Both hoses ...... close to the same time.

Something happened to those hoses

 

Sounds like someone hung the calipers by the hoses, or used some type of clamping pliers on them to prevent the fluid from leaking out.

 

The left side was the one that locked up, We are replacing the same parts on both sides to make sure everything is up to par.

 

Sorry, didn't read it that way with "hoses".

If you ashed the boots those temps got way higher then 500F. Ford used to have us run a test with the Excursions for pad flaming. This was because they expected the German magazine Auto Motor und Sport (AMuS) to put the vehicle through its normal paces, one of which was to see how brakes would do under severe mountain tests. All of us hated that because we would beat the crap out of the vehicles and then have to stand next to each front wheel and record the burn time while smoke and a terrible odor would be bellowing out of the wheel wells. The seals and pistons would be "toast". We changed calipers with each of our tests, but these were the worst to change due to the odor. Our temps were in the 1200-1500F range, but yours might not have gotten that high as you didn't have the stainless steel heat shield that was incorporated in the early launch vehicles, think of Space Shuttle insulation tiles.

 

I played the caliper rebuild game to many times. Then I learned I could buy brand new ones for $70 a pop. all 4 calipers, rotors, and pads for $400. Bled the system, and my truck has never stopped better.

 

Truck is up and running, my buddy drove it 40 miles today, brake rotors stayed around 140 degrees. He will drive it some more tomorrow.

 

While its always dependent on the driving conditions, that's about normal for most people. Under the cold temperature test parameter for the edge codes, by about 100F!

 

Jack, I am not sure of the right hose collapsing but that caliper did get hot. The left was so hot the truck wanted to make a left turn.

This is the first failure on the road the Ex has had. I have owned it since 76,000 miles, it now has 160,000 on it. Fortunately it happened close to home, we were not towing and nobody got hurt.

 

The side that overheated either had the hose trap the fluid, or something at the foundation brake hung. Either way, it would make a mess. Fluid or hard parts trapped just gets worse for pull as the drag continues, the parts heat up and swell, applying more force. It will continue to do so until you fully cool down or the friction material fades. If the wheel brake is locked, with a full cooldown the materials shrink plus you've worn off some friction material and you can move on. Sometimes a long distance or until the next brake application.

Ranger drum brakes could overadjust and get into that situation. We could have that during road brake tests or burnish. I was burnishing one of the test trucks out in our cranberry bog region and had it climb up, easily seen when you have thermocouples in each brake. Pulled over at one of the streams and sacrificed my Poland Spring to repeatedly cool down the assembly over 10 minutes. Never occurred again for the rest of the burnish and the test driver never had an issue during the performance section. Just weird.

In the F350 glove compartment, I have a 10 (12?)mm wrench just for the bleeder screw in case it ever goes wrong. First, if there's pressure relief I know it's a hose, plus it relieves the pressure and I can move on. well, as long as I minimally press the brake pedal to get out of park. Internal tears in the hose can block fluid in either direction, releasing the caliper or preventing it from applying. It just depends on which side of the tear the liner delaminates. Blocking the flow to the caliper will be a cold brake.

 

Picked her up and she stops great!

 

didnt it stop great before??? lol was just applying the brakes a bit more than you were wanting lol...