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Les 15 questions en un coup d'œil

Tu préfères lire avant de jouer ? Toutes les questions de l'échantillon sont listées ci-dessous. Les réponses et les explications restent repliées tant que tu ne les ouvres pas.

1. 1. A dual, or split, master cylinder is used so that:

   • A. the pedal takes less effort to push
   • B. the rear brakes always get the same pressure as the front brakes
   • C. a leak in one circuit still leaves the other circuit able to stop the vehicle
   • D. the brake fluid never has to be replaced
   Voir la réponse et l'explication

   Réponse : C. a leak in one circuit still leaves the other circuit able to stop the vehicle

   A dual master cylinder has two pressure chambers feeding two separate circuits, split either front to rear or diagonally. Lose one circuit and the other still works, but only about half the braking is left, the pedal travels much farther before it does anything, and the stopping distance grows. A pressure differential switch senses the imbalance and turns on the brake warning lamp, so a warning lamp with a long pedal is a failed circuit to be found, never a top off job.

2. 2. Complete the sentence.

   Brake fluid meeting DOT 3 and DOT 4 is hygroscopic, which means it absorbs _____ from the air over time. That lowers the fluid's _____, so hard repeated braking can boil it and leave the pedal soft just when it is needed most.

   Options pour le trou 1 : moisture, heat, copper, oxygen

   Options pour le trou 2 : viscosity, color, boiling point, freezing point

   Voir la réponse et l'explication

   Réponse : moisture, boiling point

   Glycol based fluid pulls water vapor in through hoses, seals and the reservoir cap, and even a small percentage of water drops the boiling point sharply. Liquid fluid does not compress, but the vapor bubbles that form when it boils do, which is why fluid that was fine on flat roads can give a long soft pedal on a mountain descent. That is the whole reason manufacturers publish a fluid replacement interval by time rather than by mileage.

3. 3. Which of the following statements about brake fluid are true?

   Coche toutes les bonnes réponses.

   • A. DOT 3 and DOT 4 are glycol based and pull moisture out of the air
   • B. Water absorbed by the fluid raises its boiling point
   • C. DOT 5 is silicone based and must not be mixed with DOT 3 or DOT 4
   • D. Spilled glycol based fluid can damage painted surfaces
   • E. An opened container of brake fluid can sit uncapped on the bench with no effect on it
   Voir la réponse et l'explication

   Réponse : A. DOT 3 and DOT 4 are glycol based and pull moisture out of the air, C. DOT 5 is silicone based and must not be mixed with DOT 3 or DOT 4, D. Spilled glycol based fluid can damage painted surfaces

   DOT 3, DOT 4 and DOT 5.1 are glycol based and hygroscopic. DOT 5 is silicone, does not absorb water and is not compatible with the glycol fluids, so mixing them is a system contamination, not a top off. Water lowers the boiling point rather than raising it. Glycol fluid strips paint, so wipe spills immediately and flush with water. And an open container starts absorbing moisture right away, which is why you use fluid from a sealed container and cap what is left.

4. 4. A brake pedal feels soft and springy, and it firms up when the driver pumps it. This most often means:

   • A. air is trapped in the hydraulic system
   • B. the master cylinder seals are bypassing internally
   • C. the rotors have excessive lateral runout
   • D. the parking brake cable is seized
   Voir la réponse et l'explication

   Réponse : A. air is trapped in the hydraulic system

   Brake fluid does not compress, so a pedal that squashes has something in it that does, and that is air. Pumping compresses the trapped air enough to move fluid to the wheels, which is why the pedal firms up on the second and third push. Bleeding fixes the symptom, but find how the air got in first, because a hose, a loose fitting or a low reservoir that let the master cylinder suck air will simply put it back.

5. 5. Stopped at a light with steady foot pressure, the pedal slowly sinks toward the floor. There is no fluid on the ground and no wet spot at any wheel. The most likely cause is:

   • A. rotors with excessive thickness variation
   • B. a metering valve stuck open
   • C. glazed brake linings
   • D. master cylinder cup seals letting fluid bypass inside the cylinder
   Voir la réponse et l'explication

   Réponse : D. master cylinder cup seals letting fluid bypass inside the cylinder

   A pedal that sinks under constant pressure means fluid is going somewhere. With no external leak, it is going past the master cylinder cup seals and back into the reservoir, so the level can look perfectly normal. Keep this separate from the spongy pedal: spongy and pumps up points at air, slowly sinking under steady pressure points at the master cylinder. Rotor and lining problems change how the vehicle stops, not whether the pedal holds.

6. 6. Complete the sentence.

   A _____ valve limits how much pressure reaches the rear brakes during a hard stop, so the lighter loaded rear wheels do not lock before the fronts. A _____ valve holds pressure back from the front disc brakes at low pedal effort, so the rear drum shoes have time to overcome their return springs.

   Options pour le trou 1 : metering, residual pressure, proportioning, check

   Options pour le trou 2 : metering, proportioning, bypass, load sensing

   Voir la réponse et l'explication

   Réponse : proportioning, metering

   Both often live inside one combination valve along with the pressure differential switch that lights the brake warning lamp. The proportioning valve exists because weight shifts forward under braking and the rear tires lose grip. The metering valve exists because disc brake pads sit almost touching the rotor while drum shoes have to be pulled off their return springs first, so without it the front would grab before the rear did anything. Many newer vehicles handle rear pressure electronically through the ABS module instead of with a mechanical valve.

7. 7. No manufacturer bleeding sequence is available for a vehicle. Common practice is to start bleeding at the wheel farthest from the master cylinder and work toward the closest. The usual reason given is that:

   • A. the farthest wheel has the highest pressure in it
   • B. the longest line holds the most air, so clearing it first avoids pushing fluid back through circuits you already finished
   • C. the rear brakes need less fluid than the front brakes
   • D. starting at the closest wheel would damage the master cylinder
   Voir la réponse et l'explication

   Réponse : B. the longest line holds the most air, so clearing it first avoids pushing fluid back through circuits you already finished

   The point of a sequence is to move air out in an orderly way instead of chasing it around the system. Two things matter more than the habit itself. The manufacturer's published sequence always wins where one exists, and on many vehicles with ABS the module has to be commanded through a bleed routine with a scan tool or trapped air will never come out of it. Also bench bleed a new master cylinder before installing it, because air sitting in the cylinder bore is very hard to push out afterward.

8. 8. A pulsation felt in the brake pedal only while braking is most directly caused by:

   • A. excessive lateral runout of the rotor
   • B. thickness variation across the rotor
   • C. air trapped in the caliper
   • D. a worn wheel bearing
   Voir la réponse et l'explication

   Réponse : B. thickness variation across the rotor

   Thickness variation means the rotor is measurably thicker in some spots than others. As the thick spot passes between the pads, the caliper piston is pushed back, and that motion travels up the fluid column into your foot. Lateral runout is side to side wobble measured with a dial indicator, and by itself it does not move the pedal. It matters because the wobbling high spot keeps brushing the pads between stops and grinds thickness variation into the rotor over the following weeks, so runout found today is pulsation a month from now. Check runout with a dial indicator and thickness variation with a micrometer at several points around the rotor.

9. 9. On a floating caliper disc brake, the inboard pad is worn far more than the outboard pad. The most likely cause is:

   • A. brake fluid that is past its replacement interval
   • B. a restricted proportioning valve
   • C. caliper slides or bushings that are binding, so the caliper cannot move on its mounts
   • D. a rotor that is below minimum thickness
   Voir la réponse et l'explication

   Réponse : C. caliper slides or bushings that are binding, so the caliper cannot move on its mounts

   A floating caliper has pistons on the inboard side only. The piston pushes the inboard pad against the rotor, and the reaction force slides the whole caliper body inward to pull the outboard pad in behind it. If the slides are dry, corroded or have swollen bushings, the caliper cannot move, so the inboard pad does nearly all the work and wears out first. Clean and lubricate the slides with the specified high temperature grease whenever pads are replaced. A different pattern, both pads worn and the wheel hot after a drive, points at a piston or a hose that is not releasing.

10. 10. On many duo-servo drum brakes, when does the star wheel self adjuster take up lining wear?

    • A. Every time the brakes are applied while moving forward
    • B. Only when the drum is removed and the star wheel is turned by hand
    • C. Whenever the engine is started
    • D. When the brakes are applied while the vehicle is backing up
    Voir la réponse et l'explication

    Réponse : D. When the brakes are applied while the vehicle is backing up

    In that design the shoes float around slightly during a reverse stop, and that movement lets the adjuster lever climb one tooth and turn the star wheel. It is why a vehicle that is always parked nose out can develop a low pedal from underadjusted rear brakes, and why backing up and stopping a few times is a standard step after a drum brake job. Other designs advance the adjuster through the parking brake linkage instead, so on those the parking brake going unused causes the same low pedal. Either way, a self adjuster that is seized, installed on the wrong side or missing its spring stops adjusting entirely.

11. 11. In a duo-servo drum brake, which shoe does most of the stopping work when the vehicle is moving forward?

    • A. The secondary shoe, the one toward the rear of the vehicle
    • B. The primary shoe, the one toward the front of the vehicle
    • C. Both equally, because the wheel cylinder pushes them with the same force
    • D. Neither, because the parking brake strut carries the load
    Voir la réponse et l'explication

    Réponse : A. The secondary shoe, the one toward the rear of the vehicle

    The wheel cylinder pushes both shoes out with equal force, but the drum is turning. It drags the primary shoe along with it, and that force passes through the adjuster link at the bottom into the secondary shoe, wedging it harder into the drum. This self energizing action is where duo-servo gets its stopping power. It is also why the secondary lining is usually the longer of the two, so on reassembly the shorter lining goes toward the front of the vehicle. Swap them and the brakes will feel weak and the linings will wear unevenly.

12. 12. Which steps belong in a basic function test of a vacuum brake booster?

    Coche toutes les bonnes réponses.

    • A. With the engine off, press and release the pedal several times to use up any stored vacuum
    • B. Bleed the hydraulic system before any booster test can be considered valid
    • C. Hold steady pressure on the pedal and start the engine, expecting the pedal to drop slightly
    • D. Run the engine about a minute, shut it off, wait a minute, then check that the first one or two applications still feel assisted
    • E. Turn the master cylinder pushrod in until the pedal feels hard
    • F. Unplug a wheel speed sensor to isolate the booster from the ABS module
    Voir la réponse et l'explication

    Réponse : A. With the engine off, press and release the pedal several times to use up any stored vacuum, C. Hold steady pressure on the pedal and start the engine, expecting the pedal to drop slightly, D. Run the engine about a minute, shut it off, wait a minute, then check that the first one or two applications still feel assisted

    The three real checks are depleting the reserve, watching for the pedal to drop when the engine supplies vacuum, and then testing whether the booster holds a reserve after shutdown. A pedal that does not drop means the booster is not getting vacuum or is not working, so check the hose and the check valve before condemning it. A booster that assists while running but has no reserve after shutdown usually has a leaking check valve or a leaking diaphragm. Pushrod length is a measured adjustment, not something you turn in until the pedal feels right, because a rod that is too long keeps the master cylinder ports covered and the brakes drag.

13. 13. The main purpose of an antilock brake system is to:

    • A. shorten the stopping distance on every road surface
    • B. remove the need to bleed the base brake system
    • C. keep the wheels from locking so the driver can still steer during hard braking
    • D. apply the brakes automatically when the driver reacts too slowly
    Voir la réponse et l'explication

    Réponse : C. keep the wheels from locking so the driver can still steer during hard braking

    ABS senses a wheel about to lock and releases, holds and reapplies pressure at that wheel many times a second, which is the pulsing the driver feels. A rolling tire can still be steered, while a locked one just slides wherever momentum takes it. On loose gravel or deep snow a locked wheel builds a wedge of material ahead of it, so ABS can actually lengthen the stop there even though control is better. Two other points the test likes: ABS sits on top of the base brakes and cannot make up for worn pads or air in the lines, and automatic emergency braking is a separate system that happens to use the same hydraulic hardware.

14. 14. One wheel speed sensor circuit is suspected on a vehicle with ABS. Which checks belong in that diagnosis?

    Coche toutes les bonnes réponses.

    • A. Replace the master cylinder before testing the sensor
    • B. Measure the sensor's resistance and compare it with the specification
    • C. Inspect the tone ring for chipped or missing teeth and for packed debris
    • D. Check the brake fluid level, because low fluid switches the wheel speed sensors off
    • E. Measure AC voltage at the sensor terminals while turning the wheel by hand
    Voir la réponse et l'explication

    Réponse : B. Measure the sensor's resistance and compare it with the specification, C. Inspect the tone ring for chipped or missing teeth and for packed debris, E. Measure AC voltage at the sensor terminals while turning the wheel by hand

    A passive wheel speed sensor is a coil and a magnet. Spin the ring past it and it generates its own small alternating voltage, so a meter set to AC volts while you turn the wheel tells you whether it is producing a signal at all, and a resistance reading compared with spec tells you whether the winding is open or shorted. Just as important, a perfect sensor reads erratically if the tone ring is damaged or packed with rust and debris, so inspect the ring before condemning the sensor. Active sensor designs are powered and need a scan tool or an oscilloscope instead, so confirm which type you have first.

15. 15. Complete the sentence.

    A serviceable tapered roller wheel bearing is set by turning the hub while tightening the nut, which seats the rollers against their races. The nut is then backed off and retightened to leave a small amount of _____. Going tighter than that puts the bearing into _____, which makes it run hot and fail early.

    Options pour le trou 1 : endplay, preload, runout, taper

    Options pour le trou 2 : float, endplay, preload, backlash

    Voir la réponse et l'explication

    Réponse : endplay, preload

    Turning the hub while you tighten is what makes the adjustment repeatable, because it forces the rollers into place instead of leaving them cocked. Always follow the manufacturer's procedure and torque values, and always use a new cotter pin. A bearing that is too loose gives excessive play at the top and bottom of the tire and a noise that changes when the vehicle is swerved gently side to side, since cornering loads and unloads each side. A bearing that is too tight has no room for oil film or heat growth and will fail quickly. Sealed hub units are not adjustable, so on those you measure play and replace the unit.

Ce que couvre le test ASE A5 freins

Le A5 est l'un des tests de la série A destinée aux techniciens automobiles et véhicules utilitaires légers, fixée par le National Institute for Automotive Service Excellence aux États-Unis. Il reste à l'intérieur du système de freinage : diagnostic et réparation du circuit hydraulique, freins à tambour, freins à disque, dispositifs d'assistance, roulements de roue et frein de stationnement, et systèmes électroniques de contrôle du freinage comme l'ABS et les systèmes de stabilité bâtis dessus. Il s'agit de freins hydrauliques sur voitures et véhicules utilitaires légers. Les freins à air des véhicules industriels ne font pas partie du A5, ils relèvent de la série poids moyens et lourds, donc un guide de révision CDL sur les freins à air est le mauvais livre pour ce test.

La certification demande deux choses, pas une. Tu réussis le test, et tu justifies de deux ans d'expérience professionnelle pratique. Une formation pertinente peut remplacer une partie de cette expérience, et l'ASE publie les règles en vigueur sur la part concernée. La certification ne dure pas non plus éternellement. Elle expire et tu repasses le test pour la maintenir à jour, et c'est pour ça que les techniciens autour de toi parlent de se recertifier plutôt que de s'être certifiés une fois.

Les chiffres du jour du test bougent, donc cette page ne les citera pas. Le nombre de questions, la durée, le score qui fait passer, le coût de l'inscription et les fenêtres de passage ouvertes sont tous fixés par l'ASE et mis à jour au fil du temps. Prends-les directement chez l'ASE ou dans ta propre confirmation d'inscription, et considère que tout site d'entraînement qui les annonce peut être périmé.

Une chose vaut la peine d'être connue avant de commencer à réviser : la tournure des questions. Le A5 s'appuie beaucoup sur le diagnostic plutôt que sur la mémoire, et une bonne part des items sont écrits sous la forme du technicien A qui dit une chose et du technicien B qui en dit une autre. Nommer les pièces ne suffit pas. Il faut savoir quel symptôme chaque panne produit vraiment, et laquelle de deux explications plausibles colle aux indices donnés.

Comment utiliser cet échantillon

Ces 15 questions se répartissent sur les domaines du A5 plutôt que d'en creuser un seul. Il y a des questions d'hydraulique sur le maître-cylindre à double circuit, le liquide de frein et le toucher de pédale, des questions de tambour sur le montage duo-servo et le rattrapage automatique, des questions de disque sur l'état du disque et l'usure d'un étrier flottant, une question sur l'assistance, une sur un roulement de roue et deux sur le contrôle électronique du freinage. Elles demandent pourquoi un symptôme apparaît, pas seulement comment s'appelle une pièce, parce que c'est ce que fait le vrai test.

Fais-le d'une traite sans notes, puis lis l'explication de chaque question, y compris celles que tu as réussies. Traite une mauvaise réponse comme un thème plutôt que comme un fait. Si tu as raté la question sur les vibrations et celle sur l'usure de l'étrier, assieds-toi devant l'entretien des freins à disque dans son ensemble au lieu d'apprendre deux réponses par cœur.

L'habitude de révision la plus utile pour le A5, c'est d'apprendre les symptômes par paires, parce que c'est comme ça que le test sépare ceux qui ont lu un livre de ceux qui ont fait le travail. Une pédale spongieuse et une pédale qui s'enfonce lentement ne sont pas la même plainte. Une vibration et un tirage ne sont pas la même plainte. Le voile d'un disque et la variation d'épaisseur d'un disque se mesurent avec des outils différents et provoquent des choses différentes. Une fois que tu sais dire la paire à voix haute avec tes propres mots, les questions technicien A et technicien B cessent d'être piégeuses.

Ensuite, va mettre les mains sur le matériel. Dépose un tambour, manœuvre une roue crantée de rattrapage, fais coulisser un étrier, regarde une pédale descendre au démarrage du moteur. Les freins font partie des domaines où cinq minutes sur un véhicule réparent une incompréhension qu'une heure de lecture n'avait pas réglée.

Comment StudyPDF crée des tests complets à partir de ton propre matériel

Quinze questions peuvent te montrer quelles parties du système de freinage tu ne sais pas encore expliquer. Elles ne peuvent pas te rendre prêt à elles seules, et une banque de questions générique ne sait pas sur quel guide de révision tu travailles ni quels domaines ton atelier voit rarement.

StudyPDF part plutôt de ton matériel. Tu importes ton guide de révision A5, le chapitre freins d'un manuel d'atelier, ou les polycopiés de ton programme de formation, et Bo, l'agent de révision, crée des tests d'entraînement complets à partir de ces pages exactes. Chaque question est ancrée dans ton document, et chaque explication renvoie à l'endroit d'où vient la réponse, tu peux donc vérifier toi-même la formulation quand deux sources semblent se contredire. Tu peux générer de nouveaux tests aussi souvent que tu veux, en restreindre un à un seul domaine comme le diagnostic de l'ABS ou l'entretien des freins à tambour, et suivre les thèmes que tu rates sans arrêt.

Tu n'as pas besoin d'un fichier pour commencer. Si ton guide de révision est resté à l'atelier, nomme simplement un thème, par exemple le diagnostic du circuit hydraulique de freinage ou l'entretien des freins à disque, et Bo écrit un test d'entraînement dessus. Commencer est gratuit.