Possible reasons for the automatic transmission jolting when braking:
1. Transmission fluid problems:
*Low fluid level
*Dirty or old fluid
* Wrong fluid type
2. Problems with the valve body:
* Worn or dirty valves
* Faulty solenoids
3. Problems with the torque converter:
* Worn or burst friction discs
* Faulty torque converter housing
4. Problems with electronics:
*Faulty throttle position sensor
* Faulty speed sensor
* Faulty engine control unit (ECU)
5. Other problems:
* Worn or burst engine or transmission mounts
* Problems with drive shafts
* Defective brake hose or caliper
Possible solutions:
1. Check and, if necessary, replace the transmission fluid:
*Make sure the fluid level is correct
*Use the correct type of fluid recommended by the manufacturer
2. Clean or replace the valve body:
*If the fluid is dirty, the valve body may need to be flushed or replaced
* Replace faulty valves or solenoids
3. Replace the torque converter:
* If the friction discs are worn or burst, the torque converter must be replaced
4. Check and replace electronics if necessary:
* Replace faulty sensors or ECU
5. Fix other problems:
* Replace worn engine or transmission mounts
*Service drive shafts
* Replace faulty brake hose or caliper
Note: Automatic transmission jolting when braking may be a sign of a serious problem. If you notice these symptoms, it is important to contact a qualified mechanic immediately for diagnosis and repair. Delay may result in further damage and costly repairs.