PARKING BRAKE NOT RELEASED PROPERLY; BRAKE ENGAGES DURING TAXI.

Narrative

AFTER USING THE PARKING BRAKE WHILE PARKED ON THE RAMP; WE TAXIED OUT FOR TKOF. ON THE WAY TO THE RWY; THE L BRAKE ENGAGED ITSELF. NO DAMAGE EXCEPT A BROKEN BRAKE PAD OCCURRED. I FIND OUT LATER THAT THE CORRECT WAY TO RELEASE THE PARKING BRAKE IS BY TAPPING THE BRAKES ON THE PLT'S SIDE. I HAD TAPPED THE BRAKES ON MY SIDE; THE COPLT'S SIDE. THIS PROC IS NOT IN THE C152 PLT OPERATING HANDBOOK. CESSNA NEEDS TO PUT THIS PROC IN THEIR MANUAL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES HIS OWN INSTRUCTION WAS NOT TO USE THE PARKING BRAKE AND THAT IS HOW HE TEACHES MOST OF HIS STUDENTS. THIS PARTICULAR STUDENT; HOWEVER; CHOSE TO USE THE PARKING BRAKE AND RPTR THOUGHT THAT HE WAS RELEASING IT BY STEPPING ON THE TOE BRAKES. HIS BOSS TAUGHT HIM; AFTER THE INCIDENT; THE PROPER WAY TO USE THE PARKING BRAKE IS TO PULL OUT THE KNOB; STEP ON THE TOE BRAKES AND RELEASE THE KNOB WHICH RETURNS TO THE ORIGINAL POS. TO DISENGAGE THE PARKING BRAKE ONE MUST TOUCH THE TOE BRAKES ON THE PLT'S SIDE OF THE ACFT. APPARENTLY ONE CANNOT RELEASE THE PARKING BRAKE FROM THE R SIDE. RPTR WAS TOLD THAT THE BRAKE WAS CLOSE TO LOCKING WHICH WOULD HAVE CARTWHEELED THE ACFT HAD THEY BEEN ON TKOF ROLL. VERY LUCKY. ANALYST SPOKE TO 3 INSTRUCTORS WHO ALL INDICATED THAT THEY TEACH STUDENTS NOT TO USE THE PARKING BRAKE; BUT TO USE TOE BRAKES ONLY ON THE CESSNA 152. ADDITIONAL INQUIRY USING MAINT MANUALS INDICATED NO PROCS GIVEN FOR PROPER USE OF THE PARKING BRAKE SYS. PROC INDICATED BY OUR INVESTIGATOR IS TO STEP ON THE BRAKE; PULL THE LEVER OUT; RELEASE THE BRAKE AND THEN RELEASE THE LEVER. TO DISENGAGE ONE SHOULD STEP ON THE BRAKE; PULL OUT THE LEVER AND RELEASE BOTH. SOMEWHERE THIS SHOULD BE SPELLED OUT TO PLTS.