A320 captain reported refusing an aircraft due to faulty braking systems.

Attributes
ACN	1730082
Time
Date	202002
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	Parked
Flight Plan	IFR
Component
Aircraft Component	Brake System
Person 1
Function	Captain
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 111 Flight Crew Total 2546 Flight Crew Type 879
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

The plane had a deferred green hydraulic braking system as well as a deferred number 4 brake. This left the plane with no auto brakes and asymmetric braking due to having two brakes on the left main gear and only one on the right gear. The flight was released to fly to ZZZ where it had been snowing for three hours with 1/8 inch slush and snow on the runway. Due to conditions and degraded braking ability; I refused the aircraft. Dispatch; maintenance; and [other appropriate departments] were briefed. A new plane was brought from the hangar and the flight continued two hours late.

Original NASA ASRS Text

Title: A320 Captain reported refusing an aircraft due to faulty braking systems.

Narrative: The plane had a deferred green hydraulic braking system as well as a deferred number 4 brake. This left the plane with no auto brakes and asymmetric braking due to having two brakes on the left main gear and only one on the right gear. The flight was released to fly to ZZZ where it had been snowing for three hours with 1/8 inch slush and snow on the runway. Due to conditions and degraded braking ability; I refused the aircraft. Dispatch; Maintenance; and [other appropriate departments] were briefed. A new plane was brought from the hangar and the flight continued two hours late.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.