serial [...]. the complaint is that there is a miss on up-shifts. I test drove empty and the miss is around 1100 to 1800 rpm in high range. Idles smooth, and the miss goes away at higher rpm. Pu...
M-2 brake lights
05/24/2013 in the HD/Fleet Forum
On a '07? Frieghtliner M2 , the brake lights are stuck on. Unplugging the switch for it on the air control module they still stay on. Is this switch normally open or a normally closed type? I'm thinking for a safety issue, it might be a N/C type that feed...
Meritor 3219 Drum Removal
05/23/2013 in the HD/Fleet Forum
Anybody have any tips on how to remove this brake drum? 39K stuck on steering axle driving hub(4x4). Had to die grind and crack other side. Over $500 each so I want to try to save this one. Backed off slack and roller came dislodged. Can some type of ...
Exhaust Manifold Bolt Broke/Whistle
05/23/2013 in the HD/Fleet Forum
[Engine: 08 Ford F-450 Super Duty XLT 6.4L] This 6.4L has the left side rear lower exhaust manifold bolt broke, as near as I can tell it is broke flush with the head or just past. Any tips on this job? Have you diesel techs had luck getting these bolts o...