Well, if I understand you correctly, this spring serves to bring back the parking brake shoes back to their resting position (at least on my 92 300TE). Besides not being able to fulfill that function a broken spring may sratch inside the rotor and may eventually be torn and destroy the parking brake assembly. This is probably not a big saftey issue, but still I would replace the spring with new ones. I am not sure whether it is available individually. The whole parking brake assemby for my 300TE was around 28$. Good luck, Bruno

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1992 300TE 160 kmiles