AIR BRAKE LEAK DOWN TEST

http://www.part380.com/si393.html
Doing the air brake leak down test lets you know 1) there are no leaks and 2) the automatic slack adjusters have "adjusted," and that the air brakes should be "in balance."
NOTE: Chock wheels and release (push IN) both red and yellow knobs (or yellow knob on a straight truck) to avoid compounding the brakes.

Category:

Education

Tags:

• air
• brake
• leak
• down
• test
• trucking
• DOT

[Fishzaft1]

DDUDE!!! u have to mention to engage the PRKING BRAKE B4 U DO THE AIR LEAK TEST!!!!!

[part380]

@Fishzaft1 Correct.

If you follow your State's CDL manual it may suggest testing air brakes in the following sequence:

1) Stall test - check if brakes hold vehicle i) build air pressure

 ii) push in Red (trailer) button iii) do stall test in about 3rd gear iv) shut engine (in gear); release or push in Yellow (Park) button

2) Leak Down Test - where this video starts

[msmissdme]

Its only 4 psi in adouble or combination, please be accurate when talking theres lots of newbies out here trying to get it down for the test!

Thank you.

[part380]

@msmissdme What "it" are you referencing? Thanks.

[arohn2007]

I thought you only had air pressure when the truck is running or for a little while after its been shutdown? Why are you still getting air pressure?

[part380]

If you follow your State's CDL manual it may suggest testing air brakes in the following sequence:

1) Stall test - check if brakes hold vehicle i) build air pressure ii) push in Red (trailer) button iii) do stall test in about 3rd gear iv) shut engine (in gear); release or push in Yellow (Park) button

2) Leak Down Test - where this video starts

3) Pop-off test - Fan brake (pedal) until Red and Yellow both pop out.

Other tests as Air Build up may be included.

Thanks. Best regards

[24preacherboy]

Same rules apply to Mexican drivers.

[Moparornocar74]

Auto slacks or not you still need to go under the truck to actually check your breaks

[Fishzaft1]

Sorry release parking brake

[oneangelsience1979]

im currently reading the manual for my permit and yhis tips will be kept in mind

[oneangelsience1979]

im currently reading the manual for my permit and yhis tips will be kepy in mind

[jonnyboy0036]

hahahaha fully stroked

[polancovideos]

ESTE FRIEND NO ENSENA NADA SOLO SE ANUNCIA

[emerson5478]

So I just stroke my brake twice and automatically my slacks would be adjusted?