Brakes locked up on my truck

I have a 1989 GMC K2500 plow truck w/83k miles on it. A month ago the brakes locked up on the front driver side. I got a new caliper and replaced it. Brakes still locked up. I could not for the life of me figure out what was causing the brakes to lock up just on one side. Thankfully I know several mechanics who told me it was the brake hose. I guess they collapse on the inside and act as a 1 way valve. I replaced the hose today (after soaking the fittings in PB blaster for 2 weeks, which is another thread) and the brakes work great. I am going to change the other side next and the rear has already been done. I thought I would share this with anyone who may have this problem and are as clueless as me.

I'm going to chip in here and say anybody looking to replace flexlines in a brake system look long and hard at using Stainless Steel flexlines instead of the OEM rubber type. World of difference in pedal feel and brake "bite".

I've had brake lines let go on me, too. I have gotten in this habit every time I leave the driveway - I stop and push the brake pedal HARD for a couple of seconds. The theory is that I'd pop a weak brake line there, instead of on the long steep downhills we have here. No guarantee, but it makes some sense to me.

I've popped a few rusty brake lines too. It can be scary. I have replaced the steel lines on every truck I have owned over the last 20 years or so. Gotta love all that salt on the roads. This last mild winter probably added two years to the lives of most cars in the Northeast.

Not worth the extra cost on an old beater farm truck though.

It is if you have to replace all the flex lines, the cost difference is minimal. But yeah, on a beater, pedal feel ain't my highest priority either.

If any of you have an early 2000's Chevy or GMC truck check the brake lines that run along the frame just under the drivers door.
Mine rusted through. After checking into it this isn't an uncommon problem.
Luckly I was sitting in my driveway when it happened.

Same with the 2000 Taurus I had. The idiots in Detroit put a plastic piece under the brake lines to protect then, but all the plastic did was catch and hold water, which rusted the lines through. P-poor design!

A notoriously weak spot on those trucks. I completely re-did a 2000 1500 for a friend and am in no hurry to repeat that experience. Along with the ABS sensor failures and parking brake failuress that are due to rust/dirt there are several issues on these trucks that are caused by a lack of corrosion resistance/cheap materials. Actually the brake line replacement wasn't the end of the world but I just couldn't close my eyes to all the other issues so after scraping the frame and re-undercoating it, replacing the rear brake disc's and pads, right rear parking brake assembly, both front brake calipers/pads, every flexline was replaced with braided SS lines from Goodrich and all hard lines are now run with a new corrosion proof Copper/Nickel alloy tubing. If I had it to do again, I discovered a company making Stainless Steel hardline kits for those trucks that I'd consider over hand fabricating each line as I did.

Living in the salt belt up north I would like to custom build a rust proof jeep, I would start with a galvanized frame, all SS brake and fuel lines, and a fiberglass body with full roll bars. I would use a CJ frame from th 80's so it wouldn't have to meet new emission standards.