在买方完全履行其合同义务前，WIRTGEN CHINA可以拒绝履行其保修承诺义务。
WIRTGEN CHINA may refuse to honour its warranty obligations as long as the Buyer has not fulfilled its contractual obligations.
先合同义务是指合同成立前及合同无效时缔约双方当事人所负的附随义务。
Precontractual liability is a kind of collateral liability imposed on the both parties before the contract is concluded or when the contract is void.
当合同履行期限截止前，一方当事人认为对方具有不履行合同义务的事实或可能时，可以根据法律以及当事人之间的约定请求对方承担违约责任。
If refuse to accept this expected promise breaking bears debt continuously, but can not get damages before performing expiration, and undertake the risk of this duration.
当合同履行期限截止前，一方当事人认为对方具有不履行合同义务的事实或可能时，可以根据法律以及当事人之间的约定请求对方承担违约责任。
If refuse to accept this expected promise breaking bears debt continuously, but can not get damages before performing expiration, and undertake the risk of this duration.
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