Crazy PO Front Caliper/Hub Setup
 

While looking at replacing my master cyl today I was disturbed to say the least at what the previous owner had on the front as a hub/rotor/caliper combination. Suffice to say, not one piece matches that of the other side.

I'm pleading with the board to take heart and help me ID the stuff I have so I can order the replacements I need. The car is a 1970 911T, for now I'd like it to be stock, I'll look at upgrading as time progresses.


DRIVERS SIDE:
CALIPER - 'M', 3" spacing, marked on outside 'ATE'
ROTOR - Solid, only ~1/2" inch thick ->Pre 69??
HUB - Extends ~1 5/16" from where the rotor bolts onto -> also pre '69??

PASSENGER SIDE:
CALIPER "M" but with a spacer between the halves??, 3" bolt spacing, marked 'ATE 45' Bleeder valve on bottom?? (Wrong caliper for side?)
ROTOR - Vented, ~11/16" thick
HUB - Deeper, Extends ~1 7/8" from where the rotor joins the hub.

Any help would be greatly appreciated as the car is off the road until I work this out.

Regards,
Andrew M
70 911T

Andrew,

Your '70 'T' should have vented rotors all around, per the factory spec book. And, the 'spacer' you noted was used to adapt the 'M' caliper to thicker vented rotors, both front and rear.

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Warren Hall
1973 911S Targa

1) All M calipers have 3" mounting ear (bolt) spacing (and take same size pad) so all can be interchanged (at that simple level)
2) They come in three different widths ( for the solid, vented, and thick vented rotor)the only difference is spacers to accomodate the different widths
3) And they have several different piston diameters (although 2 and 3 are in some cases linked - only the 3.2 Carrera Ms came with 42mm pistons(others had 38mm pistons), and they were the only ones of their widest width).
The rotors on all '70-'84 911 are the same vented, 282mm x 20mm F and 290mm x 20mm R

The big problem is the bleeder pointing down. You cannot bleed the brakes that way. I have an original set of m's for $50, from a '70T. Ed

The valve on the bottom comes from putting a left side caliper on the right or vice versa