Rear Disc Brakes for a Sunbeam Alpine! Tiger?

[Barry]

The Datsun F10 tandem MC is a unicorn. In any case, the proper sizing of the MC (whether single output or tandem) is mostly a function of the front brake calipers (not the rear) and whether or not a brake booster is used.

 

[Bill Blue]

I know I'm not Dan, but I also know this setup will work fine with a 3/4", 13/16" and 7/8" master cylinder. Braking effort will vary, not due to the rear calipers but to the size of the master cylinder. All else is the same. Now Dan says it works great with 11/16", I believe him.

Bill

 

[Barry]

Series Alpines with a brake booster had 0.875" (7/8") master cylinders. Series Alpines without a brake booster had 0.700" (Series I / II) or 0.750" (Series 3 / IV / V) master cylinders.

11/16" = 0.6875" which is close enough for government work and should result in a little less (~8%) pedal effort than a 3/4" MC.

 

[DanR]

I have two other Master Cylinders (1 ea 3/4 and 1 ea 13/16), I could change out to test what pedal difference would be? Main trouble is bleeding them.....

 

[Bill Blue]

Dan, the size of the master cylinder does not affect the relationship between the front and rear brakes. Just the pedal pressure needed to apply the brakes. Your rig will not suddenly go bananas because a different size master cylinder is installed.

Bill

 

[Hillman]

I honesrly don't know. I bought the car with the V6 done, and all the "identify your rear end" doesn't seem to help. The car is in storage now, but I'm planning to bring it home soon, if the snow finally melts so I can get it. I was told by the guy I bought it from it was a 3.55 and I know that it's Ford from getting new brake cylinders that fit but...

I went to vist it today. No tag on the diff but I think it's an 8 inch. No removable rear cover, front looks like this:


and axle mounting point look like this:

 

[Gordon Holsinger]

Thanks Warren, for the good comments and your support

Dan will your system work with wire wheels?

 

[DanR]

Hillman, The Hub Flange looks like the Mustang II. Very odd bolt pattern in my opinion. May be I'll take a picture tomorrow.

 

[DanR]

Gordon, I have them installed on one of my SIV's rear axles with wire wheels.

 

[Bill Blue]

That does not look like the 8" punken setting in my garage. The overall configuration of the ribs is different. The eight inchers are in a horizontal theme.

Bill

 

[MikeH]

Are the pictures showing the center section flipped?

 

[Hillman]

Are the pictures showing the center section flipped?

I hadn't noticed but I think they are a mirror image. The pic was taken from under the driver's door so the battery box should be on the left. I somehow got the phone in 'selphie' mode and couldn't get it out so I took it that way.

 

[husky drvr]

That does not look like the 8" punken setting in my garage. The overall configuration of the ribs is different. The eight inchers are in a horizontal theme.

Bill

 

[MikeH]

It looks very similar to the 67 and up case, if reversed.

 

[husky drvr]

It looks very similar to the 67 and up case, if reversed.

Right, and the '62-'66 probably matches Bill's description of his "pumpkin".

 

[Barry]

I went to vist it today. No tag on the diff but I think it's an 8 inch. No removable rear cover, front looks like this:
View attachment 19351

and axle mounting point look like this:

View attachment 19352 View attachment 19351

The pictured rear axle has a "drop-out" style differential carrier and the axle flange appears to have a trapezoidal (rather than rectangular) axle flange bolt pattern. I am reasonably sure that the only Ford rear axle with that combination of characteristics is the 8.8". For confirmation, the axle flange bolt spacing on the Ford 8.8" rear axle is 3.410" (top) and 3.076" (bottom).

 

[260Alpine]

Barry, I think you meant 8". The 8.8 has a rear cover.

 

[Barry]

Jim,

You are clearly right about the Ford 8.8" not having a drop-out diff carrier, don't know what I was thinking.

The second picture in post # 106 certainly appears to show an axle bearing housing with a trapezoidal bolt pattern. As far as I can find, the only recent Ford rear axle with a trapezoidal axle bearing housing flange pattern was the 8.8". One possibility is that the picture is deceiving and the bolt pattern is actually rectangular. Another possibility is that the PO put 8.8" axle bearing housing ends on an 8" axle housing when the axle housing was narrowed. That seems goofy, but maybe the PO simply used the parts he had on hand.

The apparent combination of a Ford 8" axle housing and center section with Ford 8.8" axle bearing housing ends would explain Hillman's comment that all of the "identify your rear end" information did not seem to help.

To quote Alice, "Curiouser and curiouser!"

 

[DanR]

Here is a PIC's of my '78 Mutt II rear axle assy.

It has a bolt pattern on the hubs very similar to the one Hillman posted. The bolt holes are 3 3/8" across the top and bottom horizontal and 1 3/4" ? vertical each side.


Here's Hillman's PIC of the hub with four holes to secure the axle.
axle mounting point look like this:

 

[Bill Blue]

Dan's late 8" chunk is patterned like mine. Only Ford knows for sure.

Bill