TheJDMAsian
05-17-2008, 07:27 PM
So you have a Brake Pedal Pulsation. First step is to identify which are the warped rotor is comming from front or rear.
At Mild speeds 30-40mph apply light brake pressure increasing the pressure until you get pedal pulsation. Dose the steering wheel osolate (shake). If not Accelerate to speeds around 60 mph and brake harder and check for a steering wheel osolation agen. Be sure not to brake hard enough to where the ABS system will engauge. If the wheel dose not osolate You have verified that the front brakes are not the cause of the issue.
Checking rear rotor for at slow speeds of 10-20 mph apply the e-brake lightly so as not to lock the rear wheels up. If you feel the e-brake pulsate then your rear rotors are warped.
Another method could be is to take a Brake rotor micromiter or digital/dial gauge and measure around the rotor in 6 places 3 times. Measure next to the hub at 12 2 4 6 8 10. Next Repeat this in the middle of the rotor and them agen around the outside edge of the rotor. If your run out is more than .05 You will have a noticalbe pulsation.
Another test you could do which is much quicker is measure the run out of the rotor with a dial run out gauge. Attack the gauge to a stationary object such as the hub and be sure to preload the gauge. Slowly turn the rotor and mark the minimal and maximal position the dial goes to. Same spec as above more than .05 will be noticable run out.
At Mild speeds 30-40mph apply light brake pressure increasing the pressure until you get pedal pulsation. Dose the steering wheel osolate (shake). If not Accelerate to speeds around 60 mph and brake harder and check for a steering wheel osolation agen. Be sure not to brake hard enough to where the ABS system will engauge. If the wheel dose not osolate You have verified that the front brakes are not the cause of the issue.
Checking rear rotor for at slow speeds of 10-20 mph apply the e-brake lightly so as not to lock the rear wheels up. If you feel the e-brake pulsate then your rear rotors are warped.
Another method could be is to take a Brake rotor micromiter or digital/dial gauge and measure around the rotor in 6 places 3 times. Measure next to the hub at 12 2 4 6 8 10. Next Repeat this in the middle of the rotor and them agen around the outside edge of the rotor. If your run out is more than .05 You will have a noticalbe pulsation.
Another test you could do which is much quicker is measure the run out of the rotor with a dial run out gauge. Attack the gauge to a stationary object such as the hub and be sure to preload the gauge. Slowly turn the rotor and mark the minimal and maximal position the dial goes to. Same spec as above more than .05 will be noticable run out.