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We evaluate the decay width for the processes $f_1(1285) \to \pi^0 a_0(980)$and $f_1(1285) \to \pi^0 f_0(980)$ taking into account that all threeresonances are dynamically generated from the meson-meson interaction, the$f_1(1285)$ from $K^* \bar K -c.c$ and the $a_0(980)$, $f_0(980)$ from $\pi\eta, K \bar K$ and $\pi \pi, K \bar K$ respectively. We use a triangularmechanism similar to that of the $\eta(1405) \to \pi \pi \eta$, which providesa decay width for $f_1(1285) \to \pi^0 a_0(980)$ with a branching fraction ofthe order of 30%, in agreement with experiment. At the same time we evaluatethe decay width for the isospin forbidden $f_1(1285) \to \pi^0 f_0(980)$, whichappears when we consider different masses for the charged and neutral kaons,and show that it is much more suppressed than in the $\eta(1405) \to \pi \pi\eta$ case, but gives rise to a narrow shape of the $\pi^+ \pi^-$ distributionsimilar to the one found in the $\eta(1405) \to \pi \pi \eta$ decay.

$f_1(1285)$ decays into $a_0(980)\pi^0$, $f_0(980)\pi^0$ and isospin breaking