A320 flight crew reported they had no brakes on taxi in to the gate; and were able to bring the aircraft to a stop using the parking brake. It was apparent after inspection that the green hydraulic system had lost its fluid.
Synopsis
A320 flight crew reported they had no brakes on taxi in to the gate; and were able to bring the aircraft to a stop using the parking brake. It was apparent after inspection that the green hydraulic system had lost its fluid.
Narrative
First Officer landed at ZZZZ runway XXL at XA00. He used full reverse and then braking. A normal aircraft transition occurred and I exited the runway on taxiway 1 holding short of runway XXR. No indications of any braking problems. FO completed after landing flows; we discussed keeping #2 engine running until we crossed parallel runway. After several departures/landings on XXR we were cleared to cross XXR behind a 727 and check in with Ground. Ground cleared us to gate XX via northbound on taxiway 2. The FO shut down #2 engine and I taxied north on 2 to abeam the gate. I made the left turn towards the gate with no braking issues noted. There seems to be a little dip in the apron and as the main gear crossed over it I noted our speed slowed to 1 knot of ground speed on the PFD (Primary Flight Display). I added a little power to keep aircraft moving; then back to idle. As I approached the stopping point I glanced at PFD and saw 2 knots; as the Ground Handler crossed the wands for us to stop I applied additional pressure to the brakes and the pedals seem to go limp and all the way forward with no additional braking. I told the FO to check your brakes" he quickly responded they were not working. I set the parking brake and the aircraft surprisingly came to a very smooth stop. Both sets of brake pedals were non responsive and were physically all the way forward. Ground crews placed chocks and gave the signal. It took a bit of time for them to get communications connected and clarify what happened. During the 5-8 seconds of the event happening we probably rolled forward of the planned stopping spot by ~12-15 feet. It then took about an additional 5 plus minutes to get a tractor hooked up and the aircraft pushed back to the correct position for the jet bridge and start deplaning. As soon as jet bridge was hooked up; Maintenance personnel were right onboard as were we writing up the Maintenance Request. He had photos of the leak that appears to have started about half way down the lead in line. We checked the hydraulic page and the green system quantity was very low."
Second reporter narrative
After landing on XXL and taxiing across XXR to our gate XX; as we were marshalled in to stop; the Captain said No brakes". I immediately jumped on mine and pushed them all the way to the floor. We probably rolled another 8 feet before we could get it stopped with the parking brake. Aircraft stopped smoother than expected with the parking brake. No one was injured thankfully! Shortly after the ramp reached out to us so we could get pushed back to our original line - this was uneventful. After the jet bridge was pulled up; a Maintenance guy came into the flight deck and told us that our right main gear had leaked hydraulic fluid everywhere. This clearly explained why our brakes gave out. Aircraft was taken out of service to fix."
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.