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to answer your Q.
YES, that is normal. And YES shims should always be used.
the best way to ensure quiet brakes is to follow these steps when servicing disc brakes:
1. use at least 1 shim per pad. in your case you have 2, choose the coated over non-coated if you have a choice. you can use both, I would place the coated on the piston side.
2. use plenty of moly-lube grease, works much better than syl-glide and lasts longer and performs better under high temps.
3. put the lube on the friction surfaces (top tabs of pad, back, then place the shim on it, then on the back of that shim, then the other shim, then on the back of that shim.)
4.use brake clean to clean all parts well before lubrication and installing new parts and to clean off your hands/gloves after getting them all dirty from the moly lube.
One key thing to remember is not to spray the brake clean on the newly lubed parts, this will shorten the longevity and usefulness of the moly lube by drying it out.
Hope this helps!!!
Chuck in mpls,
(ASE Certified in Brakes and Electrical!)
--
'88 244 174K, '87 BMW 325e 180K (used to feed a '84 245, '84 244, '85 744)
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