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More front brake pulsing fix[200/1979] posted by Don Willson on
Tuesday, 9 March 1999, at 2:11 p.m.
For 9 months I have been fighting pulsing brakes with 2 rotor turnings and freeing up the caliper pins. I was about ready to go buy new rotors but first I thought I would see how "wobbly" they were. I put a dial indicator on and found they were 0.006 inch and 0.008 inch runout. I cleaned the hub and inside of the rotor. Then I put the rotor on and tightened it down in each of the 5 positions, and on the opposite wheel.
I found a position where the runout was least, about 0.003 to 0.004 inch, and reassembled the wheels. On a run around the block if felt good, I'll go make a highway run and see if it helped.
The Volvo spec is 0.003 inch maximum runout.
And just an gut feel I do not see how uneven torquing of the lug bolts could warp the rotor, at least the removable rotor, that has the straw hat shape.
'86 744 ZF xmission 120K miles, '89 760TI AW xmission 140K miles.