I replaced the battery and now my Brake, ABS, VSC Trac and VSC off nights are on with a warning sound constantly emitting and the power assist of the brake pedal does not work. It is a hard push but the brakes are there with good bad. All was good until the battery died. No warning just one day died and the vehicle would not start back up without chaining the battery. Is this a brake booster issue or any thoughts before I put un-necessary $ into it.I have checked all the grounds and double checked their connections and no issues.

If it matters this is on 2008 GX470, 165k

Any help or direction would be greatly appreciated. I thought it could be the Brake/Booster/Master Cylinder unit.

Try resetting the systems - disconnect the negative terminal for about 30-40 seconds, then reconnect it with a minimum of sparks.

If this still doesn't help, then the brake booster is a good possibility. Get the vehicle towed to your mechanic (don't attempt to drive it). Typical repair costs for the pump alone are in the $1700 range (parts are $900+, then labor). For the pump + master cylinder (includes the ABS valve block), the parts cost is $2700. If you've gotten your routine service done there, ask for some goodwill consideration.

https://www.lexussouthatlantaparts.c...rimLevel=19100

Chip H.