repeated brake seizure in front corner

[breadbooze]

Has anyone experienced repeated caliper seizure in one front corner? I have macan calipers up front and one of them seized a few days ago, where the outer pad wasnt retracting without releasing brake pressure using the bleeder, so I swapped the OE calipers back in. They worked fine after bleeding them but then a short drive the next day and the same front corner has seized again. Meanwhile I rebuilt the macan caliper with new seals and grease, verified the pistons extended and retracted properly and swapped those back in and once again the same corner seized after going on a drive. I am beginning to suspect the ABS pump but there are no codes stored in the module, or perhaps a collapsed brake line? is there anything else I should look for?

 

[EEeegolf]

We had this on two cars. Both on stock calipers.
I tried cleaning and checking everything. Couldn't find any problem. Still continued. Bleeded the brakes. Helped a bit but problem came back. Changed to a new caliper and it worked.
Second car I just changed the caliper and problem went away. Still can't understand what was wrong.

 

[breadbooze]

We had this on two cars. Both on stock calipers.
I tried cleaning and checking everything. Couldn't find any problem. Still continued. Bleeded the brakes. Helped a bit but problem came back. Changed to a new caliper and it worked.
Second car I just changed the caliper and problem went away. Still can't understand what was wrong.

Thanks, I tried another caliper and it still locked up. Traced the brake line, no kinks between the hose to the caliper and the ABS module. If it was the MC the other side would have locked up too, but there was no brake pressure to relieve when the affected corner locked up. Something in the ABS valve body is keeping the pressure on that corner. I've ordered an ABS module and will swap it out to see if that resolves it.

 

[breadbooze]

For future reference, the ABS module was the culprit. One of the solenoids was not releasing brake pressure to the corner. Pressure bleeding it resolved it briefly until the solenoid locked up again.

 

[EEeegolf]

Could you repair it or how did you get it fixed?

 

[breadbooze]

Could you repair it or how did you get it fixed?

Replaced the ABS module, coded it, ran a few basic settings in modules 03 and 44, cleared faults. The toughest part was figuring out the coding since I used a not quite the same module (different version). installing the module had its challenges with threading the compression nuts in. If anyone decides to replace their ABS module make it less of a headache on yourself and match up the part number and software version exactly.