WOLFWALKER Posted October 11, 2009 Share Posted October 11, 2009 I am use to the old mack slack adjusters with the hex head for adjustment, but the 1975 R model I just got does not have any thing there but a little stub that you cant get a wrench on it.How do you adjust the slack adjusters on this model truck? She's alittle hard to stop with a load and I can't seem to figure out how to adjust them. Quote Link to comment Share on other sites More sharing options...
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