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Old 09-01-2011, 04:29 AM
JFK JFK is offline
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Exclamation front brake issue

I installed new front calipers, rotors and pads. When applying the brakes grab with appropriate force for 3/4 of the rotation of the wheel and the other 1/4 rotation grabs really hard, likelihood the rotors are warped. You can feel this in the brake pedal. I have checked the rotors for true with a dial indicator and they are true. I also checked the calipers and both pistons seem to be engaging at the same time. Does anyone have any ideas as to why this is happening?
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Old 09-01-2011, 05:36 AM
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Did you do a brake pad break-in?
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Old 09-01-2011, 05:57 AM
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"Warping" rotors is a myth (as you've discovered with a dial indicator) and while it may have applied to "single-plane" rotors it has nothing to do with the finned, dual-planed, rotors your truck has...

It's caused by the surface of the rotor being different is some spots than others (cutting the rotor resurfaces it, fixes it, so people think it got re-trued because it was warped) BUT it's the new, even, braking surface that it needed.

So, you can try to give it a new surface yourself with a DA and some 80grit or, if you have to, it can be resurfaced on a brake lathe (NOT if it's drilled though)

Term3 has a good point, did you bed the new pads when installing them? If not, you can deposit pad material on the rotors and actually cause the pulse.
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Old 09-01-2011, 09:26 AM
JFK JFK is offline
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yes i did a break in. this 'pulsing' was happening during break in. during the break in the pulsing was bearly there for the first and second time i applied the brakes. after that the pulsing was bad but seamed to get better after subsequent braking but is still there. should i have the rotors turned again?
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Old 09-01-2011, 10:52 AM
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Take 'em out and Heat 'em up (you should actually be able to "smell" brakes if you did it right) but not Too hot

6-7 moderate stops in a row from 50 to 5 without stopping. Might be all it needs.

How did you do the break-in?
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Old 09-01-2011, 06:50 PM
JFK JFK is offline
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I actually did 8 to 10 hard brakes from 50 - 60 down to about 5 or 10 mph. i tried to do them one right after the other but conditions not accomodating. the longest between brakes was about 3 or 4 minutes. The pulsing started immediataly then after break in seemed to be minimal perhaps dissapearing but after normal driving the pulsing seems to worsen.
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Old 09-01-2011, 06:52 PM
JFK JFK is offline
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can i just do another break in or do i need to turn the rotors and clean the brake pads and try again. i have never had such problems. usually just hard breaking 4 or 5 times and good to go. wth!
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Old 09-02-2011, 06:07 AM
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They should re-bed, give it a try!
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