Single-Circuit Brake Booster (27.7) Functional Diagram

TM 5-2420-224-20-1

AIR SYSTEM (CONT)

Single-Circuit Brake Booster (27.7)

Function Diagram

Important Information

T he tr avel of the f oot brak e pedal m us t be s et to ens ur e that the m inim um pus h r od tr avel is

al wa ys ac hie ved, s o tha t the tr ailer br ak e line c an be f ull y ac tuated in t he c as e of dam age in

the pneum atic br ak e s ys t em . Between the pis t on of the h ydr aulic m aster br ak e c ylind er and

the pis ton r od of the s ingle- c ham ber br ak e boos ter , ther e m us t be a min imu m clearan ce o f

1 m m i n t h e r e l e a s e d p o s i t i o n t o e n s u r e t h a t t h e e q u a l i zi n g h o l e i n t h e m a s t e r c yl i n d e r i s c l e a r .

U n d e r n o c i r c um s t a n c es m us t t h e s t r ok e of t h e m a s t e r c yl i n d e r b e s h o r t e r t h a n t h a t o f t h e

b r ak e b o o s t e r , o t h e r wis e t h e i n n e r p a r t s o f t h e m as t e r br ak e c yl i n d er w o u l d b e d am a g e d .

W hen the br ak e is c or r ec tl y adj us ted, the pis ton s tr ok e is appr ox . 1/3 of the total s pec if ied

s tr ok e.

1-16.16

Change 1