PPV Brakes on NNBS
#71
Teching In
While you have that 4 piston apart, you mind measuring the thickness behind the pistons? Someone was curious how much material is back there as they have that little bump out on the outside that hits some wheels. I have milled a couple sets down at their request but was curious how much can be removed. Consider its flat on the inside behind the pistons but the outside has that casting bump. I just figured it has something to do with the casting process.
"If you’ve ever wondered why the 2019+ 4 piston calipers have a ridge on the outside, here’s why. It’s for fluid passage, but the whole ridge does not allow for fluid passage. Fluid only passes at one small point in the center. The GM design is a small passage drilled at an angle, at the bottom of the cylinder bore. Also GM only drills one passage for fluid flow between the half’s.
I could not get an accurate measurement for the outer surface thickness. But if you grind that whole ridge off and develop a pinhole leak in the center, you now know why. As a guess, I’m thinking the outer ridge runs the whole length for more aesthetic purposes. It would look strange if it only had one lump in the center between the pistons.
I bought this set to basically take apart and see how they were made, and to get the piston diameter. Excuse my messy lines, but you get the point."
#75
While this thread is still going, thought I would add some feedback on new pads. The GM Brembo pads create A LOT of dust, like...powder everywhere. I replaced them with a set of generic ceramic pads, they were $60, Powerstop 172407 from Rockauto. Work great, hardly any dust on the wheels after a week of city driving.
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zz454Chevelle67 (02-21-2023)
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GMT K2xx Trucks General Discussion
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08-11-2024 06:51 AM