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Old 05-08-2012, 08:52 AM
rgrindle rgrindle is offline
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Default Rotor Question

2003 reg cab 3.0 5 spd. I have replaced my front rotors at least four times in the last 100k due to the rotors warping and causing annoying pedal pulsating. I have tried different brands of rotors but always at around 10k the pulsating starts and gets progressively worse with mileage. I never tow or haul anything and usually downshift when coming to a stop. No hills to go down so I cannot believe it is due to heat. I have also tried different types of pads. Do I need to purchase the most expensive rotors or? Thanks!
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Old 05-08-2012, 09:20 AM
awjuhl awjuhl is offline
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Did you condition the pads and rotors when you installed them?? Have to go up to 45mph 3 times and gradually come to a stop this sets the groves for the pads to ride on and sets the temper for the rotors panic breaking is a another way of warping rotors or over torque the lug nuts can as well
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Old 05-08-2012, 09:45 AM
RoberticusMaximus RoberticusMaximus is offline
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Default Re: Rotor Question

they say that if a caliper is bad, that can contribute.
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Old 05-08-2012, 10:11 AM
sgtsandman sgtsandman is offline
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Were your rotors and pads completely clean? If there is any grease on either, the pads could leave residue on the rotor, which will give pedal pulse like a warped rotor.

Or, do you brake lightly all the time? Sitting at an intersection with hot brakes can leave residue on the rotors as well. You don't have to come to a hard stop but slow easy braking will heat up your brakes a lot more than moderate braking will.
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Old 05-08-2012, 10:39 AM
BILLIBOY BILLIBOY is offline
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Default Re: Rotor Question

Before installing new rotors, the hubs should be checked for run-out with a dial gauge. There should be very little run-out on the face of the hub that the rotor sits against. The face should be buffed clean and coated with never seize compound. Put the rotors on, install a couple of nuts upside down and again check for run-out. Also check for even rotor thickness all around the rotor with a micrometer. There are specs for these measurements. If out of spec at the start they will only get worse with use.
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Old 05-08-2012, 01:52 PM
charlie07 charlie07 is offline
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Old 05-08-2012, 01:55 PM
merlin215 merlin215 is offline
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Default Re: Rotor Question

Quote:
Originally Posted by rgrindle View Post
2003 reg cab 3.0 5 spd. I have replaced my front rotors at least four times in the last 100k due to the rotors warping and causing annoying pedal pulsating. I have tried different brands of rotors but always at around 10k the pulsating starts and gets progressively worse with mileage. I never tow or haul anything and usually downshift when coming to a stop. No hills to go down so I cannot believe it is due to heat. I have also tried different types of pads. Do I need to purchase the most expensive rotors or? Thanks!
what kind of rotors and where did you buy them ? The most common cause of warped rotors is heat . Did you buy the rotors at the same place all 4 X ?
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Old 05-08-2012, 02:10 PM
01_ranger_4x4 01_ranger_4x4 is offline
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Default Re: Rotor Question

The most common reasons Ive found for warped rotors are uneven/ over torqued lug nuts, brakes not bedded/ broken in after replacement and cheapo pads. OEM style rotors for the most part are pretty much created equal, they are made of cast iron and unless they are a bad casting or not machined right they will not be prone to warping on their own. My advice, buy quality pads, bed them in according to the manufactures instructions and torque the wheels evenly to fords specs.
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Old 05-08-2012, 06:15 PM
rgrindle rgrindle is offline
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Default Re: Rotor Question

Thanks for the advice. The last time I installed new rotors, I ordered Motorcraft rotors and pads but got a call from the shop saying they sent me rotors for a 4 wheel drive. Had to get aftermarket locally as the work was in progress. More complicated than I thought. Next time I will try a brake shop or the Ford dealer.
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Old 05-08-2012, 06:31 PM
Rangerman49 Rangerman49 is offline
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Default Re: Rotor Question

Quote:
Originally Posted by BILLIBOY View Post
Before installing new rotors, the hubs should be checked for run-out with a dial gauge. There should be very little run-out on the face of the hub that the rotor sits against. The face should be buffed clean and coated with never seize compound. Put the rotors on, install a couple of nuts upside down and again check for run-out. Also check for even rotor thickness all around the rotor with a micrometer. There are specs for these measurements. If out of spec at the start they will only get worse with use.
This is GOLDEN advise. The only thing I would add, use a torque wench to tighten the lugs in a STAR pattern !!
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Old 05-08-2012, 06:50 PM
sgtsandman sgtsandman is offline
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X2 on the torquing. Very important.
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  #12  
Old 05-14-2012, 06:01 PM
jenwhite jenwhite is offline
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Default Re: Rotor Question

rotors
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