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CDL Test question on brakes

Discussion in 'Questions From New Drivers' started by Truck4Fun, Oct 27, 2013.

Page 2 of 3
  1. Oct 27, 2013 #11
    Truck4Fun

    Truck4Fun Bobtail Member

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    Oct 6, 2013
    Pasadena, Calif
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    This really makes sense because I've noticed other places in CDL guide where brakes are referenced generically. Thanks.
     
    Truck4Fun, Oct 27, 2013
    Truck4Fun, Oct 27, 2013
    #11
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  3. Oct 27, 2013 #12
    Truck4Fun

    Truck4Fun Bobtail Member

    27
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    Oct 6, 2013
    Pasadena, Calif
    0
    As a newbie, I'm really enjoying the smart way these truck systems are designed. There's more to it than meets the eye.

    Appreciate the responses from so many sharp folks. This forum is a real treasure!

    Thanks again,

    Mark
     
    Truck4Fun, Oct 27, 2013
    Truck4Fun, Oct 27, 2013
    #12
  4. Oct 27, 2013 #13
    379exhd

    379exhd Road Train Member

    2,925
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    Jun 25, 2012
    rolling through hell
    0
    Don't set them ####### when right away in the winter either after you get off the road. Them shoes will freeze to that drum by morning and then you get to buy a 3lb hammer and beat like a SOB for about 45 minutes to get them unstuck...don't ask me how I know this.
     
    379exhd, Oct 27, 2013
    379exhd, Oct 27, 2013
    #13
    DoneYourWay Thanks this.
  5. Oct 27, 2013 #14
    Skan

    Skan Light Load Member

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    May 12, 2013
    Cambridge, ON
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    You are using the exact same braking surfaces and friction surfaces between the service application and the parking application. In fact, the spring that applies the parking brake is mounted in a second chamber behind the service chamber. This differs from automobiles to some extent that some manufacturers in a 4 wheel disc system, will employ a drum/disc on the rear brakes so you have a disc brake setup for all service applications and the standard drum assembly for the parking brake. We don't employ that type of system in heavy vehicles which is why you will not have parking brakes if you have no service brakes.
     
    Skan, Oct 27, 2013
    Skan, Oct 27, 2013
    #14
    DoneYourWay and Truck4Fun Thank this.
  7. Oct 27, 2013 #15
    Passin Thru

    Passin Thru Road Train Member

    1,918
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    Mar 8, 2007
    VA
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    379exd has been to Colorado too! YUP! YUP! Had it happen in the San Louis Valley more than once, one time at the fuel pump and the guy standing there screaming all the time so I got out a flare and he went back inside.
     
    Passin Thru, Oct 27, 2013
    Passin Thru, Oct 27, 2013
    #15
  8. Oct 27, 2013 #16
    jbee

    jbee Medium Load Member

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    Jun 3, 2011
    NC
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    Didn't miss the point at all. It's the way he worded his question.
     
    jbee, Oct 27, 2013
    jbee, Oct 27, 2013
    #16
  9. Oct 28, 2013 #17
    25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    the road less travelled
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    I should have added to my answer ,"and could cause damage, sometimes serious." Exploding brake drums aren't funny or fun.
     
    25(2)+2, Oct 28, 2013
    25(2)+2, Oct 28, 2013
    #17
  10. Oct 28, 2013 #18
    ZVar

    ZVar Road Train Member

    10,911
    23,832
    Sep 10, 2010
    Flint, MI
    0
    Yea, but, in a controlled environment, it would be awesome to see!

    - Steven
     
    ZVar, Oct 28, 2013
    ZVar, Oct 28, 2013
    #18
  11. Oct 28, 2013 #19
    KW Cajun

    KW Cajun Road Train Member

    2,383
    3,652
    Apr 12, 2013
    Copperhead Road
    0
    Had one of those brake drum grenades go off on me a couple months ago.
    Picked up a 53' with supersingles from Chicago, got about 1.5 hrs west and the right front drum on trailer went MIA in chunks of shrapnel.
    Only thing left was the drum's faceplate between hub & wheel. Supersingle had big holes torn thru it.
    All other kinds of associated damage (RR chamber, brake hose, trailer floor, etc).
    Expensive (not on my $)... but not pretty.
     
    KW Cajun, Oct 28, 2013
    KW Cajun, Oct 28, 2013
    #19
    DoneYourWay and 25(2)+2 Thank this.
  12. Oct 28, 2013 #20
    Truck4Fun

    Truck4Fun Bobtail Member

    27
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    Oct 6, 2013
    Pasadena, Calif
    0
    A number of people did miss the point.

    If someone was just reading the last line of my question or if they didn't really understand how truck braking systems work then they could say that parking brakes are not used when coming down a hill. But that DOES miss the point.

    The point was to answer why parking brakes should not be used after service brakes get heated after coming down a steep grade. The answer, as heyns57 pointed out, was that because brakes share the same components, when service brakes get heated even the parking brakes (because of shared components) are also heated.

    Obviously, everyone's trying to help out. But heyns57 and KW Cajun (along with a few others) provided answers WITH explanations and experience. It really helps move newbies, like me, forward and do more than memorize test answers. If we understand how the trucking systems really work then we'll be better drivers. Ultimately, I think that's the bigger point.
     
    Truck4Fun, Oct 28, 2013
    Truck4Fun, Oct 28, 2013
    #20
    heyns57, KW Cajun and 25(2)+2 Thank this.
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