Yesterday morning I went out to got to work and when I stepped on the brake to put the truck in gear, The pedal went soft and the abs light and brake light went on. I see no fluid leaking anywhere and the master cylinder is still full. Is this a faulty master cylinder? Original 1994 master cylinder. 1994 Ram 1500.

 

Check the line above the gas tank.

 

Thanks for your reply. Will check after work.

 

symptoms of worn out seals in master cylinder -
brake pedal starts out a little mushy, but firms up after a couple of pumps.
when sitting at red light with foot on brake, pedal sloooooowwwwwly falls to floor.
no leaks, m/c stays full.

 

Checked after work and found a very small leak in the line running from front to back along the frame right after the gas tank. Time to run to the part store. Thanks for the help.

 

Glad you found the problem. Inexpensive fix too.