Rear brakes dragging, opinions?
#11
2004 F150 5.4 Lariat
Ok so I just started the car and jammed the brake pedal repeatedly for a minute as hard as I could and then cracked the bleeders open and nothing squirted out. Just a small drop leaked from each. So I conclude that somehow both calipers are failing and getting sticky. I guess I will just replace them then.
If you put everything back together but the tires,
then press the brake pedal a few times, and both rotors are stuck, that'll confirm that the problem is with both wheels. If both are stuck, then you can bleed some fluid out of each wheel to make sure that the fluid flows properly. If it does it's likely that the caliper piston(s) is sticking. You might be able to free them up by prying the caliper piston(s) back in, pressing the brake pedal, and repeating this a few times. Maybe squirt some WD40 around the rubber boots too. If this doesn't work you'll need to rebuild or replace the caliper(s).
Good luck.
#12
I don't understand because I'm thinking that you have to press the brake pedal with the bleeder valve loose to get brake fluid out. So getting a drop out without pressing the brake pedal is what I would expect.
If you put everything back together but the tires,
then press the brake pedal a few times, and both rotors are stuck, that'll confirm that the problem is with both wheels. If both are stuck, then you can bleed some fluid out of each wheel to make sure that the fluid flows properly. If it does it's likely that the caliper piston(s) is sticking. You might be able to free them up by prying the caliper piston(s) back in, pressing the brake pedal, and repeating this a few times. Maybe squirt some WD40 around the rubber boots too. If this doesn't work you'll need to rebuild or replace the caliper(s).
Good luck.
If you put everything back together but the tires,
then press the brake pedal a few times, and both rotors are stuck, that'll confirm that the problem is with both wheels. If both are stuck, then you can bleed some fluid out of each wheel to make sure that the fluid flows properly. If it does it's likely that the caliper piston(s) is sticking. You might be able to free them up by prying the caliper piston(s) back in, pressing the brake pedal, and repeating this a few times. Maybe squirt some WD40 around the rubber boots too. If this doesn't work you'll need to rebuild or replace the caliper(s).
Good luck.
If the hose was collapsed internally then cracking the bleeder would spew a bit of fluid out due to pressure being stuck in the calipers, despite pedal released.
If the caliper is just siezed then releasing the pressure would spew no fluid and the brakes would still be dragging.
That is what I was getting at and that is what I experienced.
I have replaced them and so far so good. And FWIW a quick clamp in reverse between the pedal and seat is what I used to bleed the brakes on my own.
Will report back with an update in a few days for the sake of record keeping.
Appreciate everyones’ input.
#13
Mark
iTrader: (1)
mystery solved. Thanks
#14
Senior Member
I had an issue with the actual metal "horns" under the sliders for the pads actually expanding from rust and crud, literally locking the pads in place. Wrecked a rotor and pads set.
#15
#16
05 5.4l 3v s.crew lariat
Well I went thru this on the fronts on 2wd 05 . Yes you must be careful of lubing the pins don't get it on the end of the pin . But after burning up rotor bearings on the fronts intermittently and re-lubing everything I had to change out calipers for remans . Seems after a brake job they want to stick intermittently after being pushed back in. The pistons are composite and absorb moisture when extended after being pushed back in they then stick intermittently making the wheels and stuff super hot . Only fix is remans .
I would always bleed all the brake fluid out of the caliper as it gets really bad after being boiled many times . Don't push that fluid back towards abs ,open bleeder and push it outside . Empty and change all brake fluid with brand new. Get that water absorbing stuff out of there before rust takes over .
I would always bleed all the brake fluid out of the caliper as it gets really bad after being boiled many times . Don't push that fluid back towards abs ,open bleeder and push it outside . Empty and change all brake fluid with brand new. Get that water absorbing stuff out of there before rust takes over .