Rear caliper piston fell apart

[wbhokie]

Good thread. Short with good information and lessons learned.

 

[ngogas]

Looks great. Glad it worked out and ranger helped.

 

[Msjulie]

Umm. All Tesla’s to date have a 12V.

Except for very early Roadsters

Glad it worked out and glad to learn about the e-brake connection at the caliper, mentally filed away in just-in-case folder..

 

[rtanov]

YES! so the tesla ranger was a great help. He showed me where the ebrake can be unplugged. He reinstalled the dustboot, retracted the piston and helped bleed the system. I took the car for a drive and the pedal response is good.

What tool did he use to bleed the system?

I've tried a pressure pump attached to the master reservoir but could not find an attachment cap that would fit tight without leaking air out. I also tried a vacuum bleeder at the calipers and that was successful but the problem with that is that it sucks air around the nipple thread so it is hard to determine when you've sucked all the air out of the system.

 

[phtp]

I realize this is an old post, but good for removing the caliper to paint it. I've seen some that paint over the brake pads and other components which shouldn't have been painted.

 

[Evoixse]

i have a similar problem. the tow mode after a few minutes engaged the parking brake while i had the pad all taken out and during the panic i wasnt quick enough to think about unplugging the sensor. but now i can get the piston to retract. i have a performance but it seems that the caliper is similarly setup. the rear torx pushes the piston out but when i try to back it in while i apply pressure it retracts to a certain point and wont budge. feels like something is behind the piston is holding its position. i've even tried backing the torx screw it all the way down and it does want to give. doe this piston need to be twisted at all while pushing? thanks for the help.

 

[Msjulie]

@Evoixse Have you tried going back to the screen and setting tow mode again? If you force it otherwise, I fear you will damage the gears and/or electric motor...

 

[Evoixse]

@Msjulie i have the electric praking brake motor taken off already and unplugged. i cant get the piston to fully collapse for some reason. its sticking out 1.5inches and doesnt want to go down any further. here is a picture to help better understand where its stuck at.

 

[Msjulie]

I wonder if the piston jumped the internal gear...