As for brakes, we use Autozone gold pads and the lower rotors. We always buy pads and rotors as a set. For cars $79.95 and trucks / SUVs $99.95. I'm not sure if all the gold pads are made by Bosch, but I know some are. I can't remember if we ever had a come back for squeaking, but every now and then we will have a come back for pulsation. Been using them for 5 yrs come next month. Radiator and AC parts we use Performance Radiator. We are their #1 buyer in SE Louisiana area. I know this bc I received a phone call from corporate thanking us for our business. Not too many warranties from their parts, acceptable I would say. We do have a lot of comebacks for remanufactured alternator and starters, whether it's NAPA or AZ. I don't keep track, but it may be about 20% to 25%. I try to get the new ones from NAPA or AZ if available. Not too many new ones come back. Ignition coils. Almost every one seems to come back for Nissan and VW coils from AZ. I try to get the Atrom brand from NAPA when available. Sent from my iPad using Tapatalk