Re: small bolt pattern disc to large bolt pattern disc
[Re: kjonas]
#1110432
11/09/11 08:29 PM
11/09/11 08:29 PM
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Joined: Jan 2003
Posts: 75,125
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JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,125
A Banana Republic near you.
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You need to change the spindles, the calipers, rotors, the pads , the flexible rubber lines, upper control arms and both the upper and lower ball joints. I think someone , dr. diff maybe ??, sells a tapered spacer that allows the smaller ball joint in your original A arms to fit the later spindle, that will save you having to replace the upper A arm and balljoint.
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Re: small bolt pattern disc to large bolt pattern disc
[Re: JohnRR]
#1110433
11/09/11 09:33 PM
11/09/11 09:33 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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FYI you wont gain a great amt of front braking going to the single piston discs (73-76) though the single piston type is more trouble free so I'm assuming you're going BBP for wheel selection as the reason. Ask for '76 A body calipers as they have a significantly larger bore dia 5/32", 2.75 as opposed to 2.60 in 73-75 calipers and they all interchange and more front bias is almost always beneficial. rebuilt calipers are dirt cheap and rarely have a prob & when it is it's the piston doesn't retract enough & there's a bit too much drag on the wheel
live every 24 hour block of time like it's your last day on earth
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Re: small bolt pattern disc to large bolt pattern disc
[Re: RapidRobert]
#1110434
11/09/11 10:23 PM
11/09/11 10:23 PM
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Joined: Oct 2008
Posts: 1,894
Mira Loma, CA
69B3GT
top fuel
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top fuel
Joined: Oct 2008
Posts: 1,894
Mira Loma, CA
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Quote:
FYI you wont gain a great amt of front braking going to the single piston discs (73-76) though the single piston type is more trouble free so I'm assuming you're going BBP for wheel selection as the reason. Ask for '76 A body calipers as they have a significantly larger bore dia 5/32", 2.75 as opposed to 2.60 in 73-75 calipers and they all interchange and more front bias is almost always beneficial. rebuilt calipers are dirt cheap and rarely have a prob & when it is it's the piston doesn't retract enough & there's a bit too much drag on the wheel
Ive been told the BBP disc make the tires sit out a bit farther then the SBP, any truth to this? 
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Re: small bolt pattern disc to large bolt pattern disc
[Re: RapidRobert]
#1110436
11/10/11 10:35 AM
11/10/11 10:35 AM
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Joined: Jan 2003
Posts: 75,125
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,125
A Banana Republic near you.
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Quote:
Quote:
Ive been told the BBP disc make the tires sit out a bit farther then the SBP, any truth to this?
I believe yes
Most definitely yes the Tires stick out 1/2 to 3/4 more perside .
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Re: small bolt pattern disc to large bolt pattern disc
[Re: Pntastar69]
#1110438
11/10/11 03:03 PM
11/10/11 03:03 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Can get a piece of thin flat clear stiff plastic and with a compass make a 4" and a 4&1/2" dia circle and cut out the center so it will fit over the hub register (doesn't have to be exact just need it to fit flat). Make a mark anywhere on the 4" circle and 4 more holes on around the 4" circle circumference spaced 2.351" in a straight line tangent from each other then punch them out to 7/16". Move up to the 4.5" circle and and same deal start anywhere and make a pinprick mark but offset a bit like in the above pic then 4 more marks (dont punch them yet) spaced 2.645" in a straight line tangent from each other around the circumference. Now you have (5) 7/16" holes in a 4" BP and 5 pinpricks in a 4.5" BP. With 5 holes punched set the template on the 7/16" studs and with a hammer and a pointed punch make 5 dimples thru the template into the rotor & remove the template and drill 5 more holes in your rotor in your drill press to the right dia for 1/2" press fit studs or the slightly smaller dia for 1/2" screw in studs (recommended) plus tapping for threads of course. Want the 1st set of 5 holes to be the exact dia of the 7/16" existing studs so the template will locate the new 1/2" stud holes perfectly concentric
live every 24 hour block of time like it's your last day on earth
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Re: small bolt pattern disc to large bolt pattern disc
[Re: RapidRobert]
#1110439
11/10/11 03:06 PM
11/10/11 03:06 PM
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Joined: Jan 2003
Posts: 75,125
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,125
A Banana Republic near you.
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Quote:
Can get a piece of thin flat clear stiff plastic and with a compass make a 4" and a 4&1/2" dia circle and cut out the center so it will fit over the hub register (doesn't have to be exact just need it to fit flat). Make a mark anywhere on the 4" circle and 4 more holes on around the 4" circle circumference spaced 2.351" in a straight line tangent from each other then punch them out to 7/16". Move up to the 4.5" circle and and same deal start anywhere and make a pinprick mark but offset a bit like in the above pic then 4 more marks (dont punch them yet) spaced 2.645" in a straight line tangent from each other around the circumference. Now you have (5) 7/16" holes in a 4" BP and 5 pinpricks in a 4.5" BP. With 5 holes punched set the template on the 7/16" studs and with a hammer and a pointed punch make 5 dimples thru the template into the rotor & remove the template and drill 5 more holes in your rotor in your drill press to the right dia for 1/2" press fit studs or the slightly smaller dia for 1/2" screw in studs (recommended) plus tapping for threads of course. Want the 1st set of 5 holes to be the exact dia of the 7/16" existing studs so the template will locate the new 1/2" stud holes perfectly concentric
And then pistol drill it by hand I assume ???
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Re: small bolt pattern disc to large bolt pattern disc
[Re: Pntastar69]
#1110440
11/10/11 08:14 PM
11/10/11 08:14 PM
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Joined: Jan 2003
Posts: 7,798
Lyons, CO
MileHighDart
master
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master
Joined: Jan 2003
Posts: 7,798
Lyons, CO
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Quote:
Have the hubs/rotors redrilled to bbp. Had mine done at Moser Eng.
Last I heard Moser wasn't doing this service anymore. Something about the machine they used for it is no longer available ?
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Re: small bolt pattern disc to large bolt pattern disc
[Re: JohnRR]
#1110441
11/10/11 09:15 PM
11/10/11 09:15 PM
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Joined: Oct 2008
Posts: 1,894
Mira Loma, CA
69B3GT
top fuel
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top fuel
Joined: Oct 2008
Posts: 1,894
Mira Loma, CA
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Quote:
Quote:
Quote:
Ive been told the BBP disc make the tires sit out a bit farther then the SBP, any truth to this?
I believe yes
Most definitely yes the Tires stick out 1/2 to 3/4 more perside .
Thank you. I guess ill be doing ANOTHER disc brake swap on this car 
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