C152 INSTRUCTOR AND STUDENT LNDG AT ARB HAVE RWY EXCURSION.

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AFTER A SLIGHTLY LONGER LNDG ON ARB RWY 24 THAN DESIRED; INSTRUCTOR ADVISED STUDENT TO LET THE AIRPLANE ROLL TO THE END; AS THE AIRPLANE WAS GOING TOO FAST TO SAFELY MAKE THE MID-RWY R TXWY TURNOFF DESIGNATED A2. THE STUDENT DID NOT ACKNOWLEDGE THIS AND PROCEEDED TO APPLY UNEQUAL BRAKING ADDING TOO MUCH L BRAKE. THIS CAUSED THE AIRPLANE TO START VEERING TO THE L OF RWY CTRLINE. INSTRUCTOR STATED 'MY AIRPLANE' AND IMMEDIATELY INITIATED R RUDDER PRESSURE AND R BRAKE IN AN ATTEMPT TO STOP AIRPLANE VEERING TO THE L AND REMAIN ON THE RWY. INSTRUCTOR THEN STATED 'OFF THE BRAKES.' STUDENT DID NOT RELEASE L BRAKE UNTIL APPROX 2-3 SECONDS LATER AND STUDENT STATED 'YOUR AIRPLANE' TO THE INSTRUCTOR AT WHICH POINT THE STUDENT RELEASED ALL BRAKES AND FLT CTLS. AT THIS POINT THE AIRPLANE WAS AIMING STRAIGHT AT A RWY LIGHT APPROX 15-25 DEGS OFF RWY CTRLINE TRAVELING AT APPROX 20-25 KTS. INSTRUCTOR DETERMINED THAT IF A FURTHER ATTEMPT WAS MADE TO STAY ON THE RWY AT THIS POINT; THE AIRPLANE WOULD STILL GO OFF THE RWY AND MOST CERTAINLY HIT THE RWY LIGHT. TO AVERT; THIS INSTRUCTOR STARTED APPLYING L RUDDER PRESSURE AND USED DIFFERENTIAL BRAKING; APPLYING MORE L BRAKE THAN THE R BRAKE TO BOTH SLOW THE AIRPLANE AND TO HELP STEER THE AIRPLANE FARTHER TO THE L TO AVOID THE RWY LIGHT. AIRPLANE WENT OFF THE L SIDE OF THE RWY BTWN RWY LIGHTS INTO AN AREA OF GRASS SURROUNDING THE RWY STRAIGHTENED OUT THEN PARALLELED THE RWY WHILE SLOWING STRAIGHT AHEAD AND THEN PROCEEDED BACK ONTO THE RWY IN A CTLED MANNER. AIRPLANE DID NOT SUFFER ANY DAMAGE NOR DID ANY RWY LIGHTS. THE LCL TWR CTLR THEN ASKED IF WE HAD HIT ANYTHING AND IF WE WERE IN NEED OF ASSISTANCE. INSTRUCTOR STATED 'WE MANAGED TO MISS EVERYTHING' AND THAT WE DID NOT NEED ASSISTANCE. AIRPLANE TAXIED TO THE END OF RWY 24 AND TURNED R AT THE TXWY A3 INTXN CLRING THE RWY WITHOUT FURTHER INCIDENT. UPON QUESTIONING THE STUDENT; I DETERMINED THAT THE PREVIOUS INSTRUCTORS HAD NOT EXPLAINED THE NOSEWHEEL STEERING SYS OR THE BRAKE SYS ADEQUATELY TO THIS STUDENT. SHE ALSO STATED THAT PREVIOUS INSTRUCTORS TOGETHER DID NOT TELL HER HOW TO DO THINGS AS MUCH AS HER ASSIGNED INSTRUCTOR EVEN IF THE FIRST 3 FLTS WERE PUT TOGETHER. I FEEL THE INADEQUATE EXPLANATION OF THE BRAKING AND NOSEWHEEL STEERING SYS WAS A MAJOR FACTOR. CONTRIBUTING TO THIS I BELIEVE WAS THE STUDENT'S EXPERIENCE WITH PREVIOUS INSTRUCTORS WHO HAD ALL MADE SURE THE AIRPLANE MADE THE MID FIELD A2 TXWY R TURNOFF. AS A FURTHER FACTOR; IT SEEMS THE STUDENT WAS NEEDING ADDITIONAL PRACTICE APPLYING L BRAKE; AS SHE WAS NOT ACCUSTOMED TO HAVING TO DO THIS IN EVERYDAY LIFE AND ALSO PROPER BRAKE APPLICATION TECHNIQUES. I ALSO FEEL THE IMPORTANCE OF BRAKING STRAIGHT AHEAD WHILE DECELERATING FROM A LNDG SHOULD BE STRESSED BEGINNING WITH THE FIRST FLT AND THAT A TURN ONTO A TXWY ONLY BE ATTEMPTED ONCE THE AIRPLANE HAS SLOWED DOWN TO A SAFE TAXI SPD. I BELIEVE THE ADDITION OF STRESSING BRAKING STRAIGHT AHEAD DURING AFTER LNDG DECELERATION TO NORMAL TAXI SPD SHOULD BE ADDED TO THE FAA'S AIRPLANE FLYING HANDBOOK INSTEAD OF THE CURRENT 'THE AIRPLANE SHOULD BE GRADUALLY SLOWED TO NORMAL TAXI SPD BEFORE TURNING' AS WELL AS ONLY TURNING OFF THE RWY AFTER THE AIRPLANE HAS ATTAINED A SAFE TAXI SPD FIRST.