30 minutes to an hour if you have the right tools...and the rotors are in good shape or you are replacing them...
1.put truck on jack stands and remove wheels
2.unbolt calipers (hammer and box-end wrench, or impact wrench)
use small C-clamps to compress the pistons back in.. (note you will prolly overflow the brake reservoir if it is already full). Also remove the clip holding the brake line to the chassis so you can slide things around and not have to open up the brake system
3.pull the pins and springs and the pads..
4.clean everything good especially the rods the brakes ride on
I use some high temp grease on the rods VERY thin coating... i.e. wipe it on wipe it off...
5.prep the new brake pads...
I file a 45 degree angle on the leading edgefor about 1/4" or so if they aren't already done to prevent chipping and put stop-squeal on the backs of the pads
6.replace the rotor if needed... or have them turned.. or leave them and realize it will take time to seat the new pads and braking actions will be a little weak the first 50 miles or less
7.re-assemble everything... bleed the brakes if they need it or if you opened the system..
and yer done take it easy until the pads are seated good in any case
Least that is the way a shade tree parts replacer does it...
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