Boss T/A front brake upgrade (Lincoln/Tbird calipers) thread

Discussion in 'Classic Mustang Specific Tech' started by Rusty67, Dec 12, 2007.


  1. bnickel

    bnickel Founding Member

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    any pics of the mockup so far? i'd like to see them if you do.
     
    #161
  2. Rusty67

    Rusty67 Well-Known Member

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    I'll take pics later today after my trip to the hardware store.

    Also, I checked the part numbers for the inner seal and the part number for the LTD and the drum hub are exactly the same. So that should tie up the last of the loose end in that department.
     
    #162
  3. Rusty67

    Rusty67 Well-Known Member

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    So I've run into a minor problem. The brackets I was loaned wont fit over the rear of the hub on the rotor. I am going to try and flame cut some flanges next weekend with a large enough center hole and no mounting ears on them. From there I can space out the mounting ears I will need.

    Pics:
    brake brackets pictures by 300zeex - Photobucket

    Also, I see why both Cobra Automotive as well as the other vendor say to face the caliper ears and drill out the threads. I Think I might be able to make the brackets work just fine without doing this. I will provably need a tap to clear out the thread all the way though the caliper body but no other modification of the calipers should be neccissary. I tried running the bolt all the way through without any success, it got stuck at the end.
     
    #163
  4. bnickel

    bnickel Founding Member

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    which rotor did you end up getting? is it the 71 LTD rotor like we were talking about? or did you use one from an earlier big t-bird? there are a couple of options here, you could either enlarge the holes on the bracets or machine to rotors as necessary. since these particular brackets aren't yours that makes modifying these brackets an issue, but if they were your brackets it wouldn't be a problem. i certainly wouldn't be concerned about doing it on some i owned, though a better fitting bracket/rotor combination would be preferable.
     
    #164
  5. Rusty67

    Rusty67 Well-Known Member

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    The rotor is the 70-72 LTD rotor. You could definately have the inner part of the rotor machined down to make it fit these brackets but there is still no garauntee the calipers would line up with the rotors using this bracket/rotor combo. There is just enough space to enlarge the hole in the bracket if so desired. Thats why I'm just going to make my own.

    Part of the reason I wanted to see some already made brackets is that I wanted to understand why they want you to face the caliper and drill the threads out. I understand that now but I personally don't believe it is neccissary. I think the bracket can be made to bolt up the calipers without modification.
     
    #165
  6. bnickel

    bnickel Founding Member

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    i know that the one guy you talked about the brackets at one point said their kits used the 70-72 LTD rotors so i was under the impression that everything would be the same, apparently i shouldn't ass-u-me, but in any case if we get a set of brackets that has the smaller hole we can open the hole up a bit as needed, so really not that big of a deal.
     
    #166
  7. Rusty67

    Rusty67 Well-Known Member

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    The brackets I've got are the Cobra Automotive style so they use a Mustang hub and are machined for that which is why we are running into this problem. I'm not worried about it because it looks like there is enough space to enlarge the hole in a bracket and still have enough meat in the bracket for strength. Hopefully I can flame cut a blank this weekend at my friends shop.
     
    #167
  8. Helmantel

    Helmantel New Member

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    Interesting to see that ABS powerbrakes now makes aluminum big KH calipers. I have they complete T/A setup, but it's still collecting dust on the shelf. At 389 bucks, they're not a bargain, but not extremely expensive either.

    I wonder if they're a direct replacement for the Thunderbird calipers, because in that case, the mounted holes will be threaded and need to be drilled out. Not that big a deal though.
     
    #168
  9. Rusty67

    Rusty67 Well-Known Member

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    Not with the brackets I'm trying to make... if I can make them the way I think I can...
     
    #169
  10. redhorse65

    redhorse65 New Member

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    I've started and done this conversion on a 65 Coupe w. 65 V8 drum spindles/hubs, Wilwood Rotors, Cobra's brackets and hardware and machined T-bird calipers. Stopping power is very good, but the Wilwoods developed a shudder when warmed up. I was hoping for a 1 piece rotor like the LTD rotor for street use (the 6012 Raybestos rotor for 1969- T'birds doesn't work on the 65 Mustang V8 Drum spindle, too deep in the bearing well, and snout doesn't clear enough for the cotter pin even.). The 70-72 LTD Rotorpros rotor looks like it'll work, but what about bearings to put this rotor on the 65 V8 drum soindles. Can anyone help with that one? I'll be glad to give any spec or info on my otherwise successful conversion too. I did find that I can NOT make the 67 dust shields work w. this combo. Any help with the bearings would be greatly appreciated!
     
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  11. redhorse65

    redhorse65 New Member

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    Re: interference with the caliper bracket: I also had the back of the 6012 rotor machined down equal to the OD of the 65 V8 drum hub so it would clear int othe opening in the bracket. Only problem still was the depth of the snout being too long f. the end of the spindle to clear enough. Will do the same to the LTD rotor if the bearings can be fig'd out. God-willing, if it works and bearings are doable, I'll post pics.
     
    #171
  12. Rusty67

    Rusty67 Well-Known Member

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    You said the 67 dust shield didn't work ? Why not ?
     
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  13. redhorse65

    redhorse65 New Member

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    It just wouldn't clear the Cobra bracket without cutting it (shield) up. I elected not to since it doesn't see much wet/dirty use anyway. I thought the 69 spindles were different from the 65 V8 drum units? I see the LTD rotor needs A12 and A13 bearings, whereas my 65 drum hubs use A2 and A6. Does some combination of bearings and race work with the 65 drum spindles? That's what's got me mixed up. I'll try to get a photo tonight of the shield-bracket interference. Still have them in case I need regular GT brake setup. Any advice on bearings is still appreciated too! I'd love to get this to work once and for all.
     
    #173
  14. Rusty67

    Rusty67 Well-Known Member

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    Who is using a 69 spindle ?

    The 65-67 V8 spindles are the same, drum or disc. I think 68 and 69 drum spindles are the same as well. I believe in 70 they switched to the larger bearing. I can't remember if it was 69 or 70 when they switched the bearing.

    Just use drum inner and outer bearings for a 65 and the LTD rotor should mount up just fine on your 65 drum/disc spindle.
     
    #174
  15. redhorse65

    redhorse65 New Member

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    Is it just that simple- using the V8 drum hub bearings and the races that come w. the LTD rotors? I list A6 for inner and A2 for outer (A1 is for outer 6cyl), but still... that seems easy.
     
    #175
  16. redhorse65

    redhorse65 New Member

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    Holy cow- thanks for that info.
     
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  17. redhorse65

    redhorse65 New Member

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    The Rotorpros LTD Rotor interferes with the caliper at the rotor hub. I ended up using the 69 T-Bird Rotor, but had to have the outer race machined for 5/16" more depth to clear the cotter pin slot, and had to have the inner side of the hub machined to clear the ID of the caliper bracket. Still waiting to drive it, but will post pics if it is successful.
     
    #177
  18. hivewax

    hivewax Member

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    bringing this thread back from the dead... i went the easy route and bought the Cobra Auto big brake kit. i'd like to see where you got the aluminum calipers to fit these big brakes and if anyone has done the front swap to rear brake setup like the Boss T/As.

    here's a video of the swap at Walt + Chip Hane's shop...
    YouTube - Walt and Chip
     
    #178
  19. 96 DOHC Cobra

    96 DOHC Cobra Founding Member

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    Somebody owes me 16 seconds of my life back.
     
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