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Thread: Drive Axle Drum Brakes

  1. #21
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    May 2012
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    Joe,

    Wow! How long do you think that was in service?


    Gil and Durlene
    2003 H-3 Hoffman Conversion

  2. #22
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    Mar 2013
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    Long enough to get ALL its good removed. Just for the record the brakes on the hub this came off of were not sticking and still retracting sufficient enough to keep anything dragging. There is that spring between the shoes that also aids in the function. When it brakes the bottom shoe drops and drags and wears out rapidly seen that plenty over the years too.

    Gill.....when u show this to a coustomer and they ask is that bad how do u respond? What should I infer from the question? Lol

    Farmers..............

    Mr Green Jeans that's me today.
    Last edited by Joe Camper; 06-15-2017 at 11:41 AM.
    1990 Peterbuilt 377
    3406 B Caterpillar
    9 Speed Roadranger
    708 243 7871

  3. #23
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    Mar 2013
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    Back to s cam tid bits

    20170615_115309.jpg

    If u leave them in there long enough with nylon bushings and no grease they will look like this. This is the riding surface fot the bushing next to the spline where the slack adjuster is. It will always wear more than the surface at the cam end and the cam end always wears more uniformly . It will also wear really bad on the backside that is what i was trying to display with the photo of this worn used s cam. Bottom in the photo.

    Back in the day it was common practice for some types to
    Flip them 180 and wear the other half down when they look like this It does take out a certain amount of slop and these r for sure beyond safe service I'd never reinstall this, accept for Captain Kangaroo, and I do have him for a coustomer.

    BUT

    It is defiantly a step that should be used when reinstalling just slightly worn ones, IE, all u guys. Get them all turned 180. In fact when reusing serviceable cams ALSO make a point of being sure they r all either as was or all flipped to keep them all in harmony. When just slightly worn u gotta look close to be sure too.

    20170615_115402.jpg

    Mr Sloppy.

    Keep them campers happy!
    Last edited by Joe Camper; 06-15-2017 at 02:07 PM.
    1990 Peterbuilt 377
    3406 B Caterpillar
    9 Speed Roadranger
    708 243 7871

  4. #24
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    Mar 2013
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    Chicago
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    More drum brake.

    U guys with the drum brakes on the drive axles. 2000 and older.

    U know those 2 grease fittings that r right next to each other on 6in extensions for the drum brakes?

    20171102_103512.jpg

    20171102_103522.jpg

    If your service center is greasing those at the same rate as everything else this is what happens. And it doesn't take long.

    Do not grease those but very slightly. They need next to nothing.
    Attached Images Attached Images
    Last edited by Joe Camper; 11-02-2017 at 11:58 PM.
    1990 Peterbuilt 377
    3406 B Caterpillar
    9 Speed Roadranger
    708 243 7871

  5. #25
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    Mar 2013
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    Chicago
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    20171102_170421.jpg

    Look how nice the linings cleaned up and dried out. Think it will stop better?

    20171102_170048.jpg

    Everything needs to come apart. I'm the first one to ever dis assemble a lot of this and it's 30 yr old. I've managed to do it without unnessessarily damaging anything. Look how pretty that all is.

    Less than 1/1000th wear on the s cam, that's pretty unbelievable . Maybe 1/1000th on the brake shoe pins. 113,000 miles on the bus. The pins were stuck they needed heat. The hub and drum had to be soaked overnight and persuaded apart with a great deal of determination. It all needed to be done. The clevis pin on the slack adjuster was froze up. Might seem small but that binds the brakes.

    All the tapered drum screws required Heat not to mention all original and there is evidence of recent inner hub seal replacement. So some shop couldn't get the drum and hub apart so pulled it togeather, not good. Then reassembled with components still in the condition of the pictures, nasty oily not even touched.
    Last edited by Joe Camper; 11-03-2017 at 12:59 AM.
    1990 Peterbuilt 377
    3406 B Caterpillar
    9 Speed Roadranger
    708 243 7871

  6. #26
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    20171102_170101.jpg

    The shoes r very heavy duty. These pin bushings, along with s cam bushings, r brass. That's a cut above. Very nice.

    20171102_103533.jpg

    EVERY TIME u pull a drum or service tag and steer drum brakes, this would be older than 1993 or so, REPLACE THE RETURN SPRINGS. If u don't find one broken already on the bus it will be amazing or already replaced. They r way smaller than drive axle return Springs and I see broken ones all the time.
    Last edited by Joe Camper; 11-03-2017 at 12:20 AM.
    1990 Peterbuilt 377
    3406 B Caterpillar
    9 Speed Roadranger
    708 243 7871

  7. #27
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    Mar 2013
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    Chicago
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    20171102_103253.jpg

    After heating and beating stuff apart. It got wire brushed, scrubbed with diesel fuel, sprayed with brake parts cleaner wire brushed again. I'll paint it all put new grease fittings. Synthetic grease and lucas hub oil.

    Beyond that it will get new service brake diaphragms, 1/2 in brake hose, new r12 brake relay valves and a new set of shocks.

    This old bus is Gettin some real good lovin. It's gonna go like a bently.

    And real quality professionally done brake adjustments r something u need to experiance in order to appreciate. My stuff stops as good as mechanically possible.

    20171102_170125.jpg

    Look at this s cam. It was quite bound up. Once I got it out and cleaned it up its about as pretty as a cam with 100000 miles can be. It was almost frozen just not quite.

    Both tag and both steer hubs will be getting this same attention. That also puts all 4 hubs, set by the same hands, very good ones. That's a good thing.
    Last edited by Joe Camper; 11-03-2017 at 12:56 AM.
    1990 Peterbuilt 377
    3406 B Caterpillar
    9 Speed Roadranger
    708 243 7871

  8. #28
    Join Date
    Oct 2012
    Location
    Smithville
    Posts
    129

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    Quote Originally Posted by Joe Camper View Post
    Back to s cam tid bits

    20170615_115309.jpg

    If u leave them in there long enough with nylon bushings and no grease they will look like this. This is the riding surface fot the bushing next to the spline where the slack adjuster is. It will always wear more than the surface at the cam end and the cam end always wears more uniformly . It will also wear really bad on the backside that is what i was trying to display with the photo of this worn used s cam. Bottom in the photo.

    Back in the day it was common practice for some types to
    Flip them 180 and wear the other half down when they look like this It does take out a certain amount of slop and these r for sure beyond safe service I'd never reinstall this, accept for Captain Kangaroo, and I do have him for a coustomer.

    BUT

    It is defiantly a step that should be used when reinstalling just slightly worn ones, IE, all u guys. Get them all turned 180. In fact when reusing serviceable cams ALSO make a point of being sure they r all either as was or all flipped to keep them all in harmony. When just slightly worn u gotta look close to be sure too.

    20170615_115402.jpg

    Mr Sloppy.

    Keep them campers happy!
    Joe,
    Is this Your shop ? The reason I ask is , We have a red Ford Think 4 seater like the one in the background. Cool little carts.
    My Wife said " You have Gone Crazy " When I purchased the Coach. Now She says , " DONT SELL THE BUS"
    ​Email; libertycoach322@gmail.com


    Safe Travels,
    Rocky

  9. #29
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    Mar 2013
    Location
    Chicago
    Posts
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    That one is a PU front seat and bed.

    That is my shop every year, early summer for as much as I can take usually 3 or 4 months.

    I put a cherry floor in a CC about 5 or 6 yr ago. The owner and I hit it off pretty good and he invited me to come stay on a 160 acre farm in upstate NY, in the Catskill mts, wheever im slow, and for as little or as long as I like.

    Very good gig, never a dull moment.

    20170723_124730.jpg

    20170602_103415.jpg

    20170602_103321.jpg

    20150501_195200.jpg

    Magical place to me. I'd come here without pay if I didn't need the money. He often comes up with quite unusual projects too.
    1990 Peterbuilt 377
    3406 B Caterpillar
    9 Speed Roadranger
    708 243 7871

  10. #30
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    Mar 2013
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    Chicago
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    Old Stuff.

    20171106_111724.jpg

    These are what's left of the tapered screws if you know how to burn them out without destroying the drum or hub. If thats what u do because they r stuck. this is after i then separated the drum from The Hub.

    I always first make an attempt by getting them out with a very low setting with an oxy acetylene tip get them glowing red then hit them with my impact on the low setting Sometimes they come. That's definitely where you would start before just jumping in it burning the heads off.

    20171106_111948.jpg

    Once u grind it flat I center punch and drill.

    20171106_113220.jpg

    20171106_122622.jpg

    Bam Finished product. The flange is very thick do not let that worry u. The screws r soft use a good new bit. Digging the left over threads out that remains is often wantin to break the tap. Use engenuity. I managed all 5 screw holes this hub without breaking drill or tap. Woho!!

    What I'm trying to convey in the pictures is the procedure u go through with the tapered screws that hold the drums to the hub. On a good day thay can be challenging and if someone prior ripped them in or they have been in a long time they don't come out.

    U can burn the heads out or drill the heads off to seporate. I burn them. The screws r quite soft. You can also expect to have to use a lot of persuasion to get the Hub and the drum part even after the screws are out. Thanks to significant rust jacking over time.

    I've already gotten to that point in the first picture.

    Some older screws r slotted throw them away for the Phillips. Do not overtighten. Once u do reinstall the drum to the hub, with all screws bottomed out, spin the drum while giving moderate blows and resnuging screws. When its seated good, back the screw out and resnug it, just barley. When u put the rim on its trapped anyway. It will prob help next time. I usually don't use any never sieze on brake stuff time and rain just wash it out but these buses see rain so infrequent I do these cause they r normally such a bitch to get out and when you consider they really don't see much rain that could be beneficial for a long time to come.

    And I might have to be the next guy to take it apart.
    Last edited by Joe Camper; 11-08-2017 at 12:12 AM.
    1990 Peterbuilt 377
    3406 B Caterpillar
    9 Speed Roadranger
    708 243 7871

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