How to Replace Slack Adjusters on an Air Brake System
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- เผยแพร่เมื่อ 18 ก.พ. 2022
- A pretty easy slack adjuster replacement. They don’t all go this easy. I’ve had to cut S-cams to get a slack adjuster off. I’ve had to melt the snap-ring out with a torch as well. There are bushings in the S-cam tubes that should be inspected and replaced. The ones in this truck probably should be replaced and may be replaced in the near future.
*note* I should’ve put grease or anti seize on the S-cam shaft before reinstalling the new slack adjuster. I don’t get it right all the time.
I want to thank the owner of this company for allowing me to record my repair videos. Thanks Boss Man.
Slack adjuster explanation by #bendix
• Bendix Tech Talk: Slac...
Mike The Mechanic
Shade tree or gravel parking lot . I’m your guy.
@@MikesMischief
Thats how the money is made
I’ll take mechanic work inside over working outside when it’s this cold out.
Always love to work on my truck. I Never can trust to those “certified”. Now it time to replace my slack adjusters and I saw what I needed. Thank you sir
Nothing ever goes as planed so it can be difficult to make a coherent mechanical video on the fly like I do. My hope is to help others see how easy most of this stuff is. I’m far from perfect but much more affordable than a shop and I know where my mistakes are.
Im with you on the brake adj. Lifting the axle and rotating the tire. The surest.
Hey there Mike a big hello from Fort Myers Florida , very interesting video brother to me it’s good knowledge and good Study material, and by the way I like the farmers way, 👌😀 so yeah thank you very much for sharing appreciate, 👋👍👍
Thank you Roberto.
Good video, going to change the slack adjuster Friday on a dump truck, you help tremendously me out on this video, also the second method for adjusting the breaks works for me. My boss likes the first way.
Thank you sir. If you have trouble you can message me on instagram and maybe I’ll be able to help you through.
Robert’s Garage sent me. Those slacks have been in for a while.
It was pretty crispy lol. I didn’t have to cut the s-cam so I’m either getting better at these or or I got lucky.
Here in Canada you have to cut most of them off if they have never been changed. Usually I torch the slack off by cutting a grove into it and air hammering it off. You can save the s cam this way.
Great job man
Thanks
Manufacturers make slack adjuster pullers that work well . A template is supplied with this Rockwell / Meritor slack adjuster to cut the proper length of the pushrod if needed . The proper installation will end up with the slack adjuster 90 degrees to the push tube . Well done job .
I really should put a disclaimer stating that I’m not a certified mechanic at the beginning of my videos. I’m self taught for the most part. I’m sure there’s easier ways and a book somewhere telling a guy exactly how to do it properly. I’m relatively humble and I know there’s guys and probably gals out there that know far more than I do. The truck has now been retired from service but the driver said the brakes hadn’t worked that good since he bought the truck so I must’ve gotten lucky this time.
@@MikesMischief You did well , please take my comments as constructive criticism . I was not knocking you .
For sure. I took it as constructive.
@@MikesMischief ahh not luck my friend, just good common sense, which you appear to possess plenty of.
thanks really appreciate the info.
Thank you for the comment!
He said they’re not dangerous🤣🤣
With your wheels off, just tap the s cam inward. That will release the pressure on the snap ring.
Hello. I loved this video. Question. How can I tell if I need new slack adjusters? If I just had the new drums and brakes put on and there’s a gap already on my steers were my ASAs supposed to adjust to close the gap or did the mechanic just back them off too much? Thank you!
Some shops back the steers off more than the drives. If you have automatic adjusters they “should”‘adjust themselves as soon as you hit the brake pedal. If they’re old and gummed up inside There’s a good chance they need to be replaced. You can check the heal pin to make sure it’s there. Could be worn out S-cam bushings also. You could function check the adjusters by backing the brakes off and hitting the brake pedal a few times to see if they tighten up.
@@MikesMischief Ok thank you. They had just backed them off too much. Got it taken care of.
❤
How you change on a Mack (right side) where it can’t slide out life the left side. Since the “axle is not centered” or drive shaft not sure it it makes sense.
I’ve never worked on a Mack. But I’d assume you’ll have to remove the tire and Break drum and slide the S-cam out a little bit so you can drop the adjuster out.
Nice video, and coincidentally that is the exact same slack adjuster that I need to replace (Meritor 3275-V-1141P). Meritor aftermarket parts seem to have a different p/n, and I haven't found an interchange list. Would you have the p/n of the replacement slack adjuster? I know it has been a year (or maybe more), but thought I would ask.
I can certainly try to find out. Or I can give you the last 6 of the vin on that truck so you can order from a dealership. Most dealerships in the Midwest will give you a p/n if you call with the last 6 of your vin if you have it. Otherwise I’ll get the vin off of that truck if I remember the next time I’m at the shop.
@@MikesMischief our RV uses a Freightliner chassis and their price was surprisingly good. No need to dig that info up. I should have waited for the Freightliner quote! But great job on the video.
I appreciate the compliment. Most dealers are pretty competitive price wise on stuff like that. If you have some JB80 or PB blaster it doesn’t hurt to start giving everything a good soak a day or so before. Use #2 moly grease and don’t over grease the new slacks. Good luck.
Hey is there a difference between slack adjusters for driver side compared to passenger side? Or are they universal??? Looking to change driver side on a Wabash trailer. Have any idea?
They’re universal L & R. But brand/style wise I’m not sure. Most newer slack adjusters are automatic. Pre 1994 might still have the old manual adjust style. Your trailer should have a vin number. Call up Wabash and see if they know what style yours has or if they have a part number.
@@MikesMischief i did call them and they said driver/passenger side is universal but when I brought it home my dad with more (30 years) experience said it won't fit correctly on the driver side. Dad said I'm an idiot and the dealer is an idiot. But we didn't go to trailer yet to make sure. So are you saying passenger and driver side adjusters are unique, or interchangeable?? Your explanation confused me.
@@wisejustice7742 they should be interchangeable.
@@MikesMischief It was interchangeable like you and the dealers said. Dad never apologized for calling me nor everyone else an idiot. 🤷♂️ Oh but he was 100% sure about it!
There are two different styles, handed and unhanded. Most slack adjusters are unhanded, meaning they can go on either the left or right side. Handed slack adjusters have the button on the side instead of on the back. If you get one of those the button has to go on the inside away from the wheel.
@ 1:35 that’s called a snap ring
I’ve been working in shops for 20 years and I know what they’re called. For some reason when I’m filming it’s like my brain shuts off. I stutter, lose my train of thought and mis speak and mumble a lot. Kind of weird because if I’m not filming I don’t have those problems.
@@MikesMischief you’re not alone buddy,the same happens to me
@@sireposey8556 I sincerely hope that it’s only when I’m filming. Maybe it’s all the time and I don’t realize it..
The slack probabbly hasn’t been greased properly make sure to grease your undercarriages properly or shut like this goes down All the time mechanic from the rust belt
Thanks