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  •  » serious brake lock up

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    12/29/2013 11:13 PM  #1

    rmousir
    FYI Addict

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    Registered: 4/01/2013
    Posts: 156

    serious brake lock up

    Hey all,

    A little back ground.

    1966 mustang coupe, c auto, 5.0
    Front disc, rear drum, MS power booster

    So I put power booster in last spring and have been driving the car with no problems.  Well the cold weather hit so I let the car sit for a few weeks.  Well yesterday was nice and I decide to take the car out and let her strech her legs so to speak.

    The first time I had to hit the brakes with any solid pressure the passenger side rear locks up and the back end jumps with the one wheel dragging.  This scared the crap out of me cause when it locked up it 'thumped' and it felt like the back end jumped.

    This happened 3 times.  I nursed the car home and put her away.  If I'm gentel with the brakes they are normal, but if i apply pressure quickly the a$$ end jumps and locks.  I've never had this happen.

    My thought is to look at the brakes and fix but I have a set of the MS brackets that will let me bolt on discs in the rear.  Maybe I should just move on to those?

    Thoughts?

     

    12/30/2013 6:07 AM  #2

    John Ha
    I FYI 24-7

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    From: Mitchell, SD
    Registered: 4/02/2013
    Posts: 755

    Re: serious brake lock up

    It sounds like you need to adjust your proportioning valve to reduce the rear brake action a bit.

    Founding Member of the Perpetually Bewildered Society
     

    12/30/2013 10:27 AM  #3

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 11,744

    Re: serious brake lock up

    A leaking grease seal with grease getting on the shoes will cause the brakes to lock up like that. A stuck wheel cylinder can cause wierd problems as well.  I would think it is not proportioning valve related due to only one side having the issue.  If you find grease on the shoes, you will need to replace the grease seal, which is no big deal, but sure would temp me to go ahead and install the rear discs.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    12/30/2013 11:07 AM  #4

    hmartin025
    I FYI 24-7

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    Registered: 4/01/2013
    Posts: 365

    Re: serious brake lock up

    Second what MS sez. Also a leaking wheel cylinder can foul up the brakes as well. So check both rear wheels for something amiss.
    Howard

     

    12/30/2013 3:14 PM  #5

    rmousir
    FYI Addict

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    Registered: 4/01/2013
    Posts: 156

    Re: serious brake lock up

    Thanks for the replies guys.  I'm gonna get her up and check out the back.  I'll also dig out my MS disc bracket package and take a look at the part list.  Might be time to just upgrade.  I'll see.
     

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