Welcome to the forum
you
1) furnace- probably the igniter/flame sensor.
2) Brakes- should be self adjusting. Take it out and do about 30 MPH, then brake hard. You may have to do this a number of times. If they are self adjusting they will only adjust going forward, opposite of the old car brakes.
Glad you like your new rig, both issues should be a warranty item, so you may want to contact your selling dealer. There is a short time ( I think 60 days) on brake adjustment.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.