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Walker's work doing's

Truck Shop

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Joined
Dec 7, 2015
Messages
17,527
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WWW.
Well i guess i get to learn about these finally, w

You will love those-that's what the manufacture always spouts. Those look like Bendix,
have to remove air can to get to adjuster. Have a caliper go bad and eat a rotor-$1,250
minimum. Better rig your self a support on a floor jack for removing hub and rotor.
I'll post a photo of what I have.
 

walkerv

Senior Member
Joined
Jan 21, 2016
Messages
1,125
Location
wingate nc
You will love those-that's what the manufacture always spouts. Those look like Bendix,
have to remove air can to get to adjuster. Have a caliper go bad and eat a rotor-$1,250
minimum. Better rig your self a support on a floor jack for removing hub and rotor.
I'll post a photo of what I have.
Meritor calipers appears to have an adjustor under a rubber cap , still know absoluting nothing about these , im hoping there is some service info on mack site as i have access to that .
 

DMiller

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Joined
Feb 21, 2010
Messages
16,937
Location
Hermann, Missouri
Occupation
Cheap "old" Geezer
My first taste of Air Disc Brakes, a Airport Fire Control and Tanker truck. Tandem all wheel drive, all six wheels, believe were Bendix, been almost forty years ago and trash back then.
 

kshansen

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Mar 11, 2012
Messages
11,272
Location
Central New York, USA
Occupation
Retired Mechanic in Stone Quarry
Last edited:

walkerv

Senior Member
Joined
Jan 21, 2016
Messages
1,125
Location
wingate nc
Im about 99 percent sure this is what is on these trucks . Looks fairly simple untill i have a major failure then its just going to be costly as truck shop stated., i also need to go online and find the manuals for the lift axles they didnt even send an operation book for them in the trucks which should have recommended air pressure settings and such so i willl just download and print them so i have a paper copy to go with my other lift axle books and an electronic copy in the shop laptop. Screenshot_20230116-204012_Chrome.jpg
 
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Truck Shop

Senior Member
Joined
Dec 7, 2015
Messages
17,527
Location
WWW.
Meritor calipers appears to have an adjustor under a rubber cap , still know absoluting nothing about these , im hoping there is some service info on mack site as i have access to that .

Which is nothing more than a copy of Bendix design. Don't bother buying the tooling to rebuild a caliper,
The tools are expensive and labor intensive-It comes down to a Caliper swap out. Average time to change
a wheel seal and rotor with total parts clean up 2 hours per-corner-In my fleet I actually do more disc
brake work than 90% of dealers. But all our tractors are going back to drum brakes, Disc simply are not
cost effective. I have 80 53' three axle trailer that are all disc when it comes time to change them out
it's going to cost on average $9,000 per trailer depending on how many calipers need to be changed.
6 corners of drum brakes-complete takes 1.5 hrs and $1,000.

005 (4).JPG
 

Truck Shop

Senior Member
Joined
Dec 7, 2015
Messages
17,527
Location
WWW.
Biggest problem with disc on drives-or duals, the rotor is tucked inside that inside wheel at lower
speeds the cooling air flow is zip. The rotor just continues to build heat especially in freeway stop
and go where high sudden air applications are common because of brake checks by other vehicles.
New rotor thickness is 44M, minimum is 36 to 37M. The thinner the rotor gets the faster it heats.
New rotors come with a shoulder on both sides as a indicator, when the shoulders are gone basically
the rotor is a done deal. There are trucks all over the U.S. freeways with defective disc brakes-Reason,
No one knows what they are dealing with and the other is cost--Runner till she drops.
 

walkerv

Senior Member
Joined
Jan 21, 2016
Messages
1,125
Location
wingate nc
The fact is you don't want disc on a drop axle-don't know why yours are spec'ed that way.
Really where discs work well is on the steer axle with drum on drop and drive. That's how
most out here on the left coast spec them now-after a long learning curve.
No clue boss man sent one of the new to us 2019 macks to the dealer and told salesman he wanted 2 trucks identical to that one . Guess they missed that it had drum brakes all the way around . If no foundation repairs are needed i do drums and shoes stupid fast without even trying , im not looking forward to inboard mounted rotor replacments at all. Your jack fixture looks good i will fab one up when the time comes.
 

walkerv

Senior Member
Joined
Jan 21, 2016
Messages
1,125
Location
wingate nc
Nice looking deck work. Mike, that is a slick fixture for an ugly job.
Normally we just have random sized oak and have to rip it and trim it ,the guy that cut the wood this time actually measured stuff and planned out the board widths the goal was for an actuall clean install and is probably the best one we have done since it was a new trailer .the counter sink was just icing and the owner of the company really like it .
 

skyking1

Senior Member
Joined
Nov 3, 2020
Messages
7,996
Location
washington
I did apitong on the company trailers.
The old oak was fall through the deck rotten. I got to use my #8 baliey plane to straighten things out.
IMG-20200717-094045.jpg

I like the apitong and the off-cuts are some serious blocking pieces.
PXL-20220616-191812825.jpg
 

walkerv

Senior Member
Joined
Jan 21, 2016
Messages
1,125
Location
wingate nc
I did apitong on the company trailers.
The old oak was fall through the deck rotten. I got to use my #8 baliey plane to straighten things out.
IMG-20200717-094045.jpg

I like the apitong and the off-cuts are some serious blocking pieces.
PXL-20220616-191812825.jpg
We save white oaks when we do clearings and have them cut for us . Our lowboy has plates under the wood so even when it rots off its not to big of a deal . The wood we just took off was about half rotten when we put it on and it lasted about a year and a half this stuff was just cut it should last awhile longer .
 

skyking1

Senior Member
Joined
Nov 3, 2020
Messages
7,996
Location
washington
that oak deck was original 2006. Should have been done 10 years ago.
We don't have white oak out west. I do use green (Uncured) white oak for any bending projects; when it is ripped straight grain properly and put in a steam box, you can do wonderful bends with white oak.
 

walkerv

Senior Member
Joined
Jan 21, 2016
Messages
1,125
Location
wingate nc
3126 found a loose jam nut from a 3rd party repair a year ago , not sayying it couldnt happen to anyone but i personally have never had a jam nut come loose . Not sure what it jammed against to bend it but everything looks ok so im gonna order in a new push rod and run the valves and see what happens .this is in our lube truck so it is vital to get going asap .20230222_144921.jpg
 
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