Ok, I bought this sweet 1952 GMC 1/2 ton, all stock, in very nice condition, I am driving here and there to get a good feel for everything and to just "shake down" the truck.
All new brake components were installed 3 years ago, all stock. After driving truck for a while the brake pedel gets real hard and will not travel at all and before you know it all of the brakes are fully locked up. At first when this happeded I checked the brake fuild and there was barely any in the master cylinder. I know, should have known better to check this before driving/purchase but I got so excited I forgot. So, I added fluid and the brakes looseneed up and I was back in business. In the back of my mind I'm thinking I better bleed these brakes and re-fill the fluid to makes things right. Well, I have not had time to bleed the brakes but after dinner this truck kept calling me out for a drive, so I went for a little cruise and sure enough the brake pedal got hard with no travel and the brakes locked up again. This time when I checked the fluid it was full, but very murky in color and I could not see through it. I un-hooked the brake linkage to the pedal so all is good there, it must be a pressure/fluid/air problem. No leaks anywhere in the brake system.
I'm thinking there must be air or debri in the system, and a full brake system fluid flush is in order and then bleed brakes as per service manual. I am just looking for advice/opinion, and or has anyone else here had this happen?
Thanks in advance, and I will post pictures of this fine truck very soon.
