'97 406 2 litre Rear Suspension Knock

Discussion in 'Peugeot 406' started by Bob C, Nov 1, 2005.

  1. Bob C

    Bob C Guest

    97 406 2 l rear suspension knocks when running over cateyes or 25 mm sudden
    step in pavement. Garage has had no success, but it now has the tightest
    set of subframe bolts in the world. Still knocks despite a number of
    searches which found nothing untoward. Of course it is difficult to apply
    the sort of forces road can apply to the suspension joints.

    Any clues?
    Bob C, Nov 1, 2005

  2. I am not familiar with the set up on a 406 but knocks can be caused by the
    strangest things. As an example, I had an Austin 1800 which had a very
    nasty knock from the rear suspension over the normal bumps you get in the
    road. It was eventually tracked down to the levers that projected through
    the brake backplates onto the handbrake cable. Their mounting pins had
    worn. The cure was to glue a piece of leather from an old belt onto either
    side of each lever where it went through the slot. The repair lasted until
    the car was scrapped five years later. The moral is that even silly little
    things can sound like something more serious so check everything like
    exhaust mountings, mud flaps and anything else underneath.
    Keith Willcocks, Nov 1, 2005
  3. Bob C

    nigel Guest

    It can be usually 1 of 2 things. The most common is the rear track
    control arm. This is the arm that is adjusted for the rear toe-in, one
    either side. If you get hold of the wheel at 10 o'clock and 4 o'clock
    (on the N/S) or 2 o'clock and 8 o'clock (on the O/S) and push/pull
    there should be no play. If there is then they need renewing.
    The other thing to check is the anti-roll bar drop link. Not easy to
    check, but the wheels need to be on the ground and the drop link
    bushes (top and bottom of the link) checked for wear. Really best done
    on a ramp.
    I'm not saying that there isn't something else, like exhaust, or
    whatever, but those two are the most common in my experience.
    Good luck!
    nigel, Nov 1, 2005
  4. I had a similar thing and my regular non franchised garage gave up. (They
    hate Peugeots!)
    I took it to a main dealer and they diagnosed it straight away - replaced
    both rear anti roll bar links and one front link. It's now fine and no
    knocking whatsoever. If I remember it seemed worse going round uneven corners.
    Hope this helps.
    steve R via CarKB.com, Nov 8, 2005
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