To your direct question - I don't know the Highlander model in detail, but as a general response, if the brakes are noisy when NOT applied, the piston in your new caliper may not be returning properly.
The return spring in disc brakes is actually the rubber fitted around the caliper piston. If this is causing the piston to be wrongly positioned, the brakes will be noisy. Check that the rotor can be turned by hand when the brakes are not applied. Also check that the piston is not retracting from the pads a very long way, which it should not do.
It is worth making very sure the spring clips are fitted correctly. Some can be easily put in the wrong way round.
If the brakes are squealing when applied, that is a different problem. You can get a disc brake anti squeal liquid, which is applied to the back of the pad on assembly to the caliper. Also double check all the anti squeal shims are correctly installed.
At this range, that's all I can think of right now.
Could be you've reversed the ant-rattle spring? Apprentice did this to me. Just discovered it today.
I had to buy new springs. Won't be going back to that mechanic.
I got the "right way" picture from google image search from here...
WRONG WAY (my picture)
RIGHT WAY
(http://forum.ih8mud.com/threads/disc-brake-anti-rattle-springs.379768/)
NOTE: Removing a small amount of brake fluid from the master cylinder using a turkey baster
Fig. 4: Tighten the C-clamp until the piston reaches the bottom of its bore
Fig. 5: Remove the caliper mounting bolts
Fig. 6: Slide the caliper off the brake rotor
Fig. 7: Support the caliper so that no tension is placed on the brake hose
Fig. 8: Hold the anti-rattle clip while removing the outboard pad (4)
Fig. 9: Removing the outboard brake pad
Fig. 10: Remove the inboard pad and anti-rattle clip
Fig. 11: Removing the inboard brake pad
Fig. 12: Removing the anti-rattle clip
Fig. 13: Install the support spring onto the shoe of the inboard brake pad
Fig. 14: Installing the inboard pad
Fig. 15: Piston extension on new and worn brake pads
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did you use copper grease when fitting the new brakes. also did you clean the runners. another problem could be you have put some air in the caliper end of the brake piston, this can happen when pushing the piston back without taking the top off the brakes filler bottle. and will need to be bleed to get the air out. can also be a warped disc. this can happen if the pads were not changed and it has had metal on metal. hope this helps.
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