Possible causes of automatic transmission kicking when braking:
Mechanical faults:
* Wear of friction clutches
* Damage to the torque converter
* Valve block clogged
* Malfunction of solenoids
Software faults:
* Incorrect transmission calibrations
* Malfunctions of the automatic transmission control unit
Lack of maintenance:
*Low transmission fluid level
* Worn or dirty transmission fluid
* Clogged automatic transmission filter
Other factors:
* Worn spark plugs
*Low battery voltage
*Mass air flow problems
*Transmission shaft faults
* Malfunction of the crankshaft position sensor
Possible solutions:
*Checking the transmission fluid level and condition: If the fluid level is low or the fluid is dirty, replace the fluid and filter.
* Inspect and replace worn components: Remove and inspect the clutches, torque converter, valve body and solenoids for wear or damage. Replace faulty components if necessary.
* Software Update: Take the vehicle to your dealer or qualified mechanic to have the automatic transmission control unit software updated.
* Troubleshoot electrical problems: Check the battery, spark plugs and other electrical components for problems and replace them if necessary.
* Diagnostics using a scanner: Connect a diagnostic scanner to the vehicle to read trouble codes that indicate the cause of the kicking.
*Consult a mechanic: If you are unable to determine or fix the problem yourself, contact an experienced mechanic for more detailed diagnosis and repair.