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Care & Install: Aluminum Calipers
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If the engineers of your vehicle decided to use aluminum for the body of the calipers on your vehicle, they were probably more focused on performance than they were on the cost to manufacture. Aluminum calipers enhance the performance of a vehicle by reducing what they call un-sprung weight, which helps acceleration and handling. Aluminum calipers also retain a cleaner look, as they are less prone to corrosion. I am sure you have seen rusty cast iron calipers on other vehicles. There are really not many downsides of having aluminum calipers on your vehicle aside from cost of manufacture and care that needs to be exercised while installing them. Other than those 2 items, the life expectancy and their function are pretty much the same as their cast iron counterparts.
One thing to keep in mind is that aluminum is much softer than cast iron or other metals that calipers are more commonly made with. The main precaution that you need to take when installing aluminum calipers is to make sure to only finger-tighten all fittings (Banjo bolt, bleeder screw, etc),
and then use a torque wrench to finish-tighten to the vehicle manufacturer’s specifications.
This is very critical because those fasteners are made from hardened steel and will very very easily strip out threads in an aluminum caliper if overtightened.