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Uncaging Wedge Brakes

Posted By kblackav8or 3 Months Ago
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kblackav8or
Posted 3 Months Ago
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I haven't messed around with it in a few days - working on other stuff.  Hopefully getting it where I can move it and will need some parking brakes.  Did get the clutch working but now it is running pretty awful. 


1986 Peterbilt 359
I do all my own stunts. 

Geoff Weeks
Posted 3 Months Ago
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rubbishman (9/9/2021)
The one with the black cap looks like the MGM piston type. The bolt stays in the piston and takes the load off as you turn it out.
I need to pull out the MGM catalogs to be sure.

If you are refering to the one with the aluminum housing and the plastic cap, yes it is an "Indinanhead"  or later MGM Stopguard" piston chamber and the bolt gets backed off to release the brake. I have 4 of them on S cams.
rubbishman
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The one with the black cap looks like the MGM piston type. The bolt stays in the piston and takes the load off as you turn it out.
I need to pull out the MGM catalogs to be sure.

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wayne graham
Posted 3 Months Ago
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Geoff, I think you are correct. Been a long time since I had any thing with stop masters.



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Geoff Weeks
Posted 3 Months Ago
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wow, got a little bit of everything going on. There is a T bolt and a captive bolt type on the front drive and a Maxi-can on the rear. I think that is service brake only. Does one  of the air lines run from one side to the can on the other on the rear axle?
 The one with the cast aluminum "can" with the cover over the bolt, you back the bolt all the way out to back off the spring brake. The T bolt, I think you know what to do, The Maxi-can I THINK is service only, no spring brake in that one, but I could be wrong. 
Should have said rotochamber.
kblackav8or
Posted 3 Months Ago
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http://forums.justoldtrucks.com/uploads/images/9d56b804-e9a5-4250-83a0-8678.jpg

http://forums.justoldtrucks.com/uploads/images/f0f1c62a-2245-40f2-a5da-640b.jpg

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1986 Peterbilt 359
I do all my own stunts. 

Geoff Weeks
Posted 3 Months Ago
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kblackav8or (9/5/2021)
It looks more like the permanent bolt setup not the usual caging bolt which I am familiar with.  IE there is just a bolt in the center hole on all but one that appears like it is part of the normal assembly.  Not threaded stud / with nut.  Any caution associated with messing with that center bolt? 

Picture would help, but a piston type chamber you back the bolt out to release the brake. the bolt is captive and does not come out of the piston, 
 On piston type chambers it does not "cage the spring", but allows the piston to go to its full applied position without transmitting that movement to the service chamber and therefore the brake itself.
You a wise to be cautious if you are not sure what you are dealing with. Without a picture I am not 100% sure what you are dealing with.
jhancock
Posted 3 Months Ago
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May have some helpful info for your adventure with wedge brakes.

http://manuals.chudov.com/Grove-Rough-Terrain-Crane/Meritor-Wedge-Brakes.pdf

https://www.axletech.com/at-admin/resources/Manuals/bsm-0381ewedge-brakes.pdf


Jim

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kblackav8or
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It looks more like the permanent bolt setup not the usual caging bolt which I am familiar with.  IE there is just a bolt in the center hole on all but one that appears like it is part of the normal assembly.  Not threaded stud / with nut.  Any caution associated with messing with that center bolt? 


1986 Peterbilt 359
I do all my own stunts. 

Geoff Weeks
Posted 3 Months Ago
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Depends on what chambers it has.  Some piston chambers have a bolt that is permanently in the chamber  Diaphragm types use the T bolt and nut. 


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