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Cadillac STS Forum - 2005 through 2012 Discussion, Cant get rear rotors off!! 2005 sts awd in Past Cadillac Vehicle Discussion; Originally Posted by 1BadCadSTS For future reference WD-40 is NOT a penetrant its a lubricant. It is never a substitute ...
  1. #16
    C&C's Avatar
    C&C
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    Re: Cant get rear rotors off!! 2005 sts awd

    Quote Originally Posted by 1BadCadSTS View Post
    For future reference WD-40 is NOT a penetrant its a lubricant. It is never a substitute for PB Blaster.
    Well, it is (also a penetrant); may not be primarily a penetrant (though it is listed on the can), its original purpose was as a water displacement solution, but will act as other remedies as well. It is a thin (viscosity) petroleum distillate and will creep (by capillary action) into tiny spaces.

  2. #17
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    It's essentially useless as a penetrant, technicalities don't help get stuck parts off.

    WD-40 - Water Displacer, 40th formulation.

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    BaTu is offline Cadillac Owners Enthusiast
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    Re: Cant get rear rotors off!! 2005 sts awd

    WD40 is the "Listerine" of the toolbox. It doesn't do much of anything, certainly not Any Kind of Penetrate!

    It actually works best as a solvent. If you have a stuck band aid, or need to remove adhesive tape glue left on fur (my horse vet showed me this) it works pretty well. I think it's pretty good at cleaning lock cylinders too. Sprayed onto those springs & pins locksmiths recommend it. No oil, little penetration, it's the "cure" for not much of anything....

    There was a Very Interesting article in a Machinist Magazine a while back where they tested the penetration property of a bunch of stuff (I don't think they even considered WD) and the results were surprising. BP did OK, Kroil did better, but what "Blew Away" EVERYTHING, nothing came close, to,,,,, a Homemade mix of 50-50% ATF & Acetone!

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    Re: Cant get rear rotors off!! 2005 sts awd

    Quote Originally Posted by MoistCabbage View Post
    It's essentially useless as a penetrant, technicalities don't help get stuck parts off.

    WD-40 - Water Displacer, 40th formulation.
    WD-40 is fish oil in a can.

  5. #20
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    Re: Cant get rear rotors off!! 2005 sts awd

    I think the OP didn't say if it was the front or rear, but the E-brake mechanism could be the culprit.
    Another way is to emory/file the rust off the hub section.
    Also, when you do get the rears off, if you choose to resurface, use a large half-round file and take the ridge line off the inside diameter, waste a can of brake cleaner on all the parts, and lube with lithium all the moving parts. Wipe the pad faces and the inside drum with more cleaner before assembly. Don't miss spraying up inside the the cable.

    Back in the 70's I owned a couple of Dodges and an old Studabaker, I used up plenty of cans of ol' WD-40 on the coils and wires just to get it started in the morning dew. Its not a lube, its a water displacer.

    " There was a Very Interesting article in a Machinist Magazine a while back where they tested the penetration property of a bunch of stuff (I don't think they even considered WD) and the results were surprising. BP did OK, Kroil did better, but what "Blew Away" EVERYTHING, nothing came close, to,,,,, a Homemade mix of 50-50% ATF & Acetone! "

    Excellent post BaTu, I have always told others that if you have patience, hydraulic oil will find its way into anything. The Acetone will help thin it and quicken its search.

  6. #21
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: Cant get rear rotors off!! 2005 sts awd

    Lifer is technically correct. Whale Oil, Water Displacement Formula 40; WD-40.

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