When my 4Runner is going over thirty or down hill and I apply the brakes, it rattles pretty hard. I've taken it in and they say that they think it's the rear brakes but can't check because they are covered somehow. I don't know much about cars and there's not really anywhere in town that I trust all that much, does this seem like the problem and if so how much does it cost to fix? Thanks.
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If the sound stops when you lightly apply the brakes it is probably disc brake pads that weren't properly installed and they are rattling now that they are worn down. There should be a clip and disc brake quiet that keeps them attached to the piston cup of the caliper. If not they will rattle back and forth in the distance between the caliper cup and the rotor when the brakes are not applied.
the squeaking sounds like a wheel bearing going bad. And the pulling to one side is cause by unequal braking pressure caused by plugged rubber brake hose, bad calipers or wheel cylinders. Check the bearings by lifting the car with a jack, block the wheels, and use a jack stand for safety. now wiggle the tire around. If it has any play, the bearing is bad. Replace it. I would replace your brakes as well. Good luck
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.
Try some engine cleaner and that will help improve rough idle and or performance. To me it sounds like a possible motor mount issue. Sounds like the front engine mount. Because you explained up a hill rattle. / Down Hill\ no rattle. Engine lifts when going up hill and shifts downward while going down hill. hence no vibration because of gravity pull and the weight of the engine.