CDL Test Questions and Answers. Reduced temperatures lower the risk of loss of stopping power—brake fade—while also extending lining life. C. Road debris. When brake fluid fade occurs, pressing down on the brake pedal may result in a soft or "spongy" feeling. This also reduces braking power. c. Clean with approved cleaner and reuse d. Repair leak and replace brake linings. Technician A believes it's a defective proportioning valve issue. Brake fade is not a mechanical fault. Brake fade is caused by a buildup of heat in the braking surfaces and the subsequent changes and reactions in the brake system components and can be experienced with both drum brakes and disc brakes. Binding pedal linkage would lead to a hard pedal, which is also true for a dented brake line. A. Brake fade. Some drivers, especially new ones, have a tendency to "ride the brakes." This can also cause brake fade. A. Scratcher type B. Excessive heat caused by overuse of the service brakes can cause. A. Once has to ensure that their breaks are working before they hit the road. This overheating causes them to fade, making them less effective at slowing the vehicle. When brake fade happens, it results in unexpected or inconsistent braking — typically increasing stopping distance and the likelihood of an accident. Once the vehicle is in the proper low gear, the following is the proper braking technique: Apply the brakes just hard enough to feel a definite slowdown. Depending on the design, brake pads can stand temperatures up to 700°F - 1,200°F. To learn more about Roehl's paid CDL training, view our Get Your CDL page or apply now. It is used for slowing or stopping a moving vehicle, wheel, axle, or to prevent its motion, most often accomplished by means of friction. There are a total of 25 multiple choice questions on the air brakes exam, and you must score 80% (20 out of 25) to pass the exam. We have complied 100 questions you will find on the air brakes exam. Water. Car. 6. Furthermore, brake fade can be a factor in brake failure that comprises a friction braking system. Technician B says that disc brakes dissipate heat faster than drum brakes. When your speed has increased to . Which of the following can cause brakes to fade or fail? An overheated radiator is the most common cause of a vehicle fire. ️An operator would describe fade as the need to push the pedal harder to get the same braking effectiveness. If you notice smoking or an acrid burning smell coming from one wheel, you might want to check on the brakes. Take this quiz on breaks and breaking system and see how well you know about them as a whole. Report an issue. There are 3 types of brake fade. Glazing is more a problem with drum brake systems than disc systems because pads get more ventilation. release the parking brake, move the vehicle forward slowly, and apply . Additionally, as the brakes get hotter, they can catch on fire and/or catch the corresponding tires on fire. Mechanical Foundation System -Components (such as discs and pads or drums and shoes) that creates the friction required to stop the vehicle. To drive a vehicle with air brakes, you must pass the air brake component of the Tennessee CDL knowledge test. 2011 Honda FN2. That overheated water boils into steam, which reduces the effectiveness of your brakes. Which of the following could cause an extremely hard brake pedal? I'm ready for paid, on-the-job training to get my CDL. question. When the brake shoe friction material is worn to the point that the metal brake shoe backing contacts the drum, a scraping/ grinding noise will be heard each time the brakes are applied. None of the above Question 5 Who is correct? Questions and Answers. There are a total of 25 multiple choice questions on the air brakes exam, and you must score 80% (20 out of 25) to pass the exam. push the parking brake control knob in. C. Under-inflated or flat tires will NOT cause a vehicle fire. Going too slow. Correct answer: Weak hydraulic hose. - air in the system - excessively worn brake pads - use of the wrong fluid - a leaking diaphragm in the vacuum power booster Fade Dissipation of heat from the brake components is necessary to prevent brake: - chatter - fade - grab - shudder A only 6. Glazed brake pads result from excessive heat. Tech A says that disc brakes are used on the front of most vehicles built since the early 1970s and on the rear wheels of many vehicles. . The air brakes test covers the air brake system in detail, including appropriate air loss, brake lag, system components, and more. 7) Burning Smell. Going too slow. Which of the following can cause brake fade? Damaged brake pads from overuse and overheating. The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. Get paid to get your CDL in our truck driving job! push the brake pedal three times. BF can be due to a couple of things, degraded fluid that has taken in moisture and the heat transfer from the discs boils the fluid pushing the pistons onto the pads and that results in a spongy pedal, poor quality/unsuitable pads that are overused at the track, or long downhill descents. When your speed has been reduced to approximately 5 mph below your "safe" speed, release the brakes. Brakes are one of a number of mechanisms and forces in a car that slow it down. When you apply the brakes and heat is transferred to the brake fluid, eventually the fluid will boil if the brakes aren't allowed to cool. All of the following can turn on the red brake warning light, EXCEPT: the parking . The air brakes test covers the air brake system in detail, including appropriate air loss, brake lag, system components, and more. What factors can cause brakes to fade or fail? This questions appears in the following tests: California Class A Knowledge Test Following are some of the possible causes and remedies for brake failure: Sr. No. 6. The others include air resistance, rolling resistance, engine compression and gravity (if travelling uphill). a. Brake fade in these cases will still, usually, have a firm pedal but the conversion of momentum into heat cannot effectively happen so the car does not slow up . both. These effects on brake fade are discussed in the following section. B. Anti-lock braking system operation. Replace the brake linings b. Wash in hot, soapy water and dry. Tags: Question 10. There are a total of 25 multiple choice questions on the air brakes exam, and you must score 80% (20 out of 25) to pass the exam. Which of the following is a type of disc brake pad wear indicator? 17. Friction Fade Friction fade is the most common type and can be called "pad fade." It is caused by the pad material starting to melt. Brakes kept in good condition will rarely fail, but you should know which . If you continually depress or ride your brake pedal, not only will you drain your air reservoirs, you will also overheat your brake drums. all of the above. Brake fade caused by water can occur _____. A first likely cause of brake failure is that the brakes have been overused on a downgrade, causing them to fade. On a car with a drum/disc system, the front brakes lock up on light pedal application. This heat can be caused by a dragging brake unit. The weak hydraulic brake hose causes a spongy pedal. Once the vehicle is in the proper low gear, the following is the proper braking technique: Apply the brakes just hard enough to feel a definite slowdown. Technician B says that friction brakes can fade due to overheating of the brake fluid. If the low air pressure warning light comes on, you should: continue to drive normally. The following factors can cause brakes to fade or fail: Not regularly checking brakes for signs of wear or damage. When your speed has been reduced to approximately 5 mph . Brake fade or braking system fade is the degradation or complete loss in stopping power of vehicle's braking system. An effective braking system and driver ability behind the wheel are most important to ensure swift and safe braking. 1. Relying solely on the brakes for long periods of time will cause the brakes to overheat, and this causes brake fade - a partial or complete . Oil, grease, dirt, dust, and debris in the braking system. Which technician is correct? If going downhill it's better to downshift as opposed to riding . The Master Cylinder is a vital component found in modern vehicle braking systems, as it is the main pump that sends pressurized brake fluid through the brake lines, allowing the brake calipers to squeeze . Glazed shoes or pads cause brake fade resulting in a loss of friction and reduced braking performance. Under which conditions are front wheel brakes good? This may be caused by incorrect brake adjustment, not enough reliance on engine braking, excessive use of the service brakes, another mechanical factor, or human error. We have complied 100 questions you will find on the air brakes exam. turn off the engine, release the parking brake and time the air pressure drop. a. Boiling the brake fluid. 2. use engine braking. Steering wheel shimmy. Technician A says that water-soaked brake shoes will cause brake fade. a. A brake is a mechanical device that inhibits motion by absorbing energy from a moving system. Brake fade is one of the leading cause of road crash here in the country especially with truck . 11,000 feet, driving Pikes Peak highway that tops out at 14,110 feet, or Mount Evans Road, that tops out at 14,130 feet can easily cause brake fade, by producing a significant drop in the brake fluid boiling point. The goal of brake and friction design, then, is to maintain the lowest possible braking temperatures. D. Unlock all answers Please join to get access. Know Everything about Brakes in this Automobile Quiz. What factors can cause brakes to fade or fail? Which of the following statements about causes of vehicle fires is true? Sometimes, however, the brake hardware might be causing a . #4. We have complied 100 questions you will find on the air brakes exam. It can happen if you ride the brakes down a long hill, while hauling a heavy load, or while racing. . Most hydraulic brake failures occur for one of two reasons. 25 January 2015. To drive a vehicle with air brakes, you must pass the air brake component of the Oklahoma CDL knowledge test. Technician B says that disc brakes dissipate heat faster than drum brakes. Which of the following conditions can cause brake pedal fade? B. Which of the following can cause brake pedal pulsation? D. All of the above. push the parking brake control knob in. Answer A is correct. turn off the engine, release the parking brake and time the air pressure drop. Brake fluid fade occurs because your brake fluid (being hydrophilic) absorbs moisture. Overheating, low air pressure or water in the air tanks. . False 8. . Tech B says that a disc . The pressure can continue to build and the hose might expand, but not release the pressure to the brake units. There are a total of 25 multiple choice questions on the air brakes exam, and you must score 80% (20 out of 25) to pass the exam. a. We have complied 100 questions you will find on the air brakes exam. 5. A brake surging feeling. Rotors that are too thin cannot handle as much heat and will experience brake fade. Since brake fade occurs from overheating, it's usually temporary and . There are a total of 25 multiple choice questions on the air brakes exam, and you must score 80% (20 out of 25) to pass the exam. The moisture-contaminated brake fluid in your brake line and brake hose network is likely to boil and produce air bubbles when exposed to the heat generated by heavy braking. On an incline, use your transmission to slow the bus. B. Brakes are one of a number of mechanisms and forces in a car that slow it down. Brake fade and failure are usually due to incorrect use of the brakes that causes excess heat. Pump non-ABS brakes. The air brakes test covers the air brake system in detail, including appropriate air loss, brake lag, system components, and more. answer. A. Rotors with excessive lateral run out. Binding pedal linkage would lead to a hard pedal, which is also true for a dented brake line. We have complied 100 questions you will find on the air brakes exam. release the parking brake, move the vehicle forward slowly, and apply . Relying solely on the brakes for long periods of time will cause the brakes to overheat, and this causes brake fade - a partial or complete . Overheating, low air pressure or water in the air tanks. Correct answer: Weak hydraulic hose. The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. 4-wheel disc brakes on a vehicle are causing brake squeal. Leakage past the master cylinder cups d. Air in the hydraulic systemThe greatest drawback of drum brakes is that they are susceptible to fade. The other three answers can lead to a low brake pedal. place the parking brake control knob in Neutral. The air brakes test covers the air brake system in detail, including appropriate air loss, brake lag, system components, and more. Brake drum machined beyond its limit c. Leakage past the master cylinder cups d. Air in the hydraulic system B. The air brakes test covers the air brake system in detail, including appropriate air loss, brake lag, system components, and more. All of the following can turn on the red brake warning light, EXCEPT: the parking . When driving through water puddles or during a severe rainstorm . The weak hydraulic brake hose causes a spongy pedal. Use this free Air Brakes commercial drivers license practice test to prepare yourself to get your CLP (commercial learner's permit). Technician B says a defective master cylinder can cause the brake pedal to slowly sink to the floor when depressed. It's a temporary loss of function in the braking system. Technician A says that water-soaked brake shoes will cause brake fade. The pressure can continue to build and the hose might expand, but not release the pressure to the brake units. To avoid brake fade while slowing down. D. Poor trailer ventilation can cause cargo to catch . . both. The TN CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The driver meets resistance when pushing the brake pedal, but little to no deceleration happens. A typical air brake system is fully charged at. 10. ️Brake fade is a problem that can be described as the inability of the brakes to maintain their effectiveness. When the drum is overheated, it separates and expands away from the brake shoes. 30 seconds. Today's Question: cdl/brake-fade-is-a-result-of . None: Good weather only: Wet or icy conditions only: Tech B says that a disc brake operates by squeezing brake pads on both sides of a rotor or disc that is attached to the wheel. Loss of stopping power, or fade, can be caused by friction fade, mechanical fade, or fluid fade. Excessive brake disc rotor thickness variation will cause: A. Brake fading is commonly caused by the overheating of a brake pad and can happen on cars, trucks, SUVs, and motorcycles. stop immediately. Who is correct? The brakes may fail due to a loss of hydraulic pressure or due to overuse on long hills, causing the brakes to fade. That ultimately includes almost every vehicle per se, such as cars, trucks, motorcycles, and bikes. SURVEY. This is characterized by a firm brake pedal but ineffective braking. Questions and Answers. CDL Test Questions and Answers. All of the following are types of brake fade except _____. The brake pedal is soft and spongy. To control your speed on a downgrade, you should: use controlled braking. The OK CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). Mechanical Fade . Tech B says that when the brake pedal is depressed, a push rod transfers the force through a brake booster to a hydraulic master cylinder. At first the pedal will feel spongy as air bubbles start to form in the fluid and you'll need to push it down further to achieve the same braking power. It's important to remember . push the brake pedal three times. The rear brake linings are soaked with axle grease but still have a lot of lining left on them. (This brake application should last about 3 seconds.) Correct answer B-Having a seized caliper piston leads to a high pedal. Too much heat on the brake drum can cause either it or the tire it is controlling to catch on fire. Seized wheel cylinder piston b. Brake Fade. A drum brake inspection is being attempted but the technician is having difficulty removing the brake drums. . Tech A says that disc brakes are used on the front of most vehicles built since the early 1970s and on the rear wheels of many vehicles. Trouble Cause Remedy 1. During normal driving, spring brakes are usually held back by . This will cause the overworked brakes to become much hotter than they should be and may eventually lead to brake fade. Water in the braking system. Here are some of the symptoms associated with a faulty brake drum: Scraping or Grinding Noise. Brake drum machined beyond its limitc. There are a total of 25 multiple choice questions on the air brakes exam, and you must score 80% (20 out of 25) to pass the exam. fully apply the brakes. What factors can cause brakes to fade or fail? Damaged or faulty brake hoses. When a brake caliper gets stuck in a clamped position, it generates an excessive amount of heat. All of the following are possible causes except: (a) Incorrect parking brake adjustment (b) Excessive shoe-to-drum clearance (c) Wear ridge on the drum (d) Parking brake not fully released (0.5 mark) True B. 6.Which of the following conditions can cause brake pedal fade? Typically, the three most common problems related to brake pedal sink are caused by the master cylinder, a brake fluid leak, or ABS unit leak. Technician B says that friction brakes can fade due to overheating of the brake fluid. The primary reason for brake fade in a good well maintained car is the heat build up which can adversely affect the friction and even cause warping or distortion of the brake components. When the good brakes fade, the only brakes available to stop the truck will be the deficient ones. We have complied 100 questions you will find on the air brakes exam. Bulk drum temperatures can reach up to 600°F, and bulk lining temperatures can approach 500-550°F. Rotor fade. Seized wheel cylinder piston b. Related post: Keronite Tech: Aluminum With Ceramic Coatings This is due to sustained and repetitive application of the brakes which results into deterioration of both drum and disc brakes. This heat will melt the brake pads and heat up one wheel more than the others. The amount of friction between two moving faces in contact with each other is expressed as a ratio and is called: answer choices fraction the coefficient of friction the coefficient of heat. This questions appears in the following tests: Connecticut Air . Excessive use of the service brakes may result in overheating, which can lead to. a . Which of the following conditions can cause brake pedal fade? C. . ️Common types of brake fade are heat, water, mechanical, and chemical fade as well as glazing of lining. These locations also put extreme demands on . pull the parking brake control knob out. C. Both A and B D. None of the above 9. Hydraulic system -Components (such as the brake lines and master cylinder) that transfers power from the brake pedals to either disc or drum brakes. Tech A says that when the brake pedal is depressed, a push rod creates the hydraulic pressure in the disc brake system. First, gear down before you get to an incline or situation where you need to stop. . Brake Fluid Fade: Brake fluid fade can happen when water in the vehicle's brake fluid overheats from all the friction. Excessive use of the service brakes results in overheating and leads to brake fade. answer choices heat water hydraulic All of the above Question 4 30 seconds Q. 4. Use the retarder if you have one. Brake fade. they can become too hot. place the parking brake control knob in Neutral. Today's Question: cdl/brake-fade-is-a-result-of. What causes brake fade? The second likely cause is that there has been a loss of hydraulic pressure in the braking system. Excessive use of the service brakes: not relying enough on engine braking: Brakes being out of adjustment: All of the above: 7. D. All of the above. Worn brake pads, air bubbles in the brake lines, low fluid level in the reservoir. Brake drum machined beyond its limit c. Leakage past the master cylinder cups d. Air in the hydraulic system B The rear brake linings are soaked with axle grease but still have a lot of lining left on them. Seized wheel cylinder piston b. And it can happen with both the drum brake and the disc brake system. 1. Which of the following can cause brakes to fail or fade? Brake fade. The others include air resistance, rolling resistance, engine compression and gravity (if travelling uphill). Using brakes parts past when they should be changed. To check that spring brakes come on automatically, the first thing to do is to: continue to step on and off the brake pedal until the air pressure falls to the manufacturer's specification. Carrying a properly charged and rated fire extinguisher will help to prevent a fire. 6. What factors can cause brakes to fade or fail? Q. To check that spring brakes come on automatically, the first thing to do is to: continue to step on and off the brake pedal until the air pressure falls to the manufacturer's specification. The air brakes test covers the air brake system in detail, including appropriate air loss, brake lag, system components, and more. pull the parking brake control knob out.
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