Rear disc brake conversion kits for 74 Challenger?

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    Author Topic: Rear disc brake conversion kits for 74 Challenger?  (Read 8422 times)

    Offline brads70

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    Re: Rear disc brake conversion kits for 74 Challenger?
    « Reply #15 on: September 04, 2010 - 07:40:57 PM »
    Quote from: Chryco Psycho on September 04, 2010 - 07:28:15 PM
    not sure how the Hotchkiss bar fits but if it is above the diff & links down onto the rear leaf springs it will probably hit the bar
    It mounts below the rear end and links up to the frame.
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    Brad
    1970 Challenger 451stroker/4L60 auto OD
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    Offline miketyler

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    Re: Rear disc brake conversion kits for 74 Challenger?
    « Reply #16 on: September 04, 2010 - 08:14:19 PM »
    Diff's kit works great. I have some pics around here somewhere
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    Offline FBJJChallenger

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    Re: Rear disc brake conversion kits for 74 Challenger?
    « Reply #17 on: September 04, 2010 - 11:42:10 PM »
    Yea,

    I'm questioning if I need them after more asking around. I talked to the person who's doing my resto and he said that having the discs on the front you really don't need them on the back. He also said that the front do 60-65% of the braking and the back take up the rest. So unless you are planning on a bunch of hard stops it's not really necessary.
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    Offline thedodgeboys

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    Re: Rear disc brake conversion kits for 74 Challenger?
    « Reply #18 on: September 05, 2010 - 04:21:24 AM »
    Quote from: Katfish on September 04, 2010 - 03:27:46 PM
    I really question the need for rear discs, other than the cosmetic appeal.  I have the 11.75 discs in front with 11x2.5 drums in the rear.  I even put the smaller 7/8" wheel cylinders to help limit the rear's.  They still lock up before the fronts.  So the the standard solution is to put in an adjustable valve.  But what does this do?  It effectively limits the pressure to the ahead, I don't get it. 


    Sounds like something is worg with your brake bias did you change your brake  balance vaulve when you added the new front disks?
    The front should always lock first.


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    Offline miketyler

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    Re: Rear disc brake conversion kits for 74 Challenger?
    « Reply #19 on: September 05, 2010 - 08:31:25 AM »
    Drums can look really funky behind custom wheels. For me it was more of a "look" thing
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    Offline Chryco Psycho

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    Re: Rear disc brake conversion kits for 74 Challenger?
    « Reply #20 on: September 05, 2010 - 11:46:23 AM »
    rear drums generally will lock up first without a variable proportioning valve   , there is less load on them
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    Offline Katfish

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    Re: Rear disc brake conversion kits for 74 Challenger?
    « Reply #21 on: September 05, 2010 - 12:25:10 PM »
    Quote from: miketyler on September 05, 2010 - 08:31:25 AM
    Drums can look really funky behind custom wheels. For me it was more of a "look" thing

    Do you have a side shot with the rim on?  What size disc do you have on the rear?
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    Offline Katfish

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    Re: Rear disc brake conversion kits for 74 Challenger?
    « Reply #22 on: September 05, 2010 - 12:28:40 PM »
    Quote from: thedodgeboys on September 05, 2010 - 04:21:24 AM
    Sounds like something is worg with your brake bias did you change your brake  balance vaulve when you added the new front disks?
    The front should always lock first.

    My point exactly!  Why would you put discs on the rear (other than for cosmetics) and then turn down the line pressure so much to limit the "improved" braking?  The system needs to be balanced, and the truth is the fronts do almost 75% of the braking.

    Don't get me wrong, if I had unlimited funds I'd throw a set of the 13 or 14" discs on front and then get some discs for the rear too.

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    Offline miketyler

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    Re: Rear disc brake conversion kits for 74 Challenger?
    « Reply #23 on: September 05, 2010 - 03:16:21 PM »
    a rusty drum (or even a painted one) just doesnt look right  :smokin:

     
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    Offline Katfish

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    Re: Rear disc brake conversion kits for 74 Challenger?
    « Reply #24 on: September 05, 2010 - 05:09:23 PM »
    10.87" Discs do look nice, but the large finned drums actuallly fill out the rims more.

    Outside Diameter 13.62" / 5 Bolts / Finned

    I'd like to get 13" or larger if I was going to put them on my 18" rims.  But that would really be defeating the purpose.
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    Offline miketyler

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    Re: Rear disc brake conversion kits for 74 Challenger?
    « Reply #25 on: September 05, 2010 - 06:14:34 PM »
    I doubt you are going to find too many that actually prefer the look of drums but to each his own. Maybe on an all drum car?  I think discs look better, match the front, easier to change shoes, etc.

    But no doubt about it, converting to them is anything but cheap.
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    Offline ajantics

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    Re: Rear disc brake conversion kits for 74 Challenger?
    « Reply #26 on: September 05, 2010 - 06:50:25 PM »
    Hi , are you running the ssbc rear brake kit and if so what sway bar are you using?  :2thumbs:
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    Offline miketyler

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    Re: Rear disc brake conversion kits for 74 Challenger?
    « Reply #27 on: September 05, 2010 - 07:51:36 PM »
    Am running Dr Diff's kit, wheels are 17x11. Also has OEM rear sway bar, did have to relocate the holes in the attach brackets slightly.
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    Offline ajantics

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    Re: Rear disc brake conversion kits for 74 Challenger?
    « Reply #28 on: September 05, 2010 - 07:57:13 PM »
    Thank you for the info! :2thumbs: I have a dr diff kit on the way with a 1" offset spring hanger kit so i was trying to figure out want to do. :pullinghair:
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