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do my rotors need to be replaced? 200 1978

posted by  someone claiming to be dieter on  Wed Apr 13 12:53 CST 2005 [RELATED]

on a '78 245 with 220k:

doing the front brakes, i found some areas of the rotors to have rust spots, and one rotor appears to be slightly warped, with a wobble of less than 1mm. the other one is perfectly true.

when braking, there is felt a slight pulsing in which the braking power is briefly increased. is this an acceptable condition?

is there a recommended way of cleaning the rotors, or do they need to be replaced?

thank you in advance







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    do my rotors need to be replaced? 200 1978

    posted by  yama on  Wed Apr 13 13:01 CST 2005
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    last visit: Fri Oct 25 05:26 CST 2013
    [RELATED]

    IMHO any noticable warping is reason to replace. There is a specificaton on the min. thickness for rotors. Turning is not recommended and not really cost effective. FCP has a decent selection of new rotors for around 30 each.








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      do my rotors need to be replaced? 200 1978

      posted by  someone claiming to be dieter on  Thu Apr 14 08:49 CST 2005 [RELATED]



      ok. i read almost all volvos have girling calipers, but i am not so sure mine have not been replaced in the past. how can i identify them? the rotors are solid, not drilled or vented in any way. aren't girling calipers for vented rotors? what do you think i should order?


      thanks







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        do my rotors need to be replaced? 200 1978

        posted by  c_j_mooney on  Thu Apr 14 09:00 CST 2005
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        last visit: Wed Sep 14 17:39 CST 2011
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        The vented rotors have cavities between the braking surfaces - not drilled from side to side & slotted like the ones you see on Ebay. It's clear to see which is which when you look at the outside circumference of the rotor. It's a near-certainly you've got vented rotors. The solid rotors are just that - a solid disc, no vent spaces between the faces. Not used beyond the early 80s & converting your car to take them would also have involved switching calipers so it's highly unlikely anyone would have done that particular swap.

        EDIT: Please disregard my above ramblings. I read the year as 87 at first glance, not 78. My apologies! The opposite is true, you almost certainly need the solid rotors. Yes, replace them - solid rotors do not turn well on a lathe & are quite prone to warpage again after turning.
        -Chris








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        do my rotors need to be replaced? 200 1978

        posted by  someone claiming to be dieter on  Thu Apr 14 08:53 CST 2005 [RELATED]

        the faq answered the girling question, they are in fact girling calipers. then is it ok to get solid rotors?







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          do my rotors need to be replaced? 200 1978

          posted by  Bruce S. on  Sun Apr 17 22:56 CST 2005
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          last visit: Sat Oct 4 19:05 CST 2014
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          The brand of the caliper does not matter, you need to pull off a front wheel and look at the rotor. Is there an air gap between the front surface and the back surface, it will measure about a 1/4 inch wide? If there is an air gap you have vented rotors. Any brand of caliper you have could use a vented or non vented rotor.
          --
          Bruce S. near D.C.







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