replaced rear passenger caliper

[polkadot_boxerman]

Ok. So a few days ago I went to bleed my brakes and the rear bleeder valve snapped off in the caliper. So yesterday I went to replace the caliper with one that I purchased from a local bmw yard and bled all the brakes.

When I went to drive the car, the brakes now seem to be seized in place. I was told to jack the car up and just open the bleeder valve to release the pressure and see If I could spin the wheel myself. I will be performing this tomorrow.

Is there anything else that I could test? I didn't take the rotor off when I replaced the caliper. Just popped the old one off, and put the new one on.

[jlevie]

The first check would be to get the car up in the air and see which caliper(s) are stuck. The cause could be a soft brake line, stuck caliper piston, or a problem with the ABS unit.

[polkadot_boxerman]

I'm assuming that none of these can be fixed. Only replaced?

How can you tell whether it's the stuck caliper or a bad line?

Everything worked before the swap and bleeding. So I'm leaning towards the caliper itself. I did use a power bleeder though.

[M-technik-3]

That's the issue with buying a used caliper, you have no clue as to it's overall condition.

[jlevie]

If the problem is one of the soft lines, cracking the line where the soft line transitions to the hard line won't release the piston. It that does release the piston the problem is further upstream. But is the locked wheel is the one with the junkyard caliper, the odds are good that it is the caliper and that caliper needs to be rebuilt or replaced.