In the caliper slide pin, that would be the bolts going into part number 3 pictured there. I remember these as being very soft and easy to stretch...they need to be cleaned and re-assembled with a mild thread locking compound and do not get tightened very tight at all, nowhere near as much as the large bolts pictured number 1 there. I do not recall if they were metric or imperial and what grading they were given.
Look for a caliper rebuild kit, you'll probably find some there. Start with other Chrysler group vehicles and then branch into the cheaper lower end Merc benz products.
http://www.jcwhitney.com/omix-oe-rep.../p3064037.jcwx
Omix part 16749.11
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