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06 Lucerne (Rear caliper mounting bracket bolts)


JohnO
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I have spent a couple of hours on these and only got one off. The bolts require an enormous amount of torque just to turn them after I got it started. I do a couple of turns and have to take a rest. What is causing all that resistance and is there an easier way? I have been using a 3/8 inch ratchet with a 15mm socket. If something else works better please let me know Thanks.

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It may also be a clue to where the car has lived..... I suspect in the rust belt. 

You might also want to check what bolts it uses.... many newer cars are using those torque to stretch bolts that cannot be

reused.    

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13 hours ago, JohnO said:

I have spent a couple of hours on these and only got one off. The bolts require an enormous amount of torque just to turn them after I got it started. I do a couple of turns and have to take a rest. What is causing all that resistance and is there an easier way? I have been using a 3/8 inch ratchet with a 15mm socket. If something else works better please let me know Thanks.

A breaker bar may make easier or even an  Impact gun. PB blaster will help get into the threads and loosen them.

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Try alternately loosening then tightening.  There's a couple of threads that are exposed when the bracket is tight and the exposed threads will corrode.  Going back-and-forth usually helps chase the threads.  Some penetrating lube will also help.

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22 hours ago, EmTee said:

Try alternately loosening then tightening.  There's a couple of threads that are exposed when the bracket is tight and the exposed threads will corrode.  Going back-and-forth usually helps chase the threads.  Some penetrating lube will also help.

EmTee is right on target, and a good penetrating lube such as Kroil or Tri-Flow (much better than WD-40) in between reversing direction-

cannot imagine that they could be left-handed threads? but have seen folks unaware of left hand lug nuts on 1950s-1960s MoPar products

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