Hydrolyzes 4-hydroxybenzoate-CoA, and to a lesser extent benzoyl-CoA and 4-chlorobenzoate-CoA. Not active against aliphatic acyl-CoA thioesters, including palmitoyl-CoA, hexanoyl-CoA and acetyl-CoA. 4-hydroxybenzoyl-CoA + H2O = 4-hydroxybenzoate + CoA + H(+) Unaffected by EDTA, Mg(2+), Mn(2+), Fe(2+), Ca(2+), Co(2+) and Zn(2+). Xenobiotic degradation; 4-chlorobenzoate degradation; 4-hydroxybenzoate from 4-chlorobenzoate: step 3/3. Homotetramer. Belongs to the 4-hydroxybenzoyl-CoA thioesterase family.