Mechanics

Y DOSE BACK TIRES LOCK UP

2003 Ford F-250 • 200,000 miles

"i have a 2003 ford f250 super duty diesel truck I can put it in drive and drive 10 to 40 yards then back tires lock up and will not move till I put it in reverse why is it doing this and what do I have to do to fix the problem"
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Missygean
February 12, 2012.



Try backing off the self adjusters and see what happens

Rasmataz
Feb 12, 2012.
If it backs up okay we can probably rule out an axle problem. A common cause of drum brake lockup is a leaking axle seal. Gear lube gets on the shoes and drum and makes a sticky mess. If you're on a dirt road or driveway, the clue will be only one rear wheel skids. Both might if you have a locking rear differential, (positraction was GM's name for it).

Ford has also had way more than their share of parking brake cables rusting tight. If one is just sluggish, it will not release fully under return spring pressure. That will hold the shoes out and make them grab easily. Most commonly that affects the left rear brake going forward and the right rear going in reverse on those Ford models where the right cable goes all the way around and comes in the from the back.

Caradiodoc
Feb 12, 2012.