I have a 2007 GX 470. the actuator was replaced in 1/2015. the rear right brake line popped (busted) in Nov 2015. it keeps grinding sown the pads and rotors.
Should a replaced (new) assembly be bad this quickly. I am told it needs to be replaced now 8/2017 (two years old).
Can someone explain the relationship between the master cylinder and the broken brake line to a novice. thanks

When you say actuator, I think you're referring to the ABS pump?

I would say no. My experience with ABS pumps is through my BMW. BMW refers to it as the ABS/DSC hydro pump, and it has known issues to include BMW bikes.

I removed it from my vehicle, sent it out for repair (with 5 yr. warranty @ $249), and reinstalled it. This required not only a normal brake flush to get air out of the system, but using the computer to pulse all ABS channels, and then flushing again. With BMW, it's a known issue, but I am surprised it happens with Lexus. Normally, this is a part that imho should last the life of the vehicle....if this work were performed by a dealership, I'd speak with them and see what they can do under goodwill....

please note this was a dealer install and billed as new. I would think they did the correct/required computerized flushing and bleeding so that raises my concern as to how a 2 year old part such as this can do bad this quickly.

Grinding down the pads? That's usually a sign of a stuck caliper. Go for a 15-20 mile drive and then feel the temperature of the wheels. The fronts will naturally be warmer than the rears, but any individual wheel shouldn't be significantly hotter than any other. Bend over and sniff, as well. Hot brakes have an odor to them.

Chip H.

Caliper was stuck; smelled like it was burning. Has been changed.