line lock on 73 duster ?

Discussion in 'Mopar Racers Forum' started by silver fox, Feb 7, 2016.

  1. silver fox

    silver fox Well-Known Member

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    we've been working on a 73 duster my son got for about three year's now. it sat for year's before he got it. over these past year's we came to the conclusion it was built for street & track reverse valve trans drive shaft cage 488 gear now 323 ect. ect. there was a switch on the shifter which we took off that I see was a line lock which is what Dart 4 forte has for sale my ? is what should I look for to reinstall if I was back in 1973 it would be great to reinstall any help would be great on hooking it up again wiring ect.thank's
     
  2. 70aarcuda

    70aarcuda Master Hoader of SBM FABO Gold Member

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    wiring in line lock?

    one wire on the solenoid goes to ground the other goes to the button, the other wire on the button goes to a 12 volt source...

    you can put a in line fuze if you want...
     
    • Agree Agree x 2
    • diymirage

      diymirage HP@idle > hondaHP@redline

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      if I remember correctly there are two ways to wire in a line lock
      you can use it to lock out the rear, this means the rear brakes will NOT engage when you get on the brake pedal
      this is nice because you can do a burn out and roll out of it by leaning of off the brakes
      in this case, you turn the line lock on BEFORE you get on the brake

      the other way, you install the line lock on the front brake
      in this case you get on the brake, THEN set the line lock (locking up the front) and when you get off the brakes the fronts are still locked so you can roast the hides
      down side of this is, there is no easing off the brakes when you let off the line lock
       
    • My 72 340

      My 72 340 Well-Known Member

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      Sure that isn't a trans brake switch?
       
    • hangn0ut

      hangn0ut Well-Known Member

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      The couple of times I engaged my line lock (solinoid in the front brake line) before applying the brakes,that pedal became so solid I doubt I could have had any braking at all.
       
    • AJ/FormS

      AJ/FormS 367 FormS clone 3.09-1.92-1.40-1.09-.78od 3.55s

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      I hate to say yer doin it wrong, but....
      First you step on the brake, hard.
      Then you engage the button (which is usually "M-O", or momentary-on) to energize the solenoid, and keep the button engaged. This locks the brakefluid in the line and thus the front brakes stay locked on.
      Then you take your foot off the brake, still keeping the button "on". This releases the rear brakes.
      This keeps the car from rolling at the start-line,with a stick-shift car.
      Or allows massive burn-outs without burning up the rear shoes.heehee
      This is PART II of diymirage's post above(#3)


      If you apply the line-loc button first,then you are preventing brake-fluid from going out to the front system.So if you then step on the pedal, the fluid cannot move, and the pedal feels rock hard. That would be normal.And since the piston in the M/C cannot move, you would not have any brakes at all. Also normal.

      If you have an M/T, the line-loc is an excellent hill-holder, making redlights at the tops of hills, no longer delicate,dangerous, balancing acts.I wired my LL to a second,dash-mounted, on-off switch.This allows me to set the front brakes for any period necessary, so I don't have to sit there with my finger on the switch, hoping it won't slip off or the finger go numb, or to suffer my pedal-jamming-leg to start shaking.
       
    • famous bob

      famous bob mopar misfit

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      looks to me that is what he said. o.p., if the solinoid is still there, just wire a hot wire running thru the momentary switch , and ground the other at the solenoid. like he said, transbrake switch maybe ?
       
    • silver fox

      silver fox Well-Known Member

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      lot's of info thank's my ? is if I installed the solenoid back in 73 where would I have put it & what would it look like sorry gang I wasn't thinking at the time about a line lock system on the car when we got the car just wanted to get going got stuff out of the way I did not know about,I have the switch & the light that was on the shifter, would like to reinstall, new to this can't wait for spring it's in storage now
       
    • TrailBeast

      TrailBeast Slightly Twisted Member

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      Mine allows fluid to the brakes when applied but not back until released.
      I can hold the button down and touch the brakes and the car acts completely normal and starts slowing, then touch the pedal again and it brakes more, but it only lets go of the brakes when the lock is released.

      Point is that it is not a solid stop of the fluid both ways, though I'm not sure what any benefits of that function would be.
       
    • hangn0ut

      hangn0ut Well-Known Member

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      I was refering to post#3,hookup in the rear brake line...
      Took a car out this weekend. No linelock. Just roll thru the water and give her a little throttle. In high gear.
       

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    • D-50394

      D-50394 Well-Known Member

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      We can't do a burnout across the starting line.
       
    • hangn0ut

      hangn0ut Well-Known Member

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      Irwindale lets the faster cars smoke em cross the line. You would definately qualify.
       
    • Cope

      Cope Well-Known Member

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      No to sidetrack or hijack but Hangnout, how much room do you have between the tire and "fender"? How much do those tires "grow" at the top end?

      Im working on a set of tubs and dont want the tire to contact the tub at speed.
       
    • hangn0ut

      hangn0ut Well-Known Member

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      Those are 34s. They probably grow to 38-39s.
       
    • hangn0ut

      hangn0ut Well-Known Member

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      Tubs generally clear pretty good. The lower rocker panel ahead of the tire seems to me to be where first contact occurs.
       
    • Jack Mosby

      Jack Mosby New Member

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      @Kent mosby