Here is the scenario. I replaced front and rear brakes due to the front ones were worn, back shoes never replaced. Had both rotors and drums turned. installed everything and noticed a "pulse" in the brake pad. No shimmy or steering wheel shake, just a slight pulse in the brake pad. Replaced both rotors and drums. No help. Replaced front wheel bearings and seals. No help. Rotated front tires to the back. No help. Bled brakes, no help. The only thing that I have noticed is the drivers side brake caliper is tighter on the rotor than the passenger side, like it does not release all the way. You can still spin the rotor but it does drag a bit. Looking for other ideas. The truck stops fine with no pulling. 97 F150, 5.4. No problems before the brake job, just worn pads.

 

The calipers dont retract automatically when you let off the brake, there is not a spring to pull them back in. It actually uses the slight wobble inherent in the rotor to push them back slightly as well as little free play in the slide and pads. If the caliper piston or slide does not move free enough you will get that slight pulse.

I would thoroughly clean the caliper and the surfaces on the mounting. I clean it will a wire brush and sand paper. I would also check the bolts to be sure they are greased and move easily.

 

Thanks, I did lube the slides when I originally replaced the brakes. I will see if I can clean the pistons to see if that helps. I am open to anything at this point.