Hi
I've got a 2000 windstar, 44,000km on it. When applying the brakes there is a pedal pulsation and a audible "dub dub dub" sound which slows as the van decelerates to a stop. Now a while ago I took the calipers off, check the pads, lubed the sliders etc and things looked good. I did notice a tiny bit of this same sound and slight pulsation but had put it down to the oil guy who rotated my tires and using an air gun to reinstall the tires. When I reinstalled the tires after the brake work and torqued them properly the sound seemed better. Now that I've got my snow tires on the sound/feel is more obvious.
So, I'm wondering if the rotor is warped and how to diagnose this. I understand that if it is really warped it'll be quite noticable (rusty spots, obvious bend etc.) but if it is slightly warped will placing a straight edge on the rotor be able to tell the warping?
What is the best method to do this?
Cameron