$A_a$	surface area of the nominal contact region [${\mathrm{m}}^2$]
$c$	specific heat capacity [$\mathrm{J}{\mathrm{kg}}^{-1}{\mathrm{K}}^{-1}$]
$f$	coefficient of friction
$f_f$	fluctuation of the coefficient of friction
$f_s$	stability of the coefficient of friction
$h$	convective heat transfer coefficient [$\mathrm{W}{\mathrm{m}}^{-2}{\mathrm{K}}^{-1}$]
$I$	temperature-dependent coefficient of wear intensity [$\mu {\mathrm{gN}}^{-1}{\mathrm{m}}^{-1}$]
$I_w$	thermomechanical mass wear [$\mathrm{mg}$]
$K$	thermal conductivity [$\mathrm{W}{\mathrm{m}}^{-1}{\mathrm{K}}^{-1}$]
$m$	vehicle mass [$\mathrm{kg}$]
$p$	contact pressure [$\mathrm{MPa}$]
$p_0$	nominal contact pressure [$\mathrm{MPa}$]
$q$	heat flux density [$\mathrm{W}{\mathrm{m}}^{-2}$]
$r$	radial coordinate
$r,R$	inner and outer radius, respectively [$\mathrm{m}$]
$r_{eq}$	equivalent radius of the contact region [$\mathrm{m}$]
$R_w$	dynamic rolling radius of the wheel [$\mathrm{m}$]
$t$	time [$\mathrm{s}$]
$t_i$	rise time [$\mathrm{s}$]
$t_s$	braking time [$\mathrm{s}$]
$T$	temperature [$°\mathrm{C}$]
$T_0$	initial temperature [$°\mathrm{C}$]
$T_a$	ambient temperature [$°\mathrm{C}$]
$T_m$	mean temperature on the nominal contact region [$°\mathrm{C}$]
$V$	vehicle velocity [$\mathrm{m}{\mathrm{s}}^{-1}$]
$V_0$	initial vehicle velocity [$\mathrm{m}{\mathrm{s}}^{-1}$]
$W$	work done during braking [$\mathrm{J}$]
$z$	axial coordinate
Greek symbols
${\alpha }_{eff}$	braking efficiency [${\mathrm{s}}^{-2}$]
${\beta }_{eff}$	relative braking efficiency [${\mathrm{s}}^{-2}{\mathrm{m}}^{-1}$]
$\delta$	thickness of the analyzed region [$\mathrm{m}$]
$\theta$	circumferential coordinate
${\theta }_0$	cover angle of the pad [$\mathrm{deg}$]
$\rho$	density [$\mathrm{kg}{\mathrm{m}}^{-3}$]
$\omega$	angular velocity of the disc [$\mathrm{rad}{\mathrm{s}}^{-1}$]
${\omega }_0$	initial angular velocity of the disc [$\mathrm{rad}{\mathrm{s}}^{-1}$]
Subscripts
$d$	denotes disc
$p$	denotes pad