Home Forums Mechanical Brake Service on 1989 – 780 Turbo IRS

Viewing 3 posts - 1 through 3 (of 3 total)

Brake Service on 1989 – 780 Turbo IRS

  • Author
  • errcl65errcl65
    Post count: 18

    Does anyone have the Green book with the service procedure and diagram for the rear disc

    on the 1989 – 780 (turbo)?   I want to pull the rear assemblies completely down.   Info

    like torque on the wheel bearing nut,  torque on all the arm and bushing members.   Clear

    picture of the parking brake (big thick Omega retainer).

    At 224K km,  I want to put in bearings in as well.

    Post count: 183

    This site has the Greenback showing the rear IRS set up and service. Let me know if this is what you are looking for:  https://www.scribd.com/doc/10136300/tp31201-1-multi-link-rear-suspension#download

    If you do make the repair, please send some photos of what you do, as I know there are other 780 owners that need to make the same repair. Thanks!

    Post count: 18

    LUCAS / Metzger Quick Brake 0594  (160 0x25) $12.00
    Bosch has the same kit.  

    This kit has 4 shoe retainers, 2 long springs, 2 short springs. Kit replaces
    the Omega retaining ring/contracting spring on the 780’s (at least the 89).
    When fitting for the first time, the wheel hub has to come off.  You need to pull the
    bolt holding the dust shield out, mount the retaining shoes (2 per side), with the
    hook facing out.  The shoe center edge fits into the retaining shoe hook.  This
    keeps the shoe from pop out and supercedes the Omega ring which also acted as
    an upper return spring.  In place,  the kit uses a long string on top (end where
    the parking brake spreader is).    Replace the bottom fixed spreader bar, and hook
    the short spring to pull both bottoms together.    There is a YouTube video showing
    then entire rear 940.   https://www.youtube.com/watch?v=AuR1kfqwH2o.   They are
    doing it on 940 which already has the newer shoe retainer (they are also reusing what
    was there) , so they don’t have to pop the hub to install new retainers.

Viewing 3 posts - 1 through 3 (of 3 total)
  • You must be logged in to reply to this topic.