Atyptical brake caliper failure?

I'd go with a collapsing hose.

All of the above are valid. Look also to the ABS sending unit or the ABS pump, or possibly the ABS computer. If any are malfunctioning, the caliper will think it is in "emergency" mode, and will continue to engage the ABS system.

It could also be a plain, old-fashioned, sticking caliper slide pin. Disassemble the RF brake system, lube the slide pins, and check for a circuit interrupt in the ABS wire. The Master is not the source of the problem.

It is unlikely that a caliper piston could be sticking if it compresses easily. A defective or damaged metering valve could also be the culprit, but that is about as common as a tornado in Southern CA.: it could happen, but not bloody likely.

Without being able to actually look at your vehicle, all I can offer are guesses.

the two with a piston depressing gadget or a C-Clamp and block of timber. appropriate thank you to do it is to take the lid off of the grasp cylinder and canopy the hollow with a rag. shall we the back rigidity ease off a sprint less demanding. next, place the pad ingredient of an old wreck pad against the piston and use the piston depressor to recess the piston. that's consumer-friendly. It basically makes use of rigidity on the back of the caliper and with a screw in device, presses the piston back in. in case you haven't any longer have been given a type of, get a C-Clamp and a chew of timber. Press the block of timber against the piston and slowly press the piston back in with the clamp. I doubt it being a ninety 8 that's a malicious application kit piston yet verify to be sure. some calipers (back, I exceptionally doubt it) use a malicious application kit to resses the piston. verify for a hex nut on the ingredient of the caliper and change that counter clockwise.

the caliper mounting should be clean.also i have seen the flex hose com apart internally,and therefore not release the pressure when you let off the pedal.

You may have a brake line hose that is crimped or bent such that the fluid is not flowing properly.