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    Author Topic: Grabbing rear brake !!  (Read 635 times)

    Offline mikerallye

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    • Posts: 321
    Grabbing rear brake !!
    « on: October 20, 2009 - 01:27:58 PM »
    I never had a problem with my ebody 8 3/4 rear brakes, but my 9 1/4 ram 2500 that pulls the trailer is starting to grabb on the rt rear. ANy good starting point to look at? thanks  :clueless:
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    Offline burdar

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    Re: Grabbing rear brake !!
    « Reply #1 on: October 20, 2009 - 01:40:45 PM »
    A leaking wheel cylinder will cause the brakes to grab.  Also, a lot of brake dust caught inside the drums will cause that problem too.  Humid weather doesn't help the situation either.  I'd just pull the drums and clean everything out.  Then you will be able to see if a wheel cylinder is leaking.   
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    Offline Moparal

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    Re: Grabbing rear brake !!
    « Reply #2 on: October 20, 2009 - 07:10:07 PM »
    Look for a gear oil leak too. It will grab it quick.  The newer trucks have rear disc tho. What year is your?
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    Offline 426HEMI

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    • My M46 Barracuda! Member Since:October 01, 2005
    Re: Grabbing rear brake !!
    « Reply #3 on: October 20, 2009 - 08:07:06 PM »
    Yea it could be a rear axle leak that causes that. 
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    Got a pretty good start on my M46 optioned Barracuda restoration but now it is on hold till I can gather more funds.  Still need a few parts for it.  SIU Graduate 75 AAS Automotive Tech, 94 BS Advanced Tech Studies, 1997 MSED Workforce Education and Development

    1970 M46 Barracuda
    1998 Dodge Darango

    Gordon

    Offline dodj

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    Re: Grabbing rear brake !!
    « Reply #4 on: October 20, 2009 - 11:32:06 PM »
    I know it happens, but I've never understood why oil can make brakes grab. :dunno: You would think it would make them slip!
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    Scott
    1973 Challenger  440 4 spd 
    2007.5 3500 6.7 Cummins Diesel, Anarchy tuned.
    Good friends don't let friends do stupid things. ........alone.

    Offline duodec

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    Re: Grabbing rear brake !!
    « Reply #5 on: November 01, 2009 - 11:22:48 PM »
    Quote
    I know it happens, but I've never understood why oil can make brakes grab. :dunno: You would think it would make them slip!

    The lube reduces the coefficient of friction between the pad/shoe material and the disk/drum.  Instead of the relatively smooth increase in effective friction, and therefore energy conversion from movement to heat as pedal pressure increases, you get almost none (it slips) until the pressure increases to the point where even the slickened surfaces' limits are reached and they 'grab'.  Ease the pressure just a bit and they release again with very little friction between them.
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