Peter, tell me more. I thought these were absolutely disposable, not fixable. If it can be a stuck piston, I'll go at it from that angle. But, could you give more info on it. Especially, how to use the brake pedal to unstick a stuck piston.
Any info is more than I have now.
debi

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...debi

1971 250
1972 220D
1993 Lexus ES300