HELP abs code 51. What do I fix ?

[Malleus]

Evaporust, or the homebrew version, which is my choice

Do not use acid, which both Ospho and naval jelly are

 

[smorkington]

I have a used abs pump I’m trying to get rid of. Imo just delete it though.

 

[jht3]

not deleting it. i've had it engage on the street and glad it did. prior to this issue, everything braking was working great.

a few years ago i put new calipers on all 4 corners, new rotors, new pads, and bled everything. engaged ABS on the street, and bled again. i'm due for another bleed job, and then this happened.

trying to decide if its easier to pull the pump out, or attempt pulling the bell with the brake lines still attached.

 

[jht3]

tried jumping the harness. i get a faint click. banged on the metal housing with a hammer. rinse and repeat. took it for a drive and after a few feet the light comes back on

so i pulled the stator (??) cap off. a little rusty in there. not as bad as some of these pics however. what EXACTLY do i need to focus on cleaning up? is there a continuity test or something i can do to ensure its working before trying to put this cap back on? i have the brushes reinstalled and held back w/ zip ties at the moment, and will try the socket method to get this back on. hopefully enough clearance on the metal bracket his pump sits in, as there isn't enough wiggle room to slide the bracket off.

when trying to spin the motor by hand, it only moves a few degrees left or right, then locks up hard. should this spin easily when still installed in the truck?

put it all back together. cleared codes. 51 returns after 5'. argh. guess this motor is locked up, like the code says. time for a new unit

 

[98 SNAKE EATER]

When you say it only moves a few degrees before locking up, does it feel like a mechanical lock (like a siezed bearing or broken winding) or a fluid lock (as if it's trying to compress fluid)?

If it feels like a fluid lock, try removing the lines one by one while turning to pinpoint which output is causing the lock.

 

[jht3]

When you say it only moves a few degrees before locking up, does it feel like a mechanical lock (like a siezed bearing or broken winding) or a fluid lock (as if it's trying to compress fluid)?

If it feels like a fluid lock, try removing the lines one by one while turning to pinpoint which output is causing the lock.

like it just hits a wall in either direction. one side has a bit of "stick" to it as well, like its getting caught on something. no squish at all.

possibly a seized bearing. not sure what a broken winding would feel like.

i'm not familiar enough with how this should all work. when jumping the motor with the wheel solenoids closed, should it spin?

shot a bunch of electronics cleaner into the case, and blasted it with compressed air. no change.

moisture got in there somehow and the silver plate is basically gone where it sits at the 6 o'clock position. the lower two brush holders are tilted up and making contact w/ the outer magnets. i tried scraping as much metal flakes off and bending the holders back flat. i've had it apart, and put all back together with no change at all. basically i'm not sure its worth messing w/ any longer and need to source either one in better condition, or new.