2004 Buick Rainier Questions

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Sometimes rear air suspension goes down overnight and will fill back up when vehicle is started. Compressor and air bags work properly and can find no leaks.
on occasion my 2004 ranier rear end sags to the ground.......usually the air compressor will blow up the suspension bags when ignition switch is turned on, and it will be fine for 2-3 days, then will happen again. I do not believe the air bags are leaking, since they stay inflated for days after the problem, and the air compressor is functioning as well. Is there a valve between the air compressor and air bags that coule be malfunctioning? as expensive as repairs are for this, I want to fix the right thing/ please advise.
When I come to a stop it sounds like medal to medal, on both sides of my front brakes. I have had both front bearings and hubs replaced, all new brakes installed. But still sounds like medal to medal
and is very loud.
I disconnected the ABS and
the grinding stoped. I still have good brakes. Do I have to replace the whole ABS system? What do I do?
The rear end of my 2004 Buick Rainier is sitting low. The air pump comes on but nothing happens. If I try using the air outlet on the inside of the cargo bay, I don't get any air. Would this be a sign that the pump is dead or that there is a leak in the air bags and/or air lines?
We tested the blower moter and it's good it worked on the feet and windshield for awhile now that doesn't work either
also, grinding in front left wheel. bearings? what size socket needed . its a large nut .
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