Brake Rotor Runout Measuring

240se · 01-27-2020, 02:58 PM

I replaced my front rotors over the weekend because I have had issues with brake vibration during previous track days. When I looked in the FSM for the torque specs I saw where they recommend testing the mounted rotor runout and adjusting the rotor position on the hub to find the position with the least runout. I didn't have tools to measure runout but now I feel like I should especially since I have the sport brakes with fixed calipers and 14" rotors.

Before I go down the rabbit hole on this, any suggestions on which dial gauge and mount to get? I have seen in other threads where people mention testing runout but no details.

Per the 2012 FSM maximum runout measured on vehicle for both sport and non-sport brakes is:
Front .0014in, .035mm
Rear .0022in, .055mm

I used the Centric 125.42100 rotors and didn't have any vibration on the test drive but I want to verify runout.

01-27-2020, 02:58 PM	#1 (permalink)
240se Enthusiast Member Join Date: Nov 2013 Location: VA Posts: 260 Drives: Gunmetal 12' Rep Power: 12	Brake Rotor Runout Measuring I replaced my front rotors over the weekend because I have had issues with brake vibration during previous track days. When I looked in the FSM for the torque specs I saw where they recommend testing the mounted rotor runout and adjusting the rotor position on the hub to find the position with the least runout. I didn't have tools to measure runout but now I feel like I should especially since I have the sport brakes with fixed calipers and 14" rotors. Before I go down the rabbit hole on this, any suggestions on which dial gauge and mount to get? I have seen in other threads where people mention testing runout but no details. Per the 2012 FSM maximum runout measured on vehicle for both sport and non-sport brakes is: Front .0014in, .035mm Rear .0022in, .055mm I used the Centric 125.42100 rotors and didn't have any vibration on the test drive but I want to verify runout. Last edited by 240se; 01-28-2020 at 03:37 PM.

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