Henry, if you replaced the calipers 18 months ago then you should know what calipers you bought. Don't understand why you're asking for help identifying the brand caliper. It's difficult to imagine you're having brake system problems when you essentially rebuilt the system 18 months ago. Did you bleed the entire system and install all new brake fluid?

Rather than rebuilding the caliper I agree with Ismalley ... check prices for the proper caliper at a salvage yard.

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Fred Hoelzle