Hey gang, got a 2001 screw, 4.6 2wd. When I am braking, the rear of the truck bounces bad. You can look in the rearview and see the bed hopping. I checked the pads( GOOD ) no groves in rotors (They look good) I have never gotten them hot, no hard braking. Would these just warp over time? No vibration in the pedal and front seems ok.

 

Mine warped after i drove my truck through a river on a hunting trip. Im sure some crap got in there and completely destroyed them. When i would brake, the whole truck would vibrate violently. It felt like it was going to fall apart.

 

Joker,
Do you have any vibration in the brake peddle or steering wheel? Usually warped rotors in front cause steering wheel vibration, and rears cause peddle vibration. How much brake fluid is in your reservoir? Sometimes the fluid gets low enough to suck a little air in the lines when the pads wear down over time. Then you get pressure pulsing in the system.

 

A little vibration in the wheel but I haven't noticed any in the pedal. The back literaly hops when I brake.. ??????

 

I would say that they are warped. Though you may have not been hard on them, they still heat up and cool every time you brake. Heating and cooling warps metal, period.

I would replace (or resurface) the rotors and pads.

I DO NOT see how in the world that low brake fluid would make a truck vibrate like that and have never heard of a closed brake line system getting low letting air in the line. Yes, if you ran the MC out of fluid it would get air in the lines, but, just low I don't see it.

 

Thanks guys, I will replace them this weekend.

 

I didn't think about it but when I just replaced my rear bearings and seals, along with the worn right rear axle, presto! no more bouncing while breaking. turns out it was a severly worn axle and bearings. Just a thought for future problems like this.

 

Glad you got it fixed.

Also, you can over-torque the lugs making it feel like the rotors are warped. The Ford place did this to me last time I had a R&B.