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ASE Brakes Practice Test
A5 Brakes
ASE Brakes
A5 Brakes Practice Test
Question 1 of 3
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The brakes of a four wheel disc brake system are self-applying and locking up after only a few miles of travel. Which of the following is most likely the cause of this condition?
A
Low intake manifold vacuum.
B
A blocked master cylinder replenishing port.
C
Worn master cylinder cup seals.
D
A blocked master cylinder vent port.
Blocking the vent port can lead to pressure buildup and brake lockup. The vent or compensation port allows for the expansion of brake fluid. Brake fluid expands as brake fluid temperature rises from normal braking. If the port is blocked, excessive pressure will cause the brake units to self-apply.
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