Mysterious Braking Boing?!?

Discussion in 'General Motoring' started by snowfreckle, May 16, 2007.

  1. snowfreckle

    snowfreckle Guest

    hi volvo guys...i have a 1990 740 with a mysterious noise while
    braking. it sort of sounds like a boing, others think it sounds like
    a low note on an out of tune piano. it usually only happens when i am
    braking from a slow speed (parking, stop signs, etc.) i can feel a
    little difference in the brake, a little vibration, a little more
    give. there's also i squeaking from the front left wheel while i
    drive. my mechanic has replaced the brake pads, master cylinder,
    bushings, and hub over a period of 3 months. after the last visit it
    stopped for a month and then today came back. anyone have any idea
    what it could be? is it the calipers? is there a piano in my braking
    system? will i be crashing through stop lights? i'm also out of town
    and away from my mechanic. find someone to work on it now or wait a
    couple weeks until i'm back in town?

    i'd appreciate any help!
     
    snowfreckle, May 16, 2007
    #1
  2. snowfreckle

    Mal from Oz Guest

    Had similar problem a few years back, not on a Volvo but on a '93 Magna -
    turned out to be the brake pedal return spring making the odd 'boing' when
    the brake pedal was depressed. If braking hard say from 30+mph it didnt
    happen - only when tootering along.

    Went on for months driving me up the wall - went away on its own after a
    while.

    Cheers
    Mal
    Oz
     
    Mal from Oz, May 17, 2007
    #2
  3. snowfreckle

    tom callaway Guest

    I don't know if this applies to your 740, but many years ago, my 164 was
    making very similar noises just before the driver's side lower ball
    joint separated and dropped the suspension onto the pavement. It was
    making a creaking noise when steering and the boing when stopping. The
    creak was the dry ball joint and the boing was the spring shifting
    slightly due to the looseness in the suspension. I know that your car
    has a completely different suspension, but if it were me I would check
    ALL the suspension components NOW. It was no fun jacking it up and
    replacing the ball joint on the side of the road, and I'm just glad mine
    let go pulling away from a stop and not on the interstate
     
    tom callaway, May 18, 2007
    #3
  4. snowfreckle

    snowfreckle Guest

    thanks for the posts so far!

    ....speaking of messed up suspension...last fall my front drivers side
    strut completely tore loose. it almost stabbed a hole through the
    hood before i got it to the mechanic. it's been eight months since
    then and the boing noise just began a month ago. but i wonder if that
    could have messed some things up that are just now voicing
    themselves. i'm just confused why it stopped for a month after i got
    the hub and bushings replaced and now is suddenly back.
     
    snowfreckle, May 18, 2007
    #4
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