JAG IRS brake shudder

[ollykiwi3]

been a while.time for an update.
still cant figure this thing out.
have pulled the the diff out and checked caliper mounting alignment and disc runout. again, all seems ok. parallel and runout below .004"

down to last few theories.
1) change pad material and brand

2) pad to caliper free play is .016" in direction of rotation. not sure if this is too much. its possible the pad is doing what I suspected at first and gripping ,being driven against the lower stop, letting go bouncing back, gripping etc and so on several times a second until it gets more load on it to hold it solid.

3) have found the stub axles spline with a bit of wear. wondering if the are chattering inside the diff centre with certain load on it and pivoting off the stub axle bearing? have the early series 2 ball bearing stuba xles if that makes a difference.

still cant believe im the only one experiencing this.

[RICK LAKE]

ollykiwi3 Olly out of round for a rotor should be under .002" Balance of the rotor should be "0". Does your car have a parking brake. Go for a road test and at 30 mph stop the car with just the parking brake. Pull up on the handle lite. If you have a pulsation it's in the rearend. If you have no pulsation. I would look at the front rotors and wheel bearings. 70% of braking is done with the frontend. If you are intune with your car, it is possible a rear problem but few people can feel this.
Big question, where to you feel or hear this noise? Is the steering wheel wobbling when stopping? Feel the pulsation in your butt? Brake pedal also pulsating? Lets get back to basic checks first. Rick L. Ps I have blown an axle bearing like you said. I had grinding and oil leaking from the stub shaft seal. Spin wheel over by hand and check for noise or drag. Also check the color and condition of the fluid. Silver color in fluid major problem. I have been racing for 14 years with stock ball bearing on the stub shaft and no failures after first one at 3 miles, my bad.