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14 bolt disk headache

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by misfit, Jan 15, 2001.

  1. misfit

    misfit 1/2 ton status

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    got a new rotor(for a 76 3/4 chev) and attached rear hub to it, then put on the 14 bolt spindle, sort of a mockup. then tried to put 76-78 eldo calipers on, no go. tried compressing piston and still couldnt get it over the rotor. ideas?
     
  2. Casey 86K5

    Casey 86K5 1/2 ton status

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    what kind of pads are you using and what are they for?

    Casey 86K5
    -'86 Chevy K-5
    -'85 Oldsmobile Cutlass
    -'79 Camaro Z-28
    -'79 Chevy C-10
    <A target="_blank" HREF=http://86blazer.coloradok5.com>http://86blazer.coloradok5.com</A>
     
  3. ken

    ken 1/2 ton status

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    Eldo rotors don't compress easily, you may have to ratchet the parking brake mechanism to get it to compress fully.

    ken
     
  4. HarryH3

    HarryH3 1 ton status Author

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    You can't just "compress" the piston on those calipers. There's a jackscrew mechanism inside the piston itself that takes out slack as the pads wear, so the parking brake will operate properly. There's a special tool that fits into the 4 slots in the face of the piston so that you can screw the piston back down to its home position. Most parts houses carry the tool you need.

    Also, are you sure that you have the correct caliper? If I remember correctly, it MUST be from a 1974 to 1976 Eldorado. You know, the HUGE landbarge with a monster V8 and front wheel drive. The rear rotors were 1 1/4-inch thick. Later Cadillacs used a similar caliper, but with a 1-inch thick rotor. The later style caliper won't open wide enough to fit over the truck rotors.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  5. Shawn

    Shawn 1/2 ton status Premium Member Author

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    Need more info here. Is this a 14 FF? Is it a newer TSM kit? If it's an older TSM kit it needs Ford rotors. Newer kits use the chevy rotor. The correct calipers are 76-78 according to TSM for both kits. Is it a used or new caliper? Have the ebrake arms been rotated? They are correct about needing a special tool to retract the piston in the caliper. I accidently rotated mine and had to get another caliper since I couldn't find a tool anywhere.

    Shawn
    87 K5
    few mods[​IMG]
    <A target="_blank" HREF=http://www.off-road.com/chevy>http://www.off-road.com/chevy</A>
     
  6. thebigdaddyof2

    thebigdaddyof2 1/2 ton status

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    When I did my 14 bolt disc brake swap, I bought the "GM version" brackets from TSM. I used '76 Eldorado calipers- rebuilt units. When installing the E-brake levers, I managed to ratchet out the pistons. The calipers I had DID NOT have the slots for the tool that is intended to reset the piston. I carefully used a large set of channel locks to rotate them back in.
    Then came the fun part. The calipers would not line up with the rotors. I had to use 4 washers to properly space the TSM brackets away from the 14 bolt's flange. Then of course, thread lock on the mounting bolts. I don't know if it was a design flaw by TSM or there is a slight difference in the 14 bolt that I used and the 14 bolt that TSM used to mock up the brackets. I never called TSM to ask or complain because frankly it's difficult to get a person to talk to you there. Even with the minor flaw, I recommend the brackets to anyone doing the swap. With 35" swampers, the truck stops as good or better than factory.
     
  7. DPI

    DPI 1/2 ton status

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    I installed the newer TSM kit that uses the Chevy rotors on my 14 bolt FF. It went together easily and correctly. I had absolutely no problem whatsoever. I bought the brackets and rotors from TSM and bought some rebuilt calipers from Oriely's for about $60 each with no cores. I would highly recommend this kit and I am happy with the purchase.


    [​IMG]
     
  8. misfit

    misfit 1/2 ton status

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    its a 14 ff, not a tsm kit im makin my own. forgot which year(76-78)the calipers are off, but theyre quite corroded and crusty. besides trying to screw the piston down, how else would i go about fixing it? what about the e brake arm?
     
  9. Shawn

    Shawn 1/2 ton status Premium Member Author

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    Ok, sounds like you just have calipers that are too far in for the rotors. If you're calipers look like mine (see on http://www.off-road.com/chevy/reviews/tsm/) then they're probably 76-78. You need to un-ratchet the calipers but I haven't seen the special tool either and I have no idea where to insert it. I tried to take mine apart but that led to a torn seal and I had to get another one from the parts store. Unless you can find that special tool that Harry is talking about, you may just have to purchase new calipers. At least you got the cores.

    Shawn
    87 K5
    few mods[​IMG]
    <A target="_blank" HREF=http://www.off-road.com/chevy>http://www.off-road.com/chevy</A>
     

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