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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.

Don --
'86 744 ZF xmission 120K miles, '89 760TI AW xmission 140K miles.




 


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