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Model Years: 1967-1968. 911S and 911L vehicles.
Material: High Grade Cast Iron.
Casting Method: Pressure Cast
Finish: Yellow Zinc Dichromate
Fasteners: M7x1x55 Cap Head Ribe R6. Grade 10.9. Oiled Black Oxide.
Spacers: Yes. 10mm
Pistons: 38mm. Pistons are hard chrome/nickel plated. Many are finally showing signs of age and should be replaced with stainless steel 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: This caliper first showed up on the 911R race cars. Once proven in the racing environment, they made their way on to the very first 911S in 1967. Ironically, the body is the exact same casting as the standard rear L-Calipers on all of the other 911 and 912 models from 65-68. If it was going to be a “Wide L-Caliper” the casting would then be machined to 38mm pistons vs. 35mm. You can tell a real Wide L-Caliper because the dust boot flange is much thinner to accommodate for the addition 3mm in piston diameter. Also, the fasteners had been upgraded from M6x1 to M7x1 and they now have the “Ribe” R6 head on the fastener. Perhaps the biggest change is the 10mm spacers they installed in between the caliper ½’s to allow for a 20mm vented rotor in the rear of these cars. Because of the limited number of 911S model produced and shipped to the US market, this caliper is über rare. Not only was there a limited number of 911S and L cars imported, these were the last waning years of the SWB (short wheelbase) cars so, only a couple of years and only the top end models.