I thought I'd start a new thread to go over my experiences and not garble up the other towing brake thread anymore. I have a 2014 Tundra with 121k miles. I just replaced the front pads/rotors for the 2nd time. I bought the truck new. First OEM set of pads/rotors were replaced about 65k miles. I was experiencing fairly bad shake/shimmy when applying the brakes, especially at highway speeds. I bought the PowerStop Z36 drilled/slotted rotors and Z36 pads, I re-used the OE clips/springs and caliper pins. I did not re-use the OE shims. I did completely wire-brush/wheel the rotor mating surface of the hubs, taking care to really get all the rust off and make the surface smooth again. I put some copper anti-seize on the mating surface on the hub. Being in the Southeast, rust is not a major issue. There was some rust, but nothing crazy. As I said, I re-used the "anti-rattle" clips (springs) that are the only means of spreading the pads back off the rotors when braking is not used. And there's only ONE of these springs/clips on each caliper/pad set. There's not any real service data/instructions anywhere that say to replace these clips. And certainly none of the Youtube videos show anyone replacing them with new. Fast forward 60k miles and I'm suffering the same, maybe worse, shimmy/shake when applying the brakes. I'm even seeing / feeling a rough ride/vibration at certain highway speeds. Road force balancing made most of it go away. I replaced the Powerstop pads/rotors with new Toyota OEM pads, rotors, shims and bought a new anti-rattle/spring kit. It only included two springs. I re-used the original two and put the new springs in, one on each caliper. The new springs are much larger/robust than the OE springs, at least it seems that way. I'm going to buy another set, take the wheels off, and put a new spring on each caliper where I've re-used the old springs. Both calipers will then have 2 new anti-rattle clips (springs), pushing the pads back on both ends when the brake pedal is not applied. I think this lack of a second spring (anti-rattle clip) is the problem with the front rotors warping prematurely on the Tundras. There is no reason the PowerStop products should have had problems. There is no reason the Toyota OEM rotors/pads should have problems. These are STOUT, Made in the USA products. 4-piston calipers, LARGE calipers, rotors and pads. This is on the verge of heavy duty 3/4 ton truck components. I also saw very poor performance from the brakes I put on our 2011 Sequoia. All the same components, same problem except at 35,000 miles, the pads and rotors were SHOT. I replaced the pads, rotors, ALL hardware. We sold that vehicle about 5k miles later, so I don't know how it's doing now, but I bet it's better than it's ever been. So to boil it down, if you are having the warping problem with your Tundra, Sequoia, etc., try putting in 2 sets of springs on the pads. Also....for the love of all that's good - when you are pushing the pistons back in the calipers.... PLEASE get your 10mm wrench out, a 1/4" clear plastic hose, old milk jug and open the bleeder screw up and push the old fluid OUT into the jug and NOT back into the brake lines. It's 100 times easier to push the pistons back in and you're not pushing old fluid back into your system. Refill the master cylinder reservoir, then do the other side. Finally, bleed the system out 5-6 pedal pushes and put some new fluid in the system. I think I'm on to the solution, tho. I re-set my MPG monitor on the dash this morning. Generally, I have been averaging 15.5 MPGs for YEARS. I have a 65 mile commute a couple days a week. This morning it's showing 16.7 MPG after the reset. I'll report back after a week or so and let it settle in.