(1) In any proceeding for contribution, the contributor shall not be entitled to resist the claim on the ground that the claimant who has paid the injured person was not liable to such person; but, subject to this section and to the general law of estoppel, he may resist the claim on the ground that he himself is not liable to such person and, for this purpose, may dispute any question of law or fact even though that question arises also on the liability of the claimant to the injured person; and the contributor may in the same way dispute the amount of the damage suffered by the injured person.
(2) Where a claim for contribution is made by third-party notice in the injured person's action and the third party is given leave to defend the main action, he shall be bound by the finding of the court upon the questions that he is given leave to defend.
(3) Where the contributor had knowledge of an action brought by the injured person against the claimant, and unreasonably failed to make a p
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