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Calipers do seize up, the pistons mostly. If there are a lot of miles on the vehicle (60,000 miles) and a caliper seizes, the one on the other side will follow shortly. Consider replacing them both. Two other possibilities are: guide pins not sliding for some reason, flexible brake hose collapsed internally. Most likely it's the piston issue.Calipers do seize up, the pistons mostly. If there are a lot of miles on the vehicle (60,000 miles) and a caliper seizes, the one on the other side will follow shortly. Consider replacing them both. Two other possibilities are: guide pins not sliding for some reason, flexible brake hose collapsed internally. Replace all. The flex brake lines do become restricted, causing the caliper to delay in retracting, or sticking.