Editing AMR 33 (section)

===Modernisation===
In 1934, it had already become obvious that Renault had been right in advising the selection of a different suspension type. The standard one proved to be much too flimsy and very maintenance intensive, especially the oil shock dampers. Both the three vehicles built in 1935 and the two rebuilt prototypes were therefore fitted with an improved AMR 35 suspension type with rubber cylinders.<ref>{{harvnb|Vauvillier|2005|p=27}}</ref> Prototype 79758 had been used to test three different systems: the first with the trailer wheel touching the ground, the second with five road wheels and the last, which was the one selected.<ref>{{harvnb|Vauvillier|2005|p=22}}</ref> The second type would form the basis for the Renault ZB, a lengthened export version, destined for [[China]]. It was more lightly armoured at 9&nbsp;mm and had a 65&nbsp;hp engine. Twelve were ordered in 1938, six with a 13.2&nbsp;mm machine gun and six with a 37&nbsp;mm cannon.<ref>{{harvnb|Vauvillier|2013|p=74}}</ref>

After continuing reports regarding the unreliability of the matériel – often ascribed to the fact that half-trained conscripts were the most frequent users rather than professional drivers – it was decided to investigate whether structural changes had to be made. Accordingly, the type was again tested by the Commission de Vincennes between 8 September 1936 and 5 May 1937. The commission concluded on 17 February 1938 that the suspension was fundamentally unsuited for cross-country driving and advised that all existing vehicles be fitted with a new system.<ref>{{harvnb|Touzin|1979|pp=50–51}}</ref> When war broke out, it was decided to improve readiness by fully revising all AMR 33s. During that process, they were to be refitted with the new suspension.<ref>{{harvnb|Vauvillier|2005|p=27}}</ref> About half a dozen vehicles had been so modified on 10 May.