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i have a 78 luv and my back 2 brakes lock up on me when i give them a load, i can tell my front brakes should be doing alot more work than they are. the truck is bone stock just the way i like it and it have 27000 miles on it needless to say the brakes are not worn at all im not too smart on the brakes so i was woundering on some cheap fixes for me any ideas????

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Check your master cylinder.Might be the valve the controls the amount of pressure goes to the front and rear brakes(proportioning valve). Check your fluid levels.Even with that few of miles the master cylinder can be shot from sitting for so long.Check your brake lines,rubber and steel for leaks and cracks.Replace any cracked or selling rubber lines.Color of brake fluid should be clear,not dark brown,if it is brown you have water in your brake system,bleed out old fluid with appropriate dot number brake fluid. It might even be your brake booster.Also check the valve and hose to the brake booster...sometimes these cause problems too...Good Luck!

The most likely problems are old, weak springs, sticking hardware, or gunked up wheel cylinders. One other thing is the hose could be working like a one way valve. Unless you know it is less than 5 years old, I would replace it. I replaced all the hoses on my 77 for the second time last year just because.

If the shoes still have plenty of lining, remove everything and replace or rebuild it. I often rebuild wheel cylinders without removing them. Removing them requires removing bolts and lines that may be long frozen. As long as the lines aren't rust pitted, I would leave them alone.