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Caliper piston seal

Brakes

Vehicle Information: Model: 911; Year: 1973; Body Type: Coupe; Engine (type, size, modifications): 3.2L carbs, SSIs; Total Mileage: 100k;

I just removed a pad from the rear brake on my car (the brakes, like the entire rear banana arm are from a 1977 911).I discovered that the rubber seal over the piston is damaged. The inner edge of it is torn off. It looks like it still seals ok at the outer edge. I would really like to avoid pulling the whole caliper off and rebuilding it right now...How critical is this? Can I drive the car this summer (it's dry here all summer) and fix it this coming winter? Or am I just asking to kill myself if I do this?

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