No Tüv and that with a five-year-old car!

Hello, my Bella recently had to go to Tüv. With the result: No Tüv. Significant defects on the rear axle (all lateral handlebars wrack) and an unevenly acting braking system at the rear. Car is a 147 1.6Ts year 01. Cost point only the transverse handlebars new approx. 600€. We leave the brakes outside. Has one already had similar experiences? Are 600€ too much for the transverse handlebars? Track adjustment is included. MfG