On a vacuum-boosted system, all of the following can cause poor power-assist unit operation EXCEPT:
A)excessive manifold vacuum.
B)leaking or collapsed vacuum lines.
C)punctured diaphragm.
D)leaky piston seals.

Question

Quizplus · Accepted Answer

Excessive manifold vacuum would actually improve power-assist unit operation on a vacuum-boosted system. Leaking or collapsed vacuum lines, punctured diaphragm, and leaky piston seals can all cause poor power-assist unit operation.

On a Vacuum-Boosted System, All of the Following Can Cause