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Hello, what kind of ford is this? 2 or***** What did you replace, pads and rotors? Front or rear?
Not the abs light but the red brake warning light will come on. Just compressing the pistons in the caliper without removing the cap will not cause the abs light to come on. Four wheel drive what? F150, 250, expedition?
Ok the front rotors are just top hat rotors that sit on the hubs. Either you somehow damaged one of the front wheel speed sensors wires or the tone wheel the sensor reads off of or you have a different issue. But it will not be caused by leaving the master cylinder cap on. Inspect the front sensor wires and the tone wheels for damage and repair as necessary. Otherwise you will need to get a scan tool capable of communicating with the abs module and see what code or codes are stored to find out what the issue is with the system.
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