Table of Contents
Explanation Check hydraulic brakes by pumping the brake pedal three times before applying firm pressure to the pedal for five seconds. The pedal should not move. If it does, there may be a leak or some other problem in the braking system.
How do you check hydraulic brakes?
Hydraulic Brake Check With the engine running, apply firm pressure to the service (foot) brake pedal and hold for five seconds. The brake pedal should not move (depress) during the five seconds.
How do you test hydraulic brakes for their stopping action?
Test the hydraulic brakes (if equipped) by pressing the brake pedal three times, and then holding the pedal for 5 seconds; the pedal should not move. Move the vehicle forward and apply the parking brake. If the parking brake works, release it and test the service-brake stopping action.
Which three test would you perform on a hydraulic system?
Often the only tests and actions performed on a hydraulic system involve changing the filters, sampling the oil and checking the oil level.
When inspecting the brake assembly you should ensure CMV?
when inspecting the brake assembly, you should ensure: whenever a change of duty status is made, every three hours, or 150 miles, whichever comes first. after the initial 50-mile check, how often must you conduct additional on the road inspections of the cargo securement & securement deviices?.
At what speed should you test the stopping action of the service brakes?
Test the Service Brake Stopping Action Drive the vehicle about 5 mph. Push the brake pedal firmly. “Pulling” to one side or the other can mean brake trouble.
How many red reflectors should you carry?
Cards In This Set Front Back What should wheel bearing seals be checked for? Hub oil level and no leaks Hub oil either laying in the rim or covering the rim. How many red reflective triangles should you carry? 3.
Where or when should you test the stopping action of your service brakes?
Where or when should you test the stopping action of your service brakes? When the vehicle is moving at about 5 MPH. Stab braking: Involves locking the wheels.
How do you test a hydraulic system?
Operating the Hydraulic Tester Open the hydraulic tester load valve. Start the electric motor or the engine and adjust it to the manufacturer’s recommended operating speed. Slowly close the hydraulic tester load valve to load the system. Continue loading the system until normal operating temperature is reached.
How a brake roller test should be conducted?
The test involves measuring the distance it takes to stop – 100 km/h to a standstill. While this may be a standard, it is not always a practical test to perform. Each wheel is tested with this equipment, and braking is measured by the roller when the vehicle brakes are applied.
How do you check the brake chamber pushrod travel?
Pull the chamber push rod out to its limit by pulling on the slack adjuster arm or by prying with a short bar. If push rod travel is more than 3/4 in. (19 mm), brakes MUST be adjusted.
How do you test hydraulic brakes for leaks CDL?
Test for hydraulic leaks: If the vehicle has hydraulic brakes, pump the brake pedal three times. Then apply firm pressure to the pedal and hold for five seconds. The pedal should not move. If it does, there may be a leak or other problem.
What is stab braking method?
Explanation The stab braking method for emergency stops involves fully applying the brakes until they lock up. The brakes are then released until the wheels start rolling, and then the process is repeated.
How do you tell the difference between manual and automatic slack adjusters?
Automatic slack adjusters have an adjusting mechanism that adjusts for brake lining wear. However, manual slack adjuster periodically needs to be adjusted to properly function and operate at peak performance and compensate for lining wear.
When going down a long steep downgrade you should always?
When going down a long steep downgrade you should always: Use the braking effect of the engine. You must park on a side of a level, straight, four-lane divided highway.
Why should you limit the use of your horn?
You should limit the use of your horn because it can startle other drivers. 53. Rough acceleration can cause mechanical damage.
When you are being tailgated you should?
When you are being tailgated: Move over to the right, if there is an open lane to your right. If there is not an open lane to your right, wait until the way is clear ahead and reduce your speed slowly to encourage the tailgater to drive around you. Never slow down abruptly.
Where do triangles go when broken down?
As a rule of thumb, you should put the first warning triangle 10 feet directly behind your car on the side closest to the road. Then place the second warning triangle 100 feet behind your vehicle, lining it up directly in the middle of your car’s position.
What three emergency equipment must you have?
What three kinds of emergency equipment must you have? Spare electrical fuses, three red reflective triangles, properly charged and rated fire extinguisher.
When should you put out a triangle?
Warning triangles can save a life — yours or another person’s — but only if you place them correctly.FMCSA Guidelines For Placing Warning Devices If you have to stop on the shoulder or on a lane of travel, turn on your hazards. Place the triangles within 10 minutes or as quickly as possible.
Which of these is not a brake check you normally do during your walk around inspection?
Which of these is not a brake check you normally do during your walk-around inspection? A Brake adjustment.
What is a red triangle with an orange center?
The bright, reflective orange triangle with red border is a warning that a Slow Moving Vehicle (SMV) is in front of you. These simple triangles alert drivers that they need to slow down and keep a safe distance behind the farmer until it is safe to pass.
What is troubleshooting in hydraulic system?
Gradual or sudden loss of pressure or flow resulting in a loss of power is common in hydraulic system failure. Any one of the system’s components may be at fault. These step-by-step procedures should help you locate and remedy the problem quickly. SYSTEM INOPERATIVE. No oil in system, insufficient oil in system.
What causes hydraulic system failure?
Air and water contamination are the leading causes of hydraulic failure, accounting for 80 to 90% of hydraulic failures. Faulty pumps, system breaches or temperature issues often cause both types of contamination. Usually, loose connections or leaks in the system cause this issue.
