Noticed some fluid on my rear caliper and traced it to the welch cap above the e brake actuator arm. Does not leak with normal brake pedal actuation but if the e brake is engaged a small amount of fluid weeps out of a area between the cap and caliper housing Can this plug be sealed with a new cap or does the caliper need to be entirely rebuilt?

There looks to be two half round cutouts where the cap seats and that is where the leak is. Seemed like there was some sort of sealant that chipped away as I was cleaning the area.

May be leaking as it's not a true welch plug. Looks like a plug that was glued in, not pressed.

There shouldn't be fluid behind that plug. An internal seal has failed, you need a rebuilt caliper.

the plugs are always replaced when the calipers are rebuilt

I know Eric at PMB has them, I made them for him. They are not an on the shelf item, so he needed them to do a correct rebuild. Probably why the plug is just that.

Ed is correct. The inner adjuster seal has failed. The handbrake arm shaft should not see fluid.

The welch plugs come in our rebuild kits.

https://www.pmbperformance.com/catalog/item...563/4747449.htm

Click to view attachment

Hope that helps!

Thanks for the replies. Sounds like I will be ordering some PMB calipers.