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Squeal from rear of car

  • 30-03-2019 3:24pm
    #1
    smeal
    Registered Users, Registered Users 2 Posts: 623 ✭✭✭


    Hi there, hoping someone can shed some light!

    Noisy squeal coming from rear passenger side wheel area. Similar noise came on last summer and so I had new brake pads and discs put on. Problem went away until recently when squealing noise came on again while driving on motorway but disappeared after about 10 minutes. The squeal also disappears when I press the brakes.

    Today the squeal came on again when driving on motorway and the noise was extremely high pitched and far worse than usual. It was that bad I could see concern on other drivers faces when passing me by! I pulled into a garage off the motorway and the mechanic put it on the ramp. He spent about 10 minutes checking the wheels, brakes and bearings and said they are all fine and couldn’t see anything wrong with it. Set off home and after a few minutes the noise came back on and again stops every time I apply the brakes.

    Can anyone think of any other problems it may be? 2010 Vauxhall Astra. Thanks!


Comments

  • #2
    Hal1
    Registered Users, Registered Users 2 Posts: 8,720 ✭✭✭Hal1


    Firstly, find a new mechanic.

    Then have the mechanic check each caliper. As the pistons might be seized. So that means the piston hasn't returned back into the bore of the caliper.

    Have them check the wheel bearings.

    Basically everything you asked the first guy to check.


  • #3
    corks finest
    Registered Users, Registered Users 2 Posts: 8,748 ✭✭✭corks finest


    Let the wife outta the boot bud


  • #4
    blackbox
    Registered Users, Registered Users 2 Posts: 4,707 ✭✭✭blackbox


    Does it stop if you press the brake or pull the handbrake lever?


  • #5
    smeal
    Registered Users, Registered Users 2 Posts: 623 ✭✭✭smeal


    blackbox wrote: »
    Does it stop if you press the brake or pull the handbrake lever?

    Yes if i press the brake


  • #6
    blackbox
    Registered Users, Registered Users 2 Posts: 4,707 ✭✭✭blackbox


    It's probably the brake pad just barely touching the disc, causing it to "ring" at its natural frequency.

    As long as the brake is not getting hot (compared to the other side) it is probably no harm - just annoying.

    If it's sufficiently annoying to be worth the effort of removing the caliper you could check it for free movement and work the piston in and out a couple of times. Depending on the car you might need a wind-back tool.

    Since pulling the handbrake doesn't stop it there probably isn't an issue with stiff cables.


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