The Hyundai branch of the Korean Metal Workers Union will hold partial strikes this week after the automaker made a wage offer equal to roughly half of what the union had sought.

Unionized workers will strike at all six of Hyundai’s vehicle plants in Korea for four hours Wednesday, followed by 6-hour walkouts both Thursday and Friday. It would be the union’s fourth strike against Hyundai in as many years.

Talks broke down ahead of the customary deadline for reaching a contract agreement before the country’s Chuseok Thanksgiving holiday.

Hyundai has given no indication it will accede to the union’s demands, which include substantial bonuses and restricting of the retirement-age policy in addition to a wage hike.

“There is nothing to be gained from a strike that ignores reality," Yoon Gap Han, Hyundai president for plants and production, says in a statement. A strike could hurt the brand in Korea and lead to “customer defections,” he adds.

Union president Lee Kyung-hoon says, meanwhile, that the automaker’s last offer made Sept. 15 was “unreasonable and provided without careful thought.”

A walkout would disrupt production not only at Hyundai but also at the automaker’s Kia affiliate. Of Kia’s more than 31,000 union members, nearly 73% cast ballots and a majority voted Sept. 16 to strike.

According to the union website Hyundai management offered to raise workers’ average monthly pay by 79,000 won ($67), plus bonuses of 2 million won ($1,700) and three months’ average salary, as well as a rollback in assembly-line working hours.

The union seeks double what the company has offered: a 159,900 won ($136), or a 7.8%, average increase in monthly pay, bonuses equivalent to 30% of Hyundai’s 2014 net profit and an extension of the worker retirement age from 58 to 65.

The union also rejected Hyundai’s plan to introduce a peak wage system. The automaker presented the plan at the bargaining table three weeks ago and the union threatened to break off negotiations if the issue was raised again.

The Korean Confederation of Trade Unions, Korea’s second-largest trade union umbrella group, to which Hyundai’s KMWU belongs, is a staunch opponent of the peak wage system. It has strongly denounced it, holding public demonstrations and urging national strike action.