EMB ERJ 170/175 ER/LR
Flight Crew Air Transport Pilot (ATP)
Fatigue
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
General Flight Cancelled / Delayed; General Work Refused
Aircraft; Human Factors
I had a long; challenging day. One contributing factor was a van departure at XA:10 for a XA:50 check in. Typically; the van would depart at XA:30; but they had us go earlier due to shuttle availability. Additionally; this trip and preceding trips had various irregularities such as schedule changes and lengthy mechanical delays. This particular day was quite challenging. Our day was getting close to max FDP prior to the last leg. During my walk-around prior to the last leg; I observed what appeared to be hydraulic fluid near one of the brake calipers. Maintenance notified. The Maintenance Technician pumped the brakes; cleaned the area; and signed the logbook. I did not feel comfortable with this and spoke with the Duty Officer; Maintenance Technician; and Flight Operations Director. I explained that I experienced an identical problem in the past where the test was conducted (seemingly successfully); but on the next flight; brake fluid sprayed out and the caliper had to be replaced. It took a lot of discussion and explanation before I felt safe accepting the aircraft. By that time; I was fatigued from an intense day. I elected to report fatigued. At XL:48; we were provided rest until XX:15.
E175 Captain reported calling in fatigued after a long challenging day involving maintenance delays.