2 black exhaust gas relesed from deisel engine is the indication of
A lean mixture
B oil inter in the composition chamber
C over rich mixture
D worn piston ring
3 why failures of slow response or excessive pedal travel when braking system or component fluid or gas leakage
A air in the brake lines
B plugged canister purge vacuum bose
C brake line damage
D old or low brake fluid
E all
The answer to question 2 is C - over rich mixture.
The answer to question 3 is E - all of the above. All of the listed factors can result in failures of slow response or excessive pedal travel in a braking system.