You may want to pull off all the brake drums and check for uneven wear on
the shoes. If the brake linings on one side of the vehicle are worn more
than other side, the less-worn side will engage it's drum before the
more-worn side, causing the Jeep to pull.
If this is the case, you may be able to adjust the more-worn shoes so that
they have the same shoe-to-drum clearance as the other wheels. However, you
should investigate the cause of the uneven wear. This could be the result
of a wheel cylinder that fails to release the brakes fully, air in the line
to certain wheels, mud/sand or other abrasive trapped in the drum from a
previous off-road excursion, broken or worn return springs, etc...
Another possible cause is a leaking wheel cylinder spilling brake fluid (and
thereby lubricating) one of the drums, causing less brake friction on one
side of the vehicle.
I presume that this problem is something that has developed, and that you
didn't recently do brake work on the Jeep. If you have just done brake
work, I would suggest that the brakes just need to be adjusted properly.
I'm not an M38 person, but I know first hand that brakes which are not
adjusted to engage at the same time have a tendency to send you sailing into
a ditch (or oncoming traffic) when you really stomp on the brake pedal.
--Mark Masse
1967 Kaiser M715
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