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1968 Brake conversion

 
SpikeJ
New User
Posts: 6
Joined: 01/13
Posted: 01/07/13 11:22 AM

Working on restoring a 1968 Coupe and was attempting a brake conversion.  Found 1970 spindels and brackets cheap and a calipers and pads with new  hardware so I thought i was good but with new spindles, disc and brakets on I am having trouble sliding the calipers on.  The   clarence between the pad mounted on the caliper and the disc is to tight and i can't slde it on. Does anyone have any thoughts?  Or does anyone have dimensions on the calipers and/or mounting brackets?  I could machine the bracket or caliper to get more clarence but it would be good to know if the caliper is off or the braket is off.  I suppose even the spindle or the disc and bearings could be off but with out knowing any dimensions I don't know where to begin.  

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waynep71222
Enthusiast
Posts: 455
Joined: 04/12
Posted: 01/08/13 11:02 AM

there are about a dozen articles in the tech section on brake conversions...


can you take images of what parts you have... perhaps with forging and stamping numbers to help identify which parts you have....  so we can help you...

you can use photobucket  imageshack or any of a dozen more sites to post images..

different brackets/spindles use different calipers...

it the rotor too far out.. or too far inboard to slide the caliper and pads in????

you could even take a video and post it to you tube and then the link here..  

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SpikeJ
New User
Posts: 6
Joined: 01/13
Posted: 01/17/13 11:19 AM

I've posted the image the first sort of shows my problem.  This is the drivers side had to force it on but now the rotor won't turn. Caliper Pics

The next is the passenger side rotor when i just set it on it still needs to go down about 1/2" forcing it down creates to much friction on the rotor.
IMG 20130116 211555 370 Zpscfee2785

The next pics are from the back of the rotor showing the caliper and how it rides on the mounting bracket.  Their is a shoulder on the caliper I'm thinking this maybe it but it does keep the caliper away from the bracket so that the rubber bushings for the caliper bolts don't get pinched

Another pic  

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54packman
Enthusiast
Posts: 343
Joined: 11/09
Posted: 01/17/13 01:34 PM

Try torquing the wheel bearing nut to about 25ft lbs, and then back it off, looks almost like the rotor is not back far enough due to a wheel bearing race not seated.  

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MustangMan
Moderator
Posts: 261
Joined: 08/11
Posted: 01/18/13 08:30 AM

I'm thinking you have the wrong wheel bearings in use here. There are different bearings that will fit the rotor but be too tight or too loose on the spindle. I've installed brake kits from Master Power Brakes on the '67-'68 and the '69-'70 Mustangs and they come with both sets of bearings, as it is easier to ship both sets than try to determine what the owner has on the car and have a potentially upset customer. I don't have the bearing numbers in front of me, but a good parts store should be able to look it up for you.

I always test fit the bearings on the spindle before installing them in the rotor too. Saves the time of knocking them back out (and their races) when I install the wrong set (been there done that, got the T-shirt).

HTH...
Mark  
Mark Houlahan
Brand Manager
Mustang Monthly Magazine

1965 FFR Roadster 427W/TKO-600 5-speed
1966 Mustang 289-4V/C4 Auto
1968 Mustang 4.6L Three-Valve/5R55S Auto
1990 Mustang 306/AOD
2002 Explorer Sport Trac 4.0L V-6/5R55 Auto
2005 F-150 4x2 4.2L V-6/4R70W Auto

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waynep71222
Enthusiast
Posts: 455
Joined: 04/12
Posted: 01/18/13 09:47 AM

perhaps this will help identify the bearings..   the numbers at the right are the cone and cup numbers that are actually visible on the bearings themselves  first part is the inside.   second  is the outside race.


1978-1970 8" ring gear
Seal (inner) ............................................................. 6815
Set (inner) ............................................................SET13 or A-13  07100/07196
Set (outer) ............................................................SET12 or A-12  LM12749/LM12710

1969 Boss Mustang with disc brakes
Seal (inner) ...........................................................9150S
Set (inner) ..............................................................SET5 or A-5 LM48548/LM48510
Set (outer) ..............................................................SET3 or A-3 M12649/M12610

1969-1967 exc. Boss Mustang w/disc brakes
Seal (inner) ............................................................. 6815
Set (inner) ..............................................................SET6 or A-6   LM67048/LM67010
Set (outer) ..............................................................SET2 or A-2   LM11949/LM11910

FRONT WHEEL (cont.)
1966-1965 disc brakes
Seal (inner) ............................................................. 6815
Set (inner) ..............................................................SET6 or A-6   LM67048/LM67010
Set (outer) ..............................................................SET2 or A-2   LM11949/LM11910

1966-1964 6-cylinder engine and drum
brakes
Seal (inner) ...........................................................7994S
Set (inner) ..............................................................SET4 or A-4  L44649/L44610
Set (outer) ..............................................................SET1 or A-1  LM11749/LM11710

1966-1964 8-cylinder engine and drum
brakes
Seal (inner) ............................................................. 6815
Set (inner) ..............................................................SET6 or A-6    LM67048/LM67010
Set (outer) ..............................................................SET2  or  A-2  LM11949/LM11910

ID and OD sizes for each bearing set..

set1 LM11749/LM11710    .688 ID  1.570 OD

set2 LM11949/LM11910    .750 ID 1.781 OD

set3  M12649/M12610   .833 ID  1.969 OD

set4  L44649/L44610   1.063 ID  1.980 OD

set5  LM48548/LM48510   1.375 ID  2.563 OD

set6  LM67048/LM67010   1.250 ID  2.238 OD

set12  LM12749/LM12710   .866 ID 1.781 OD

set13  07100/07196               1" ID   1.969 OD


i know that there are ford engineering part numbers on most of the spindle assemblies... does anybody have a list of them by application???  

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waynep71222
Enthusiast
Posts: 455
Joined: 04/12
Posted: 01/18/13 10:39 AM

i will post this separate...



1978-1970 8" ring gear
Seal (inner) ..............6815
Set (inner) ...............SET13 or A-13  07100/07196  1" ID   1.969 OD
Set (outer) ...............SET12 or A-12  LM12749/LM12710 .866 ID 1.781 OD

1969 Boss Mustang with disc brakes
Seal (inner) ..............9150S
Set (inner) ................SET5 or A-5 LM48548/LM48510  1.375 ID  2.563 OD
Set (outer) ................SET3 or A-3 M12649/M12610 .750 ID 1.781 OD

1969-1967 exc. Boss Mustang w/disc brakes
Seal (inner) ................6815
Set (inner) .................SET6 or A-6   LM67048/LM67010  1.250 ID  2.238 OD
Set (outer) …..............SET2 or A-2   LM11949/LM11910  .750 ID 1.781 OD

FRONT WHEEL (cont.)
1966-1965 disc brakes
Seal (inner) ...............6815
Set (inner) ................SET6 or A-6   LM67048/LM67010  1.250 ID  2.238 OD
Set (outer) ................SET2 or A-2   LM11949/LM11910  .750 ID 1.781 OD

1966-1964 6-cylinder engine and drum
brakes
Seal (inner) ...............7994S
Set (inner) ................SET4 or A-4  L44649/L44610  1.063 ID  1.980 OD
Set (outer) ................SET1 or A-1  LM11749/LM11710  .688 ID  1.570 OD

1966-1964 8-cylinder engine and drum
brakes
Seal (inner) .............. 6815
Set (inner) .................SET6 or A-6    LM67048/LM67010  1.250 ID  2.238 OD
Set (outer) .................SET2  or  A-2  LM11949/LM11910  .750 ID 1.781 OD

ID and OD sizes for each bearing set..

set1 LM11749/LM11710    .688 ID  1.570 OD

set2 LM11949/LM11910    .750 ID 1.781 OD

set3  M12649/M12610   .833 ID  1.969 OD

set4  L44649/L44610   1.063 ID  1.980 OD

set5  LM48548/LM48510   1.375 ID  2.563 OD

set6  LM67048/LM67010   1.250 ID  2.238 OD

set12  LM12749/LM12710   .866 ID 1.781 OD

set13  07100/07196               1" ID   1.969 OD  

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SpikeJ
New User
Posts: 6
Joined: 01/13
Posted: 02/04/13 08:07 AM

Thanks all
I already corrected the bearing issue.  The spindles i purchased were 70 spindles (though they sold them as 68's) so I had to get the larger bearings to match.  That got me closer but still a little off.  Ultimately i took a grinder cleaned up a little flash metal from the poor caliper casting where the caliper met the caliper bracket and i was good to go.  Again thanks to all.  

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