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We construct the homotopy pullback of $A_n$-spaces and show some universalproperty of it. As the first application, we review the Zabrodsky's resultwhich states that for each prime $p$, there is a finite CW complex which admitsan $A_{p-1}$-form but no $A_p$-form. As the second application, we investigate$A_n$-types of gauge groups. In particular, we give a new result on $A_n$-typesof the gauge groups of principal $\mathrm{SU}(2)$-bundles over $S^4$, which isa complete classification when they are localized away from 2.

Homotopy pullback of $A_n$-spaces and its applications to $A_n$-types of gauge groups