Hydraulics, disc and drum brakes, ABS, parking brakes and brake diagnosis.
40 cards · basic cards · AI-written, checked twice. Edit anything.
- What does Pascal's Law state in the context of brake hydraulics?
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Pressure applied to a confined fluid is transmitted equally in all directions.- What is the primary purpose of brake fluid in a hydraulic brake system?
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To transmit force from the brake pedal to the brake components without compressing.- What are the two main DOT specifications for brake fluid, and which boils first?
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DOT 3 and DOT 4; DOT 3 has a lower dry boiling point (approximately 205 degC vs. 230 degC).- What does a proportioning valve do in a brake system?
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It reduces pressure to the rear brakes to prevent rear wheel lockup during hard braking.- What is the main component that creates hydraulic pressure in the brake system?
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The master cylinder, activated by brake pedal pressure.- Describe the two main types of disc brake calipers.
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Fixed calipers have pistons on both sides of the rotor; floating calipers have one or two pistons on one side only.- What is the purpose of a rotor in a disc brake system?
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To dissipate heat and provide a friction surface for the brake pads.- How much run-out is typically acceptable on a brake rotor?
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Generally 0.002 to 0.005 inch (0.05 to 0.13 mm) depending on manufacturer specs.- What is a brake pad wear indicator?
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A metal tab that contacts the rotor and creates a squealing noise when pads are worn to replacement thickness.- What are the primary components of a drum brake assembly?
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Brake shoes, wheel cylinders, backing plate, springs, and hardware.- What is the function of the wheel cylinder in a drum brake?
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To convert hydraulic pressure into mechanical force that pushes the brake shoes outward against the drum.- How are drum brake shoes typically adjusted on a self-adjusting brake system?
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Automatically during reverse braking, when the shoes move rearward and the adjuster mechanism takes up slack.- What is the purpose of the return springs in a drum brake?
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To pull the brake shoes away from the drum when hydraulic pressure is released.- What does ABS (Anti-lock Braking System) prevent?
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It prevents wheel lockup during hard braking by rapidly releasing and reapplying brake pressure.- What is the function of an ABS wheel speed sensor?
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To monitor the rotational speed of each wheel and send signals to the ABS control module.
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