Automotive Tasksheet : C807
Contents
1. Test pedal free travel check power assist operation C807 CDX Automotive Tasksheet C807 Student Intern Information Learning objective task Test pedal free travel check power assist operation Recommended resource materials CDX General Service CDX Automotive Resource Kit CDX eTextbook Tech service bulletins Shop manuals and any other information applicable to the specific vehicle or components you are working on Some safety issues to consider Only students who have a valid driver s license and their supervisor instructor s direct permission should perform this task due to the safety concerns involved e When running any vehicles in the shop make sure you use the shop s exhaust ventilation system to discharge all exhaust gas safely outside Always wear correct protective eyewear and clothing and use the appropriate safety equipment as well as fender covers seat protectors and floor mat protectors e Make sure that you understand and observe all legislative and personal safety procedures when carrying out practical assignments If you are unsure of what these are ask your supervisor instructor Materials required Vehicle or brake system simulator Assignment 1 Research power booster description operation and testing procedure in the appropriate Service Manual a Specifications b Minimum time power booster should hold VACUUM 1 0 ee eeeteeeece cece ete e ee ee eee ee ae eae cette ee tee eee a2. a aaaeaaeeeeeeeeeeeeneeeaaaed 2 Test the ability of the power booster to provide assist 2009 Jones and Bartlett Publishers LLC Page 1 Test pedal free travel check power assist operation C807 CDX Automotive Tasksheet C807 a Without starting the vehicle depress the brake pedal several times This removes any vacuum from the brake booster Hold moderate foot pressure on the brake pedal and start the engine NB The brake pedal height should drop as the engine starts and the booster multiplies pedal pressure If the brake pedal height does not drop the power booster system is not working List your observations b If the power booster is not working follow the Service Manual procedure to determine the cause List any necessary action s 3 Test the ability of the power booster to hold vacuum a Without starting the vehicle depress the brake pedal several times This removes all vacuum from the brake booster and allows you to feel the brakes without vacuum assist Approximately how far down does the brake pedal go with moderate foot pressure b Start the engine wait a few seconds and depress the brake pedal once This allows you to feel the brakes with power assist This is how the brake pedal should respond if the power booster is holding vacuum properly Approximately how far down does the brake pedal travel with moderate foot pressure C Remove your foot from the brake pedal turn off the engine and wait the specified t
3. ime the power booster should hold vacuum listed above d After waiting the designated time and without starting the vehicle depress the brake pedal once and 2009 Jones and Bartlett Publishers LLC observe whether the brake pedal felt the same as in step 3 b above List your observations Page 2 Test pedal free travel check power assist operation C807 CDX Automotive Tasksheet C807 e If the brake pedal responded as in step 3 b the power booster is capable of holding vacuum and providing assist If this is the case no further inspection of the booster is needed f If the brake pedal responded as if it had no vacuum assist check the following conditions i Verify that the proper amount of vacuum is available to the power booster ii Inspect the booster for external leaks lil If no external leaks can be found inspect the check valve List observations found 4 Return the vehicle to beginning condition and return any tools that you may have used to their proper locations 5 Have your supervisor instructor verify satisfactory completion of this procedure any observations found and any necessary action s recommended 2009 Jones and Bartlett Publishers LLC Page 3 Test pedal free travel check power assist operation C807 CDC Automotive Tasksheet C807 Student s competency rating Supervisor instructor assessing performance marks applicable box O No information or practise provided during the program comple
4. te training required h General information provided with no practice time close supervision needed additional training required 2 Limited practice Has practiced job during training program additional training is required to develop skill k 2 x 3 Moderately skilled x 3 x 4 Skilled Can perform job independently with no additional training x amp x Has performed job independently during training program limited additional training may be required Supervisor instructoOr signature cccecceeeseceeeeceeeeeeeeeeeeeeeeeeseneeeeeseseneeeseseeeeneeeess Date gosta Svinte es SUPEFVISOF INSTFUCTOR NAME sesei enine aE lean E aE AEN a TEE gavel n vant A aa The tasks in this worksheet contain activities that also contribute towards the achievement of a range of educational and interdisciplinary skills These skills are variously described by such terms as Core Skills or Key Competencies or Applied Academics xC 8O7 x 2009 Jones and Bartlett Publishers LLC Page 4
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