Front drum brakes keep tightening/self adjusting

[aschafer14]

I'm on a road trip and my front brakes keep over adjusting or somehow they are dragging. I have stopped several times to back off the star wheel adjuster and it works for a bit but after using the brakes lightly they re-adjust. I Jack up the wheels and they are hard to turn. There isn't any play in the hub/well and it spins freely when re adjusted. Has anyone had this happen?

2004 Fuso FG 649

 

[Czechsix]

Good possibility it's your soft brake hoses that are swelling internally and preventing bleed off. I replace hoses every five to eight years or so, on all vehicles.

 

[aschafer14]

Good possibility it's your soft brake hoses that are swelling internally and preventing bleed off. I replace hoses every five to eight years or so, on all vehicles.

Interesting, that does sound plausible. So theoretically I should be able to crack open the bleeder screws to relieve the pressure and the wheels should spin freely. I'll have to check this out later today.

I wonder if there are any aftermarket steel braided lines that might fit and have a longer life.

Does anyone have part numbers for these, I'm away from my home computer with the parts catalog

 

[aschafer14]

Just got under the truck and cracked the bleeder screw and sure enough fluid streamed out and I could hear the shoes retract. Now I just need to find some parts with the holiday. They look like pretty generic lines, if anyone has some part numbers I'd be very grateful

 

[glennm01]

I'm pretty sure the front OEM part number is MH033200.

 

[aschafer14]

I had some more time to look over things and the brakes will release if I pump the pedal with the motor off. Once I start the truck and press the brake the booster builds up vacuum and won't allow them to release all the way. If I unplug the vacuum line to booster they will release again when I pump the brakes.

I've been trying to adjust the brake pedal to make sure it has enough free play but cannot figure out how to rotate the shaft once I loosen the lock nut.

Someone was definitely already messing with the booster as the clamp on the vacuum hose was already off.

 

[aschafer14]

Welp I may have just had a Christmas miracle. It all the sudden started working like normal. The only thing I can think I did was somehow reset the diaphragm in the booster when I was blowing and sucking into the vacuume line to test the check valve. We'll see if it holds.