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  1. #1
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    Cracked brake pads,

    is there ANY allowance for hairline cracks when looking at the side of brake pads?


    This is all I can find on it;



    Subpart C - Brakes

    § 393.47Brake actuators, slack adjusters, linings/pads and drums/rotors.(a) General requirements. Brake components must be constructed, installed and maintained to prevent excessive fading and grabbing. The means of attachment and physical characteristics must provide for safe and reliable stopping of the commercial motor vehicle.(b) Brake chambers. The service brake chambers and spring brake chambers on each end of an axle must be the same size.(c) Slack adjusters. The effective length of the slack adjuster on each end of an axle must be the same.(d) Linings and pads. The thickness of the brake linings or pads shall meet the applicable requirements of this paragraph—(1) Steering axle brakes. The brake lining/pad thickness on the steering axle of a truck, truck-tractor or bus shall not be less than 4.8 mm (3/16 inch) at the shoe center for a shoe with a continuous strip of lining; less than 6.4 mm (1/4 inch) at the shoe center for a shoe with two pads; or worn to the wear indicator if the lining is so marked, for air drum brakes. The steering axle brake lining/pad thickness shall not be less than 3.2 mm (1/8 inch) for air disc brakes, or 1.6 mm (1/16 inch) or less for hydraulic disc, drum and electric brakes.(2) Non-steering axle brakes. An air braked commercial motor vehicle shall not be operated with brake lining/pad thickness less than 6.4 mm (1/4 inch) or to the wear indicator if the lining is so marked (measured at the shoe center for drum brakes); or less than 3.2 mm (1/8inch) for disc brakes. Hydraulic or electric braked commercial motor vehicles shall not be operated with a lining/pad thickness less than 1.6 mm (1/16 inch) (measured at the shoe center) for disc or drum brakes.(e) Clamp and roto-chamber brake actuator readjustment limits. The pushrod travel for clamp and roto-chamber type actuators must be less than 80 percent of the rated strokes listed in SAE J1817—Long Stroke Air Brake Actuator Marking, July 2001 (See § 393.7 (b)for information on incorporation by reference and availability of this document), or 80 percent of the rated stroke marked on the brake chamber by the chamber manufacturer, or the readjustment limit marked on the brake chamber by the chamber manufacturer. The pushrod travel for Type 16 and 20 long stroke clamp type brake actuators must be less than 51 mm (2 inches) or 80 percent of the rated stroke marked on the brake chamber by the chamber manufacturer, or the readjustment limit marked on the brake chamber by the chamber manufacturer.(f) Wedge brake adjustment. The movement of the scribe mark on the lining shall not exceed 1.6 mm (1/16 inch).(g) Drums and rotors. The thickness of the drums or rotors shall not be less than the limits established by the brake drum or rotor manufacturer.
    [70 FR 48051, Aug. 15, 2005]



  2. #2
    Road Train Member bender's Avatar
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    Hairline cracks are not condemned until they become missing pieces of lining. Regularly scheduled maintenance inspections can catch them before they get to that point.

  3. #3
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    In section 570 there is mention of not allowing brake shoe cracks that extend to the rivets/holes.

  4. #4
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    Quote Originally Posted by bender View Post
    Hairline cracks are not condemned until they become missing pieces of lining. Regularly scheduled maintenance inspections can catch them before they get to that point.

    Thanks, just curious, had one of my NEW trucks insp. yesterday, got a cit/warning for one cracked pad. This truck has 120,000 all interstate miles on it and has about 90% of it's lining left. On top of that Freightliner just DOT'ed it a month ago.

    I think I might raise a little hell with Freightliner, for as lite as we are these brakes NEVER get abused.

  5. #5
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    Quote Originally Posted by Hardlyevr View Post
    In section 570 there is mention of not allowing brake shoe cracks that extend to the rivets/holes.
    To be honest Hardlyevr, this crack is running longways following the arch in the shoe, it is not a crack across the face of the shoe. I will have that truck back here tom. and take it apart, but I'm thinking that from looking at it from the top of the pad side you will not even see a crack.

    It's about 1" long and literally a hairline, they insp. the whole truck, a 2010 and the trailer a two month old 2013 and failed him because of this. I have seen pads in the past cracked across the face and lose parts of the lining, that isn't what this looks like.

  6. #6
    Light Load Member YETI1's Avatar
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    curious what location did the inspect? a pic would be cool! Ive pulled brakes that looked terrible off but looked fine for an inspection...

  7. #7
    Road Train Member bender's Avatar
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    Quote Originally Posted by KANSAS TRANSIT View Post
    Thanks, just curious, had one of my NEW trucks insp. yesterday, got a cit/warning for one cracked pad. This truck has 120,000 all interstate miles on it and has about 90% of it's lining left. On top of that Freightliner just DOT'ed it a month ago.

    I think I might raise a little hell with Freightliner, for as lite as we are these brakes NEVER get abused.
    Freightliner did right, the DOT did the wrong. It's very common (almost the norm) to see that type of cracks on the exposed edge of the lining. Talk to a brake supplier, they'll tell you it's normal and not of concern until you are faced with an uninformed DOT inspector.

    How many DOT officers pull wheels and drum to evaluate the extent of cracks to a rivet hole? The answer is none. But if pieces of lining are missing, they can clearly see without disassembly.

  8. #8
    Road Train Member bender's Avatar
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    Quote Originally Posted by KANSAS TRANSIT View Post
    To be honest Hardlyevr, this crack is running longways following the arch in the shoe, it is not a crack across the face of the shoe. I will have that truck back here tom. and take it apart, but I'm thinking that from looking at it from the top of the pad side you will not even see a crack.

    It's about 1" long and literally a hairline, they insp. the whole truck, a 2010 and the trailer a two month old 2013 and failed him because of this. I have seen pads in the past cracked across the face and lose parts of the lining, that isn't what this looks like.
    I wouldn't bother taking it apart on account of those goofballs, but it's your truck. Just my opinion.

  9. #9
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    Quote Originally Posted by bender View Post
    I wouldn't bother taking it apart on account of those goofballs, but it's your truck. Just my opinion.

    Well, I have to sign there repair ticket and send it back, so I will at least take it apart a look at it, BUT I will get some pics of it and post them here.

    I'm not ####### (well, I guess I am) but over the last two years we have bought new trucks and are now going thru and replacing all of our 2005 trailers, we have also within the last two months replaced ALL of our securement equipment, chains, ratchets, straps, etc.

    We have spent more money in the last two years than we have in this companies 20 year history trying to "play by the rules" and make DOT happy.

    But in the last six months we have been getting hit with some pretty petty crap, I can honestly tell you that ALL of our equipment is in better, new or nearly new condition, then it has ever been.

    I was TRYING TO AVOID THIS CRAP!!!

  10. #10
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    Quote Originally Posted by YETI1 View Post
    curious what location did the inspect? a pic would be cool! Ive pulled brakes that looked terrible off but looked fine for an inspection...



    It was Madison,Il. I-55/I-70

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