TMC MCI mc-9 - Page 33

Stoppi ng Engine at Rear
To stop engine at rear, place "ENG. RUN" switch to "ENG. OFF"
position.
IM PO RT ANT
In emergency only , if " STOP" switch does not st op engine , push
1n " EM ER GENCY ST OP " switch lo release air choke valve cam .
Reset emergency slop afte r engine has slopped , as explained under
" ENGI NE OPERATION."
CAUTI ON :
If n
ecess a ry to work on engine without engine running , place
" REMO TE CO NTROL" and "RUN" switches in "O FF " positions . This
breaks circuit lo front and rear st arter and preven ts. occidental
sta r ling of engine .
Use of Service Brakes
The coach is equipped with air - operated brakes which ore app lied
using
the loot pedal to tl:re left of the accelerator pedal. The amount of
foot
pressure o pp lied to the pedal determines the extent of broke
application.
The bes t brok ing action is obtained by mo king the initial op plication
gradually to obtain the degree of broking required, then gradually
red ucing foot pressure os the speed of the coach is reduced , so that only
slight
pressure remains in the broke chambers at the end of the stop.
Stop lights on the rear of t he coach ore automatically o ppl ied when
the broke pedal is depressed . A tell-t ole light on t he dash shows when
stop lights ore oClivoted.
31
IMPORTANT
"
Fa n ning " or " Pump i ng " the brake pedal is not recommended .
This
practice does not increase the effectiveness of the br oke
system , but wastes air and causes unnecessary wear on brake
ports . Broke chamber and line pressure is not increased, instead
reservoir and line pr~sure is reduced .
Before brakes con develop their full effectiveness, coach air
system pressure must be at l east 100 I bs. ( 690 kPo). Observe t he air
pressure indicated on the air pressure gauge at frequent intervals
during operation. If the " LOW AIR" tell-tale light flashes and
buzzer sounds , stop vehicle immediately and determine cause
before proceeding .
Parking & Emergency Brakes
The coach is equipped w, th air-operated parking and emergency
bra kes. The cont rol valve for park ing and emergency brakes is located
to the right of the dr i ver 's sea t on o bracket attached to the grab roil. A
h
inged cover over the valve is provided on later coaches to guard
against accidental rel ease of pork brakes . Operat i on of the sys t em is as
fo ll ows:
NORMAL OPERATION: The control val ve b utto n should be pushed in
allowing service brakes to operate nor mally.
LOSS OF AIR PRESSURE : A warning tell-tole light will flash and buzzer
will go on when air pre < ~e drops below 70-75 lbs. (483-517 kPo).
Couse of pressure loss should be corrected before further opera tion.
In compliance with Fede ra l and State regulations, all buses
manufactured ofter September 1976 ore equipped with on emergency
modulated broke system.