Hi, before I go off and buy some new brake hoses, I'd like to get a second or third opinion please?

I have a 2000 Silverado 1500, ext cab, 4x4, auto, 5.3L, with 220k miles on it.

I last few times I've taking the truck on longer trips up and down the mountains where I live, I've been experiencing the rear brakes locking up on me! I thought that it was only happening on the pass side, so I took that wheel off not long ago and re-lubed up the caliber bolts/pistons(?) to make sure they were moving/working. Note; I also put on new rotors and pads last year. Rotors don't look bad and pads look good still. Well, that didn't work because it did it again! And, this time it felt like both rear sides were locking up, and the brake pedal strangely got spongy? Both rear brakes/wheels were super hot, but not fluid loss. After everything cools down, it's back to good working condition again.

So, considering that this rear brake failure/drag is only happening when the truck brakes are hot, I'm guessing that it could be the rubber hoses expanding and causing the fluid not to get to the calibers? So, if I replace the hoses I should be good to go? I will add this, that the brake fluid looks like dark coffee too! I'm not sure old brake fluid would cause this alone, could it? Could it be the master cylinder? Any other ideas or suggestions?

Thanks for all your time and help!

Todd

 

can you push the pistons back easily with a piston compressor? the caliper pistons may be seized. crack the bleeder screw open...if they still won't push back...you need calipers

do not use a c clamp...this tool can push back a seized piston,

 

You know what, I never did check the piston, I just lubed up the caliper retaining bolts. However, if the piston was seized, wouldn't it be done for period, meaning the changes in temperture wouldn't make a difference?

Did you mean, don't use a C clamp...this tool CAN'T push back a seized piston? Thanks!

 

No
if you use a tool than can push back even a seized caliper....how do you know if its stuck or not. the proper tool won't move a seized piston.