In this manner, the brake booster 1 functions as {HEAD ~ an automatic brake} without operating {TAIL ~ a brake pedal} 
without operating
In this manner , the brake booster 1 functions as { HEAD ~ an automatic brake } without operating { TAIL ~ a brake pedal }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL