This appeal involves two assignments of error. The trial court, after issue joined, made an adjudication *831of law points under the provisions of R. C. P. 105, in which it held plaintiff’s petition stated a cause of action. Eight days later, however, it changed its ruling, held no cause of action was stated, and dismissed the petition. The court stated it had not understood the allegations of the petition as plaintiff’s counsel later advised it they were intended, nor as involving the substantial question which plaintiff sought to raise in the case. In the light of its later interpretation, the court found no cause of action pleaded, and dismissed the petition. Plaintiff’s'counsel do not agree with the final interpretation put upon the petition by the court, but contend it was in error in its application of the law.
I. We are first confronted with a question of procedure. The plaintiff urges that having once made its ruling under rule 105, the court was without power to change it, and was in error in attempting to do so. The material part of rule 105, upon which the plaintiff reiies, is this: “* * * It [the court] shall enter an appropriate final order before trial of the remaining issues, adjudicating the point so determined, which shall not he questioned on the trial of any part of the case of which it does not dispose. * * (Italics supplied.) Plaintiff cites Weik v. Ace Rents Incorporated, 249 Iowa 510, 513, 87 N.W.2d 314, 317, and Litchford v. Iowa-Illinois Gas and Electric Co., 247 Iowa 947, 952, 75 N.W.2d 346, 348. The Weik case says only that the adjudication was a final order and that no motion for judgment on the pleadings was necessary. Litchford holds that when law points have been determined under rule 105 they should be followed on the trial and may not there be reversed or questioned. Neither is determinative of the point to be decided here. We have universally held that the trial court may, at the same term, change or modify an order or judgment. Goncannon v. Blackman, 232 Iowa 722, 728, 6 N.W.2d 116, 119, and eases cited. It is true this case and the authorities cited were all decided before the adoption of the Rules of Civil Procedure. But we think the principle is the same. Rule 105, so far as it says the order shall not be questioned on the trial, means that it is final on the question decided when further proceedings are had. It is a guide by *832which, the parties may determine their conduct if any issues remain. But we do not think it prohibits the court from changing its ruling before any such issues are reached; or when, as here, it determined the case and dismissed the petition. A court may always correct error into which it has fallen, before final judgment. Kuiken v. Garrett, 243 Iowa 785, 792, 793, 51 N.W.2d 149, 154, 41 A. L. R.2d 1397, and citations. The advantage of this rule is apparent here. If the court, although convinced its first ruling was in error, had not been permitted to correct it, it must be presumed the cause would have proceeded to trial and the court at that point would not have been permitted to change the ruling. Under the plaintiff’s interpretation of rule 105, a change could have been made only on appeal. We think this is not the meaning of the rule. At least until other proceedings have been taken, the trial court has the power to change its rulings under rule 105 if convinced they are in error. We find no merit in plaintiff’s first assignment.
II. The second, and major, question presented by plaintiff’s appeal is whether, under the circumstances existing as shown by its petition, it is necessary in a suit for contribution for the plaintiff to plead, and prove, its own actionable negligence to the third party injured. Briefly, the case as made by the petition, which is the governing consideration here since the matter was decided upon the pleadings in the trial court, is that the plaintiff’s insured, operating a truck-trailer motor vehicle, was following an automobile owned and driven by the defendant; without signal or warning the defendant suddenly slowed the speed of his automobile so as to bring it to a near stop. Defendant’s car was not equipped with any signaling device for warning traffic in its rear. As a result of the sudden slowing of the defendant’s automobile plaintiff’s insured was faced with an emergency and in order to avoid colliding with defendant’s car the truck-trailer operator applied his brakes and attempted to steer his vehicle so as to avert a collision but was unable to do so and collided with an oncoming automobile driven by one Davis and Davis was instantly killed.
It is further pleaded that a settlement was made with Davis’ estate by the plaintiff on behalf of its insured, in the *833sum of $15,500; and recovery of one half of said sum, or $7750, was asked; the prayer of the petition being “that it [plaintiff] be granted a right of equitable contribution against defendant” and that judgment be rendered against defendant in the amount above set forth, with interest and costs.
The fighting point in the case arises from the allegation in the petition that plaintiff conducted an investigation of the mishap and “the facts of the matter were such, that if the matter had been litigated, the trier of fact might reasonably have found that the plaintiff’s insured was negligent in the operation of his said motor-truck unit at said time and place * * Certain specific negligences of the insured which might have been found by the fact trier were set forth; and it was alleged these might also have been found to have concurred with the negligence of the defendant as being the proximate cause of the accident. Specific negligences of the defendant were also pleaded.
It will be observed that the plaintiff did not plead that its insured was in fact negligent; only that the trier of fact might have found it to be so. The trial court, on its determination of law points, held this to be a fatal defect, and dismissed the petition.
It is not disputed that the right of contribution among tort-feasors may arise where one of them has made á settlement instead.of litigating its liability to the injured third party. We have recently so held. Hawkeye-Seeurity Insurance Co. v. Lowe Construction Co., 251 Iowa 27, 99 N.W.2d 421. Nor does the plaintiff deny that generally the right to contribution among tort-feasors is based upon a common liability to a third party. It presupposes actionable negligence of the tortfeasors making all liable to the third party. Best v. Yerkes, 247 Iowa 800, 805, 77 N.W.2d 23, 26, 27, 60 A. L. R.2d 1354; Constantine v. Scheidel, 249 Iowa 953, 958, 90 N.W.2d 10, 13; Hawkeye-Seeurity Insurance Co. v. Lowe Construction Co., supra, at page 37 of 251 Iowa, pages 428, 429 of 99 N.W.2d; 13 Am. Jur., Contribution, section 51, page 48; 18 C. J. S., Contribution, section 3, page 4.
But the plaintiff thinks this rule should not apply in eases *834where one of the alleged tort-feasors has entered into a settlement with the injured party. It says it has been developed in cases where the injured party has sued one or all of the tortfeasors, or where one sued tort-feasor has impleaded the others and the matter proceeds to trial and judgment against the tortfeasors ; or where the injured party has sued one of the alleged tort-feasors and recovered judgment. But it would have us draw a distinction when one of the tort-feasors has settled with the injured party before trial. In such a case, as in the one now before us, it is contended an alleged tort-feasor should have the right to make a reasonable settlement if it appears a trier of the facts might reasonably have found the settlor liable because of negligence, and it is sufficient to plead and prove this situation. With one exception, no authority is cited by the plaintiff which supports its position. In this connection, the term “joint tort-feasors”, which is commonly used, should in fact be “concurrent tort-feasors”, as is pointed out by Judge Henry Graven of the Federal District Court for the Northern District of Iowa, in Chicago and North Western Ry. Co. v. Chicago, Rock Island & Pacific R. Co., 179 F. Supp. 33. But we conclude, as did the learned Federal Judge, that the term has been so commonly used that it is commonly understood. This usage is confirmed by the definition given in the Uniform Contribution Among Tort-feasors Act, section 1, 9 Uniform Laws Annotated, which says: “For the purposes of this Act the term ‘joint tort-feasors’ means two or more persons jointly or severally liable in tort for the same injury to person or property, whether or not judgment has been recovered against all or some of them.” We use the term in line with this definition, as applying to concurrent tort-feasors.
The sole basis for contribution among joint tort-feasors is a common liability. The cases, including those cited above which so hold, are legion. It is a fundamental principle of the right; without it there is no right. There may be, under proper circumstances, a right to full recovery of sums paid on the theory of subrogation or of full indemnity, as the Wisconsin Supreme Court has pointed out in Farmers Mutual Auto. Ins. Co. v. Milwaukee Auto. Ins. Co., 8 Wis.2d 512, 99 N.W.2d 746, *835750. But contribution will not be available in any case unless there is a common liability. This was emphasized in American Auto. Ins. Co. v. Molling, 239 Minn. 74, 77, 57 N.W.2d 847, 850, where is quoted with approval these statements:
“ ‘Since the right of contribution depends upon the satisfaction, by one of several obligees, of an obligation which would otherwise fall upon all, it is essential that they he equally hound to one principal.’ ” 2 Beach, Modem Equity Jurisprudence, sections 822, 824. Also: “ ‘It is a right which accrues to one or more individuals (out of the whole number bound) who pay the debt for which they are all hound.’ ” 2 Story, Equity Jurisprudence (14th Ed.) section 648. The emphasis is that of the Minnesota Supreme Court, in each quotation.
It is the apparent thought of the plaintiff in the case before us that we should change the basis for contribution by saying that in the case of a settlement by one alleged tort-feasor, it is sufficient if the trier of the facts in a suit by the injured third party might find him actionably negligent; and so, that he need not plead and prove actionable negligence, but only that it might have been found against him. Thus, if its theory is to prevail, he might recover although the trier of fact found him in fact not negligent at all, and so to have had no actual liability to the third party. If we were to adopt this view, we should be laying an entirely new foundation for the action of contribution, which no authority supports. The plaintiff says it is unthinkable that any system of jurisprudence should require it to plead and prove its own negligence in order to recover; or that it might be defeated by a defendant who might say “You were in no manner negligent; the fault was entirely mine.” At first glance, this may seem an appealing argument. But its ready answer is that it is the same system of jurisprudence which gives the right of contribution which prescribes the terms on which the remedy is available. If one who has settled with an injured party is not ready to admit his own negligence in a contribution action, he has mistaken his remedy. He cannot have his cake and eat it. If he thinks he was in fact not liable, he may take an assignment of the claim, or perhaps proceed under a theory of subrogation, in a proper case. But if he elects to recover on a theory of contribution, he must be *836prepared to bring himself within the universally defined rules which govern it.
III. We have said that there is one exception to the statement that no authority is cited which supports the plaintiff’s position. Perhaps we should have said there is no exception; for the one case which could be said to be in line with plaintiff’s contention was promptly disavowed and overruled by the same court. It is Rusch v. Korth, 2 Wis.2d 321, 86 N.W.2d 464. There, the Wisconsin Supreme Court did in fact take a position like that of the plaintiff in the case at bar. After suit but before trial, Korth settled with Rusch, the plaintiff; and asked contribution against an alleged joint tort-feasor, Hemierl. The jury found she had not been negligent, and the trial court entered judgment dismissing her cross-petition asking contribution. The Wisconsin Supreme Court, with two Justices disagreeing on the major ground, reversed. It said that if one alleged tort-feasor who is negligent could recover in an action for contribution, it could see no reason why one who was not negligent at all could not do so. The plaintiff in the case before us concedes this may go too far. But there is no substantial difference between the Wisconsin case and plaintiff’s position. The jury in the instant case might find plaintiff’s insured was not negligent, and yet permit plaintiff to recover contribution under its theory.
In any event, the Wisconsin Supreme Court lost little time in reversing itself. Two years later, in Farmers Mutual Auto. Ins. Co. v. Milwaukee Auto. Ins. Co., supra, it said of Rusch v. Korth, supra: “As a contribution case it stands as an anomaly in the law.” Page 517 of 8 Wis.2d, page 749 of 99 N.W.2d. (And so it does.) It is further said, at page 519 of 8 Wis.2d, page 750 of 99 N.W.2d:
“We did not intend the Korth case to change the traditional law of contribution in this state so as to make it unnecessary for the party seeking contribution to allege and prove his negligence, the negligence of the defendant, and common liability resulting from such joint negligence. The language therein used extending the doctrine of contribution to cases when no common liability -exists at the time of the accident cannot be approved.
*837“* * * this court is of the opinion that, to recover on the basis of contribution, nonintentional negligent tort-feasors must have a common liability to a third person at the time of the accident created by their concurring negligence.” (Italics supplied. )
It should be noted that this language was used in a settlement case; that is, the plaintiff did not allege negligence on the part of its insured, but said it had settled a third-party claim and that the defendant’s insured was negligent in causing the injuries to such party. It was ordered that a demurrer to the petition be sustained.
So in Western Casualty & Surety Co. v. Milwaukee General Construction Co., 213 Wis. 302, 308, 251 N.W. 491, 493, the plaintiff, as insurer, had settled a claim of an injured third party, and asked contribution from the defendant of one half of the amount paid. A demurrer was sustained to the complaint on the ground that no contribution could be had when the plaintiff had settled rather than being forced to pay through a judicial determination. The judgment entered on the demurrer was reversed. In the course of the opinion the court said: “The burden is upon the paying tort-feasor to establish his own negligence and the negligence of the other tort-feasor as the concurring causes of the injuries.”
Additional light is shed upon the question before us by the Uniform Contribution Among Tort-feasors Act, 9 Uniform Laws Annotated, supra, from which we have already quoted the definition of joint tort-feasors, found in section 1. This Act has not been adopted in Iowa; our contribution remedy is based upon the common law. But the entire tenor of the Act shows that in general it follows the common-law principles governing contribution. Thus section 2(1) says, “The right of contribution exists among joint tort-feasors.” In commenting oh the rule established by the Act, a Commissioners’ Note, under section 2, supra, found on page 235 of 9 Uniform Laws Annotated, says: “* * * the old common-law rule [was] that the number of persons commonly liable automatically determined the pro rata share of each in contribution proceedings.” Further sections lay down the rules to be followed when one *838tort-feasor has secured a release from the injured party. Nowhere in the Act is there any intimation that the requirement that there must be a common liability which one tort-feasor has satisfied is different in settlement cases than it is when the liability has been adjudicated in litigation. In fact, the language of section 1, above quoted, clearly indicates that no distinction is made.
The plaintiff thinks settlement of claims in cases where a right of contribution may arise may be discouraged if we do not adopt its theory. We are not persuaded that this is so; but in any event we do not see how we can abrogate the rule that there must be a common liability, pleaded and proved, before the right arises. To do so would be to put contribution upon an entirely new basis, never before recognized or applied by any court except in the now overruled case of Busch v. North, supra. The plaintiff here has not pleaded its own negligence as one of the concurring causes of the injury to Davis. It says only that a trier of the fact might reasonably have found its insured to have been negligent. This means that it would not have been necessary in the case at bar for the fact trier to find actual negligence of the plaintiff’s insured; it might have been found that, while there was a “reasonable probability” such negligence might have been found, there was in fact no negligence. Yet such a finding would have required contribution from the defendant.
The concurring negligence which gives rise to a right of contribution must have existed at the time of the accident. Contribution in this class of cases has as its foundation the thought that, when two parties have contributed to an injury to a third party, it would be unjust to require one who has paid the entire loss to carry the whole burden; the one who hás paid nothing should be required to assume his share. On this point, no authority makes any distinction between cases where negligence has been adjudicated and those in which a settlement was made by one party. As we have pointed out, actions for full indemnity or by subrogation may be available to the settlor in proper cases. But he must decide what remedy he will seek, and he cannot avoid the settled basis for contribution by saying it is difficult to determine which way to go.
*839The plaintiff cites Henke v. Iowa Home Mutual Casualty Co., 249 Iowa 614, 87 N.W.2d 920, to show that this court has put a burden upon an insurance carrier to settle claims against its insured, and urges that we should therefore change the rule requiring pleading and proof of concurring negligence among tort-feasors. The argument is that the Henke case places the insurer between the Evil One and the deep sea; if it settles, it may not exact contribution unless it is prepared to plead and prove the concurring negligence of its insured; if it does not settle, it may be held liable for sums beyond the amount of its policy. First we should note that the case upon which the plaintiff relies at this point is not the Henke case found in 249 Iowa. The correct citation is Henke v. Iowa Home Mutual Casualty Co., 250 Iowa 1123, 97 N.W.2d 168. But plaintiff claims more for the case than it really holds. We said:
“If the insurer has exercised good faith in its dealings with the insured and if the settlement proposal has been fully and fairly considered and decided against, based upon an honest belief that the action could be defeated or the judgment held within the policy limits, and in which respect local counsel have honestly expressed their conclusion, the insurer cannot be held liable even though there is a mistake of judgment in arriving at its conclusion.” Pages 1130 of 250 Iowa, 173 of 97 N.W.2d.
The Henke case was an extreme one, and was based upon bad faith and, perhaps, negligence of the carrier. It does not furnish a basis for the fears which the plaintiff expresses, nor does it have much, if any, bearing upon the question before us.
We find no merit in the plaintiff’s contentions, and decline to depart from the established basis, both in the common law and the Uniform Contribution Among Tort-feasors Act, which rests the right to contribution upon a common liability arising at the time of the accident. The whole matter may be summed up in the statement that before there can be contribution among tort-feasors, there must be tort-feasors. — Affirmed.
Garfield, C. J., and Hays, Peterson and Thornton, JJ., concur. *840Snell, Oliver and Larson, JJ., dissent to Division II. Bliss, J., takes no part.