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I believe the "proportioning" was done by using different brake pad grade as OEM on the front left, though we all change them to be all 3 (6) the same, but in reality to be correct braking per design, the pads on the front left should be harder grade, that's why I think you see a lot of left front disks maybe look more grooved than the right ones.That's my conclusion at least
If the original had a round rubber cap approx. 30 mm in diameter on one end, it was a proportioning valve. Otherwise it was just a splitter/manifold. The parts diagram shows a splitter/manifold.
Just to add to the conversation - the SP1000 (possibly G5 though not sure) had a Brembo F09 rear caliper which had a 48mm Piston rather than the normal F08's (38mm) - so even though they had a standard 4 way cplitter with no proportioning valve the rear brake had a larger piston which changed the actual pressure application balance
Hi Moto, no offense taken. I am married, and "you're wrong" is an endearing word combination to my ears now In regards to the pads, not familiar with the T3 manual, but the G5 part manual shows the Front Left as Ferit I/D 330, and Ferit I/D 332 for the Front Right and Rear.Though, at this moment I don't recall if I ever did figure out if 330 is harder than 332, but that would make sense to me. The Moto Guzzi part numbers are 14654650 for the 330, and 14654601 for the 332 (same as T3 for these two)...
Right. The G5 diagram shows the same, simple manifold with four threaded ports as my T3's, not quite functionally equivalent to the part you installed. Here it is, part number 17 66 80 50:The difference is that your part lacks the fourth port for the brake light switch. (Edited to correct my initial oversight of the missing port )