Join Date: May 2004
Location: Southern California
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I think PPC is right on the money.
Although proper torque (bolt preload) is important, the torque sequence might be more important on a rotor. It's important for the rotor to sit flat against the hub. I always tighten a little at a time in a "cross Pattern" as suggested by PPC. First, I'll snug the fasteners down until they all contact, finger tight. Then I'll use a tool and turn each 1/4 turn in the cross pattern. When all is done, I usually go once around to make sure all is tight. Also, this prevents rotor warpage.
Installation torque helps keep prevent the fastener from vibrating loose and maintains friction between the rotor and hub. Depending on the design, the proper torque ensure the interface is clamped and held by friction, not shear in the bolts. But too much torque can strip the threads in the hub.
So, yes installation torque is important, but given proper torque sequence vs installation torque, I'd take torque sequence.
BTW, you can always estimate torque - remember, 1 ft-lb means: a 1 lb force acting at 1 foot lever arm, or a 1/2 lb force acting at 2 feet lever, or 2 lb force acting at 1/2 foot lever....