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Old 06-27-2015, 09:57 PM   #15
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NTSB: Don’t manually adjust automatic slack adjusters | eTrucker: Trucking News, Truck Driver Jobs, Diesel Fuel Prices, Loads, Routing,& More!
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Old 06-28-2015, 09:15 AM   #16
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Ha!, figured some go by the book person would disagree with adjusting auto slack adjusters, you that disagree, stop by Truck inspection facility some time and ask the Badges inside......If I do NOT manually adjust them 2X a year they are NOT legal....carry on with your reading.
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Old 06-28-2015, 10:23 AM   #17
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Ha!, figured some go by the book person would disagree with adjusting auto slack adjusters, you that disagree, stop by Truck inspection facility some time and ask the Badges inside......If I do NOT manually adjust them 2X a year they are NOT legal....carry on with your reading.
Never disagreed with anything posted, just passing on some interesting info.

"By the book"? Hahahaha.
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Old 06-28-2015, 01:09 PM   #18
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Auto slack adjusters require manual adjustment twice a year depending on miles.

Could you define "Auto slack adjusters require manual adjustment". The reason I ask is that for one I am brand new to air brakes and second this thread has been talking about adjusting via pushing on the brake hard multiple times. I've also watched a manual adjustment video, which was done with a wrench.
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Old 06-28-2015, 01:48 PM   #19
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I think the NTSB link is refering to crawling under with 3/4" wrench in hand !
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Old 06-29-2015, 02:06 AM   #20
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Could you define "Auto slack adjusters require manual adjustment". The reason I ask is that for one I am brand new to air brakes and second this thread has been talking about adjusting via pushing on the brake hard multiple times. I've also watched a manual adjustment video, which was done with a wrench.
Manually with usually a 3/8" wrench, tighten and back off (against the ratchet) 1/4 turn.
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Old 06-29-2015, 05:48 AM   #21
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Manually with usually a 3/8" wrench, tighten and back off (against the ratchet) 1/4 turn.
For people who are new to air brakes. Although that is the basic procedure, there is a bit more then that.

You need to make sure the air pressure is up, the wheels chocked and the parking brake is off, if you are checking the rear brakes. If you turn the adjusters the wrong way, you loosen your brakes. ( I've seen it )

I understand that the DOT inspectors, are real sticklers about brake adjustments.

Since MHs don't stop at inspection stations, I would let the self adjusters do their job.

You should do a visual inspection of slack adjuster movement, as recommended, and if there is a excessive of movement, get an air brake shop to inspect the brakes.

But even the visual inspection, is with the parking brake off, so blocking the wheels and an assistant is necessary.

There seems to be a consensus about pumping the brakes before a trip, to adjust them. Running the air down to check recovery time, is part of the air system check, anyway. It won't hurt anything.

Now, about the mechanics of self adjusters. As the brakes wear, the slack adjuster moves a longer distance, out. If it moves to far, it ratchets a bit to shorten the movement. If you are light on the brakes, there is less wear, so there should be less movement.

If you are not wearing down your brakes, how are they coming out of adjustment.

Another point, although only applying to the rear, spring brake, is, when you set the parking brake, the spring pressure will force the slack adjusters out, almost as far as a heavy brake application. When you release the parking brake, if there was to much movement, the auto adjuster will adjust it.

Just my take on things.
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Old 06-29-2015, 06:32 PM   #22
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For people who are new to air brakes. Although that is the basic procedure, there is a bit more then that.

You need to make sure the air pressure is up, the wheels chocked and the parking brake is off, if you are checking the rear brakes. If you turn the adjusters the wrong way, you loosen your brakes. ( I've seen it )

I understand that the DOT inspectors, are real sticklers about brake adjustments.

Since MHs don't stop at inspection stations, I would let the self adjusters do their job.

You should do a visual inspection of slack adjuster movement, as recommended, and if there is a excessive of movement, get an air brake shop to inspect the brakes.

But even the visual inspection, is with the parking brake off, so blocking the wheels and an assistant is necessary.

There seems to be a consensus about pumping the brakes before a trip, to adjust them. Running the air down to check recovery time, is part of the air system check, anyway. It won't hurt anything.

Now, about the mechanics of self adjusters. As the brakes wear, the slack adjuster moves a longer distance, out. If it moves to far, it ratchets a bit to shorten the movement. If you are light on the brakes, there is less wear, so there should be less movement.

If you are not wearing down your brakes, how are they coming out of adjustment.

Another point, although only applying to the rear, spring brake, is, when you set the parking brake, the spring pressure will force the slack adjusters out, almost as far as a heavy brake application. When you release the parking brake, if there was to much movement, the auto adjuster will adjust it.

Just my take on things.
Thanks, didn't have time to explain like you did, let me add that if one is tighter than the rest obviously it will get a lot warmer and that's how a lot of wet wheel seals go bad.
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Old 06-29-2015, 06:39 PM   #23
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Any "Manual" slack adjusters that I ever worked with, required a 9/16" box end wrench.
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Old 06-29-2015, 08:13 PM   #24
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Your right, a 9/16 wrench.

It does fit a 3/8 bolt or nut.

Maybe self adjusters use 3/8.

Moved on to construction equipment, when they became popular.
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Old 06-30-2015, 02:12 AM   #25
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Any "Manual" slack adjusters that I ever worked with, required a 9/16" box end wrench.
Manually adjusting a automatic slack adjuster
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Old 07-01-2015, 12:39 AM   #26
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Thanks, didn't have time to explain like you did, let me add that if one is tighter than the rest obviously it will get a lot warmer and that's how a lot of wet wheel seals go bad.
Could not agree more with you on that. I don't think newbee's should do it without being shown the right way. It is like you say if you adjust it too tight it will get hot.
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Old 07-01-2015, 08:25 PM   #27
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Ha!, figured some go by the book person would disagree with adjusting auto slack adjusters, you that disagree, stop by Truck inspection facility some time and ask the Badges inside......If I do NOT manually adjust them 2X a year they are NOT legal....carry on with your reading.
You may want to reconsider: Safety Recommendation H-06-008
http://www.cdc.gov/niosh/docs/2010-1...s/2010-102.pdf
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Old 07-02-2015, 08:15 AM   #28
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So I should print these out, carry them with me, don't manually adjust my auto slack brakes and when I get pulled in for inspection with out of adjustment service brakes hand over the paper work that was written by the U S Government and I'll be good to go?? Give me your phone number and I'll let you know how that works! I have been in the Heavy Equipment Transport Business since 1980, I will not change the way I have been keeping my Trucks and Trailers safe with ZERO ACCIDENTS, and I sure the hay don't care what the Government (NTSB) has to say about SAFETY when I have a much better record than they do!
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