According to GM waivers for, say, copper in brake pads, if a pad submission to a Tier 1 caliper supplier is rejected by the Tier 1 caliper supplier for copper 75%, what are the options to solve the rejection?

Work with the Tier 1 to develop a shared process for submitting/accepting MDS submittals containing substances that will be phased out prior to a regulatory implementation  date.        (We found this question to be unclear, so would suggest the supplier discuss with the individual OEMs.  Contact information can be found on IMDS website.)