Caliper White Papers > 65-68 911/912 Rear L-Calipers

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Characteristics:

Model Years: 1965-1968.  ***Note*** some of the first 901 (911) cars came equipped with 356 calipers.

Material: High Grade Cast Iron. 

Casting Method: Pressure Cast

Finish: Yellow Zinc Dichromate

Fasteners: M6x1x45 & 55 Cap Head Standard Hex. Later calipers incorporated M6x1x55 fasteners throughout. Grade 10.9.  Oiled Black Oxide.

Pistons: 35mm.  Pistons are hard chrome/nickel plated.  Many are finally showing signs of age and should be replaced with stainless steel versions if rusted. Link to stainless steel pistons.

Knockback Mechanism (to maintain a high pedal on non-booster circuit cars): Yes. Internal c-clip. Removable.

Compensating Lines: Yes. No internal fluid passages.  Also commonly called “bridge pipes”, “balance pipes” or “crossover tubes”.  These lines were originally tin coated steel with yellow dichromate Cohline 10x1x14mm ends.  They also had a rubber bump stop incorporated into the lines.

Bleeder Valves: M10x1 short.  2 bleeders per caliper. Should have pointed end to seat properly.

Fluid Inlet Style: Direct.  The “A” shaped fluid hard line screws directly into the caliper. 

Mounting: In front of the axle.  Notch in caliper pistons should be facing the bleeder by 20˚

Pads: FMSI D30 Pad Size.

Other Identifying Factors: As mentioned above, the very first cars had 356 calipers on them.  The calipers are dimensionally identical, in fact, after they ran out of the 356 calipers to use on the 911  models, they still had various bits and pieces left over from the 356 rear caliper run that they would use up by integrating it into the later model L-Caliper.  It is not uncommon to see a later L-Caliper back ½ mated to 356 front ½.  Early castings did not have casting numbers cast into them.  This was ATE’s first venture into pressure casting so they little or no information to go on as to how long these molds would last.  Mid and later rear L-Calipers began to have casting (mold) numbers in them.  There are three basic types of fluid inlets that can give you a general clue as to the calipers age.  Early calipers have the round fluid inlet.  Mid-run calipers have bossed ramps on either side of the fluid inlet to strengthen that area.  The final versions of the L-Caliper have what we call the “guitar pick” fluid inlet.  This inlet has bossing that is shaped like a triangle with rounded edges that look like a guitar pick.

Eric Shea

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