I'm changing a front whell bearing/hub assembly on 2003 yukon xl 1500 4wd and need to know if the brake caliber is pressed on and off or if I can remove it without a press?

the front wheel bearing hub?
XL-7 (the dash matters)
my wild guess, is the questions was
what are all steps to do this job. and tools.
that?
RTM?

https://suzukipitstopplus.com/Products/10056-2002-grand-vitara-xl-7-service-manual.aspx

http://www.fixkick.com/hubs/FW_BEARINGS.html#newer
the link shows all years, and variances.

here is a photo review, that is accurate up to
1998, and beyond , if you skip the bearing service parts. as yours are INTEGRATED
and NON-serviceable.
http://www.fixkick.com/hubs/FW_BEARINGS.html


the photo 6a and B
shows removing the hub,
so do that , buy a new hub and put it back
the same way, using the tool stated
at the stated ranges of torque
123-180 ft/lbs.
this range allows you to get the screws into the locking rings.

Who put the front brakes an wheel hub bearing on the vehicle ? A qualified repair shop ? A friend ? The front brakes an wheel hub would have nothing to do with the brake lights . An the brake light switch is an input to the BCM - body control module .
Stop Lamps
When the driver presses the brake pedal, the switch contacts open and battery positive voltage is interrupted to the BCM. The BCM then supplies voltage to both the turn/stop lamp supply voltage circuit and trailer rear turn/stop lamp supply voltage circuits. The BCM also supplies voltage to the CHMSL though a dedicated circuit.
I suggest you take it back to who did the front brakes , or a quailfied repair shop .
DTC B3445 00: Stop Lamp Circuit - DO you know what a DTC is ? diagnostic trouble code !
Diagnostic Fault Information
Circuit
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
Stop Lamp Supply Voltage
B3445 00
--
Stop Lamps Inoperative
Stop Lamps Always On
Circuit/System Testing
Disconnect the stop lamps and test the individual stop lamp assemblies for internal shorts between all terminals.
? If a short between terminals is found, replace the stop lamp socket or circuit board as applicable.
Test the stop lamp supply voltage circuit for a short to ground.
? If all circuits/connections test normal, replace the BCM.

155 Ft/Lb is the correct Torque

http://www.speedwayautoparts.com/Torque%20Specks.pdf

It comes as a bearing hub and assemble, As for applying grease its sealed

front wheel bearings going bad. this is common. the speed sensor is part of assembly. it will get real bad and you will have no brakes at low speeds, turning is worse. replace both front hubs. not cheap but will save headaches

Replacing the front wheel bearing/hubs can be a big job for the inexperianced. Briefly...
Remove tire/wheel
Remove brake caliper assembly, do not remove brake line.
Remove caliper bracket.
Remove brake rotor.
Unplug ABS sensor.
Remove the large axle nut.
Press axle out of bearing (may need special tool)
Remove the 3 bearing bolts and remove bearing.

Honestly I wouldn't attempt to do this unless your a trained automotive technician, hub bearings are... a b#&ch without the right tools

do not replace only the bearing. replace hub assembly. remove rim/tire , remove caliper, mounting plate, rotor. . un bolt hub assembly, unplug abs. remove front axle nut if 4x4. you may need to rent the axle nut remove kit and hub puller. pull out hub. drive axle reward out of hub. install new part. do not torque hub over 90lbs. check with parts sell for spec

worn out hub bearing. do not drive anywhere but to get it fixed! Jack up grab wheel at 12 and 6 and rock it ,loose aint it.

u will need to remove the brake cailper and the the brake rotor, then the hub retaining nut, that is a large metric nut, the bearing and hub must come off, then u will need to take this hub to a machine shop or the dealer and have the new bearing pressed in.
BCA/NATIONAL Part # 510078 {Ball Bearing Bore=1.5354" Outer Diameter=2.9134" Width=1.4173"}
Front Wheel PRICE: $47.99, PART SOURCE: Rockauto.com