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Brake parts identification. 900 1993

posted by  mila on  Tue Aug 9 14:35 CST 2011
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last visit: Fri Sep 5 06:26 CST 2014
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The FAQ is somewhat unclear on the front brake parts. I had some new parts from the dealer and got a little confused before sorting things out.
Subject is a 93 945 with Girling front calipers, without ABS.
The FAQ says 287mm rotors for my car which is wrong, should be 280mm.

Thickness is correct, 26mm. Volvo part number for this rotor is 31262209







The brake pad description for this setup is also not correct in the FAQ.
The REPCO 1198 style is good for this caliper, not 508 as stated in the FAQ.
Note that there are at least two different Volvo part numbers for the pads;
31261183 old style wih a big lump of friction material, stamped with number 31261176 on the backside.

Here are some picture of the old style pads.







31302996 is current style, chamfered sides and a groove in the middle. Stamped with number 31317312 on the backside.

Here are some pictures of the new style pads.






HTH
mila







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    Brake parts identification. 900 1993

    posted by  spook on  Tue Aug 9 19:06 CST 2011
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    last visit: Fri Oct 24 08:06 CST 2014
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    Dear mila,

    Hope you're well. The new pads - with a center groove and angled edges - seems to have far less surface area, than the earlier design. Will the newer pads provide as much "stopping power"?

    Yours faithfully,

    Spook








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      Brake parts identification. 900 1993

      posted by  mila on  Tue Aug 9 22:10 CST 2011
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      last visit: Fri Sep 5 06:26 CST 2014
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      Spook,

      I'm thinking the same. The active area is about two thirds of the old design and this must make a difference. I'll use the old ones for now so I can't tell how they perform.
      But since this is Volvo original I guess they have a good reason to make this design change.

      mila








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        Brake parts identification. 900 1993

        uid 6573's pic
        posted by  javalion on  Wed Aug 10 19:04 CST 2011
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        last visit: Wed Jul 23 09:57 CST 2014
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        Physics or some other class I had: "Contact area is not a function of friction." I won't discuss exceptions. The new pads are bi-u-tiful, will stop as well with probably less fade.

        I bought some aftermarket pads that have flat front and chamfered rear. That was a surprise. At least the rear organic should pair up properly with the semi metallic front. Trade you my flat for your chamfered?

        Tom









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          Brake parts identification. 900 1993

          posted by  mila on  Thu Aug 11 01:43 CST 2011
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          last visit: Fri Sep 5 06:26 CST 2014
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          Indeed is not area into the friction coefficient which I erroneusly believed at first.
          The surface pressure will be higher and the brakes will probably get hotter with a smaller pad area. Since most brakes get a higher friction coefficient with higher temperature you might even get better braking capacity, but with a lesser marginal to fading. Lifetime should be lower also.
          I think chamfering is used to avoid sqealing brakes.

          My gut feeling when looking at them is, go for the bigger ones...

          Trade is accepted, come by Stockholm for pickup! :-)

          Cheers,
          mila








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    Brake parts identification. 900 1993

    posted by  oldyellr on  Tue Aug 9 14:42 CST 2011
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    last visit: Fri Oct 24 14:28 CST 2014
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    I had a similar problem with my '92 745, no ABS. I ordered pads from FCP using that information and they were wrong. The ones I got were for 2 small pistons, not one big one like I have. I should have ordered ABS pads like you show, even though I don't have ABS. Live and learn.
    --
    1992 745 approaching 500k km







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