I didn't say I thought it was in the front. I said that I had changed the rotors calipers and pads. This is because the rotors were warped and calipers were froze. After the change this problem started.
We still don't know enough! All we were saying is rears will cause the same issue..If you are talking about brake pulsations from rotors...So is that what it is?? You hit the brakes and the pedal pulsates until you stop? Thumping is not a word normally used to indicate rotor runout so I was trying to get more info from you.
If you still have brake pulsations your rotors are messed up again...How long did it take them to go bad?
I thought that it could be a bad rotor or a broken rotor. The new parts were put on. About 500 miles or less sence install. Could be a bad rotor? Just would like to know what to look for next. I checked the rears today and found nothing wrong.
Sure could be if it pulsates until you stop. Check the rotors, really can't be anything else.
Cheap rotors fail quick. Also you could have a bad new caliper...Jack up hit brakes/ let off see if wheels turn easy..by hand.
You could have a rotor that was machined improperly. The reason all rotors pulsate is uneven thickness between the two rubbing surfaces, typically it is worn in. They do not "warp" from heat.
However, you can also have a rear issue as noted, only noticed until now because it would take some time for the new front brakes to bed in and develop full stopping power, so the work balance is thrown towards the rear brakes. The best way to test this is to use a pair of hose pliers to pinch off the drop hose between the frame and rear axle when you are on a deserted road and make a few stops to see if the pulsation is still there with front brakes only.
__________________ Jack - Former Vehicle Test Manager, Friction Products.
03 F350SC 4x4 6.0 Auto 5/30/03
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Thanks everyone for the helpful replies. Jacked up the fronts and spun the tires, NO VIBRATION. Did as suggested and pinched rubber line in the rear and took it for a ride. NO VIBRATION. Found a cracked rotor in the rear!!!!!! Also one of the calipers was froze. Brake pads are rusted in place. Thanks again everyone!!!!
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