Friction Coefficient for Brake Pads: Validity of F=2x(UN) Equation?

AI Thread Summary
The discussion revolves around determining the friction coefficient of brake pads using the equation F=2x(UN) versus F=UxN. The user is conducting tests where a brake disc is pulled between two pads, measuring the force required for slippage. They question the validity of using F=2x(UN) under the assumption that both pads exert identical forces and coefficients of friction. The conversation highlights that both equations are referenced in various contexts, suggesting that the choice depends on the specific testing scenario. Ultimately, clarity on the application of these equations is essential for accurate friction coefficient determination.
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I've been trying to figure out the friction coefficient of some brake pads. My test fixture only allows me to pull (F2) a brake disc between two brake pads clamped around the disc with a force F1. I then measure with a load cell the maximum force required for the brake disc to slip.

My question is simply, will the basic equation F=UxN be valid, or is it correct to assume that F= 2x(UN) in this scenario assuming F1 and U is identical for both brake pads?

I've been googling the topic and my impression is that both equations are used.
 

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Should be F=2 x (UN). Imagine replacing one of the pads with a frictionless pad and then you'd get F = 1 x (UN) for the one pad with friction.
 

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