2001 GMC C6500 8.1 engine box truck
My service park break light came on while driving. The beeping as well. When I stopped to check it out. #31 was leaking and the reservoir was empty. I filled it back with trans fluid and it stopped the beeping and the light went off. It only lasted about 25 miles though. What's the proper name of this part #31? And is it worth replacing or just install a manual hand break?