Possible reasons for automatic transmission kicking when braking:
1. Transmission fluid level is low: Check the transmission fluid level and add if necessary.
2. Solenoid problems: Solenoids control gear shifting. A faulty solenoid can cause kicking when braking.
3. Dirty Transmission Filter: A clogged filter causes restricted fluid flow and can cause shifting problems.
4. Faulty clutch: The clutch locks up the torque converter, resulting in smoother gear shifting. A faulty clutch can cause kicking when braking.
5. Worn friction discs: These discs provide traction between gears. Wear can lead to slipping and kicking.
6. Damaged torque converter: The torque converter converts torque from the engine into motion for the wheels. Damage to the torque converter can cause kicking when shifting gears.
7. Problems with Speed Sensors: These sensors provide information about wheel and engine speed. A faulty sensor can disrupt the transmission, causing it to kick.
8. Problems with the electronic control unit (ECU): The ECU controls the transmission. A faulty ECU may cause the gears to shift incorrectly.
9. Mechanical problems: These include worn gears, damaged bearings or a cracked transmission housing. These problems can lead to shifting kicks.
Recommendations for elimination:
* Check the fluid level in the gearbox.
* Replace dirty transmission filter.
* Diagnose and replace faulty solenoids or clutches.
* Check the friction discs for wear.
* Inspect and repair or replace damaged torque converter.
* Check and replace faulty speed sensors.
* Scan and reprogram the ECU if necessary.
* Carry out a mechanical check of the transmission and repair any damage found.
If you are unable to resolve the problem yourself, have it diagnosed and repaired by a qualified mechanic.