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Disc swap calliper question?

Discussion in 'The Garage' started by highrlr, Apr 5, 2006.

  1. highrlr

    highrlr 1/2 ton status

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    I need a little help, and possibly a part number if anyone has one. They have two part numbers at napa for the chevy 3/4 ton front calipers, I need to know which one to use for my 14bff disc swap. Also, do I use the same caliper mounting bolts that would be used on the front of a 3/4 ton? My truck is 700miles away since I am away at school right now and im trying to get the parts compiled so I can run home for a weekend and finish it up and then make a mad dash back to Wyoming to do some wheeling. Should be interesting! Any help would be greatly appreciated!
     
  2. Masiony

    Masiony 1/2 ton status

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    just make sure the caliper is for a 73-87 3/4 ton or 1/2 ton. the two part numbers are probably for a 10 bolt and D44.
     
  3. MattK

    MattK 1/2 ton status

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    yep. just make sure you run either both 1/2 tons or both 3/4 tons...they both will bolt up, but the 3/4 ton calipers have larger pistons.
     
  4. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    There is no difference between 1/2 and 3/4 ton calipers, and i have no idea why Napa has 2 part numbers. I work in a machine shop that has a parts store up front and i've had the guys check and they only show one part number for a caliper or our rigs. Do yourself a favor though and buy a caliper that fits your year rig that way you have the same line going into it IE: either 10mm metric or 7/16" american banjo bolts.
     
  5. Masiony

    Masiony 1/2 ton status

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    44's have 7/16 banjo's while 10 bolts have 10mm. this is probably the reason for the two part numbers.
     
  6. Muddytazz

    Muddytazz 1 ton status

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    I'm running 10 brake lines on a D44 caliper. Slight mod to make them work.
     
  7. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Actually, that makes sense. :doah:

    I think however that even some D44's had the 10mm banjo bolt if i'm not mistaken. But two part numbers to cover that small difference does makes sense but not for a 1/2 ton versus a 3/4 ton because in that sense they are the same.
     
  8. Masiony

    Masiony 1/2 ton status

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    i also was under the assumtion that all 60's had 10mm banjo's till my buddies 78' had 7/16 ones.
     
  9. Muddytazz

    Muddytazz 1 ton status

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    GM switched over to the 10mm banjo bolt when they switched to the 10bolt axle.
     
  10. Leper

    Leper 1/2 ton status

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    I purchased both a month or so ago and the pistons were different sizes. About 1/4" outside to outside.


    I would go with the 1/2 ton stuff. OR. You can get the Caddy calipers for like 60.00 from Oriellys. The piston in them is even smaller(better IMO).
     
  11. cbbr

    cbbr 1 ton status GMOTM Winner

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    What year caddy caliper did you use? I need to get a set and I want an e-brake.
     
  12. hero

    hero Registered Member

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    Since no one has given you an exact answer yet, maybe this will help. When I did mine, here are the part numbers that I used from O'Reilly. There is a $15 core charge on the calipers if you don't have any old ones laying around to take in for exchange.

    A1 Front Left Rebuilt Caliper 1 A1 18-4046 $16.29
    A1 Front Right Rebuilt Caliper 1 A1 18-4045 $16.29
    Standard Brake Front Disc Rotor 2 SB 81-60427 $24.99 $49.98
    Caliper Bolts (Guide Bolt) 2 BB HDW5004 $5.49 $10.98
    Disc Pad Set 1 BB MKD52 $17.99
    $111.53
    Misc
    Inner Wheel seal 1 NAT 2081 $6.99
    Wheel Studs 4 DOR 610-189 $3.19 $12.76
    O'Reilly Total $131.28

    Speedway Motors QTY PN
    Proportioning Vave Wilwood 1 8352608419 $38.95
    3/16 x 20" steel brake line(1) 2 910 31800-20 $2.50 $5.00
    Brake Line Mount Tabs (pkg 4) 1 910 31310 $9.95
    3/8-24 IFF to AN -4 Male (Pair) 1 6174029 $9.95
    SS Braided Line 12" (AN 4) 2 910 31842-4 $9.95 $19.90
    90 deg 7/16-20 to AN-4 2 6172062 $7.95 $15.90
    Speedway Total $99.65

    Total $230.93


    My SS Braided brake line could have been a little bit shorter, but it worked.
     
  13. cbbr

    cbbr 1 ton status GMOTM Winner

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    Thanks for the run down. One more question, looks like you are running with no e-brake - front calipers - correct?
     
  14. Leper

    Leper 1/2 ton status

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    1977 caddy eldorado. You will have to fab up a lever for the e-brake and get some kind of spring. They are long ago discontinued from Chevy. You will also need some Chevette brake hoses and a couple hardlines.
     
  15. MattK

    MattK 1/2 ton status

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    yeah i found the same thing when i was looking for calipers, but after having a set of both at my house ive measured the pistons and they are different.

    unless i suppose they were for some reason they are from different years and chevy changed their piston diameters among both the 1/2 ton and 3/4 stuff.
     
  16. hero

    hero Registered Member

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    Yeah, I'm using a driveline brake for my parking brake. Not ideal, but it's worked for me.
     
  17. highrlr

    highrlr 1/2 ton status

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    Sweet, thanks for all the answers everyone! I will get the parts on order, but now I have to decide between the caddies or the 3/4 ton calipers. I would like to have an e-brake again eventually so I will probably go with the caddies. I can still run the caddies without the e-brake hooked up correct? Oh, and is an adjustable proportioning valve needed, or can I run without one? Thanks alot again for the help, this is hard since my truck is over 600 miles away from me right now, and I will have minimal time to finish it when I get back home, so I need to have all the correct parts there, waiting for me.
     

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