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GMC brakes repair questions and answers

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  • mike
    mike - 1998 GMC K1500 Suburban - Brakes - 2/3/2012
    I'd like a step by step along with some visual aids if possible on replacing my wheel cylinders and rear brakes.
    here's the deal. I just installed a 1977 14 bolt gm rear end on my 98' pickup after some modifications of course. I am not familiar with the full floating axle. A friend told me i have to remove the axlein order to take the drum off. What steps will i need to follow ...
     
    0 answer
  • smarshall
    smarshall - 2002 GMC Yukon Denali XL - Brakes - 2/1/2012
    Brakes pulsate when applied
    When I apply brake it makes a pulsating sound
     
    • Spoon Sports
      2/1/2012 Spoon Sports
      A pulsating brake pedal, which may be accompanied by a shuddering or jerky stop during normal braking, usually means a warped rotor or an out-of-round drum although it can sometimes be caused by loose wheel bearings, a bent axle shaft or loose brake parts. If the vehicle is equipped with ABS, however, some pedal feedback and noise is normal during panic stops or when braking on wet or slick surfaces. But you should not experience any ABS pedal feedback when braking normally on dry pavement.

      The faces of a disc brake rotor must be parallel (within .0005 inch on most cars) and flat (no more than about .002 to .005 inches of runout) otherwise it will kick the brake pads in and out when the brakes are applied, producing a pulsation or vibration that can be felt in the brake pedal as the rotor alternately grabs and slips.

      You can often see warpage in a brake rotor by simply looking at it. If the rotor has telltale glazed or discolored patches on its face, chances are it is warped. Measuring it with a dial indicator and checking it for flatness with a straight edge will confirm the diagnosis.

      Resurfacing the rotor to restore the faces will usually eliminate the pulsation (unless the rotor is bent or is badly worn and has started to collapse in which case the rotor must be replaced). But it may only do so temporarily because of metallurgical changes that take place in the rotor. Hard spots often extend below the surface of the rotor. Resurfacing will restore the surface, but the hard spot may reappear again in a few thousand miles as the rotor wears. For this reason, GM and others recommend replacing warped rotors rather than resurfacing them.

      Pedal pulsation caused by drum warpage isn't as common, but it can happen. A drum can sometimes be warped out-of-round by applying the parking brake when the brakes are hot. As the drum cools, the force of the shoes causes the drum to distort.

      What causes a rotor to warp? Overtorquing or unevenly torquing the lug nuts with an impact wrench is a common cause. For this reason, most experts recommend using a torque wrench to tighten lug nuts when changing a wheel. There are also special torque-limiting extension sockets called "Torque Sticks" that can be safely used with an impact wrench to accurately tighten lug nuts. But a plain impact wrench should never be used for the final tightening of the lug nuts because most provide no control whatsoever over the amount of torque applied to the nuts.

      Overheating can also cause rotors to warp. Overheating may be the result of severe abuse or dragging brakes. Defects in the rotor casting, such as thick and thin areas can also cause uneven cooling that leads to warpage. Hard spots in the metal due to casting impurities can be yet another cause.

  • owatkins44
    owatkins44 - 1995 GMC Jimmy - Brakes - 2/1/2012
    Rear brake drums 1968 gmc 1/2 ton truck
    i have a 1968 gmc c1500 that need rear brake drum the rear drum are difference than the front drum front drum will not fit the rear. the drums on the rear are deeper because the axle stick out a little does any one know where i can the rear drum dealer does not ...
     
    • CVO
      2/1/2012 CVO
      CVO
      2/1/2012 owatkins44
      thanks they dont have a drum will fit that 60 dana
      CVO
      2/2/2012 CVO
      www.rockauto.com

      Go to our Interactive Catalog for more cool features
      Look for a part:
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      1968 : GMC : C15/C1500 PICKUP
      3.8L 230cid L6
      4.1L 250cid L6
      4.8L 292cid L6
      5.0L 305cid V6
      5.0L 307cid V8
      5.4L 327cid V8
      5.7L 351cid V6
      6.5L 396cid V8
      What's the vehicle engine displacement ?
  • Brandon
     
    • Spoon Sports
      1/17/2012 Spoon Sports

      Your brake pads may need replacing, the disc or drum may be warped or cracked, the caliper may need replacing, especially if there is metal on metal friction.
      Floating caliper (single piston) designs are subject to failure due to sticking which can occur due to dirt or corrosion if the vehicle is not operated regularly. This can cause the pad attached to the caliper to rub on the disc when the brake is released. This can reduce fuel effiency and cause excessive wear on the affected pad. Additional heat generated by the constantly rubbing pad can lead to warping of the disc also.
      Spoon Sports
      1/18/2012 Brandon
      Thank you
    • HouseCallAuto
      1/17/2012 HouseCallAuto
      Remove the self-adjuster / star-wheel adjuster, separate the two halves where it is threaded and put a tiny amount of anti-seize compound on the threads and make sure that there is an "L" stamped into the end of the adjuster when you remove the end cap indicating left side.
      HouseCallAuto
      1/17/2012 HouseCallAuto
      Mske sure that the hole where you adjust the brakes with a spoon has the rubber plug installed in it to prevent road salt from intruding right to the adjuster.
      HouseCallAuto
      1/18/2012 Brandon
      Thank you
  • MIGUEL
    MIGUEL - 2006 GMC Canyon - Brakes - 1/16/2012
    Im wondering why My truck is jumpy while it's on on park gear or on pressing the brake?
    It seems as if the truck feels heavier and as if want to accelerate on it's own
     
    0 answer
  • avecchio
    avecchio - 2000 GMC Sierra 1500 - Brakes - 1/16/2012
    What are Torque specs for front wheel bearing hub assembly & brakes
    Does anyone know where i can download specs for free online
     
  • Dan
    Dan - 2003 GMC Yukon - Brakes - 1/14/2012
    What is a fair price to repair leaky brake line
    Brake pedal went to the floor. I checked the brake fluid and it was low. What is a fair price to repair the leaking brake line
     
    • CVO
      1/14/2012 CVO
      Those two links below are for the repair quotes and negotiations.

      1.Visit this link... http://www.automd.com/repaircost/ , fill in all the data required and get the quotes.

      2.This link, AutoMD will help you to negotiate with the local auto repair shops for a reasonable prices.

      http://www.automd.com/negotiator/
    • HouseCallAuto
      1/14/2012 HouseCallAuto
      The word fair is vague and subjective. Repair costs are tied to the amount of hours or parts of an hour times the shop hourly labor rate. A typical rate is $80 an hour plus parts needed. A 3 hour repair is $240 plus parts.
  • bgfoote
    bgfoote - 2006 GMC Sierra 1500 - Brakes - 1/9/2012
    Front brakes are hannging up
    i have replaced bouth hubs and rotors and, wheel sesoprs, calipers, and pads. there are no codes and blead the brake system
     
    • don
      1/9/2012 don
      sounds like your power booster in starting to go out . try to pull up on the brake pedal see if your brakes release???? if so write back and tell me..............
      don
      1/9/2012 bgfoote
      ok i will try that and let you know the out come thanks don
      don
      1/15/2012 bgfoote
      ok well i did that and still have the problem....
  • Vinny
    Vinny - 2001 GMC Yukon - Brakes - 1/8/2012
    2001 Yukon SLT,5.3L is limited slip axle or non limited slip axle?
    I'm about to get front and rear brake disc,but I was told to make sure if my car is with limited slip axle/differential or non limited axle/differential
     
    • Jay Giron
      1/8/2012 Jay Giron
      A limited slip differential (the gears in the rear end, not the transmission) has clutches that distribute power evenly to both wheels, limiting the amout of wheel spin.

      An open differntial (non- limited slip) has fewer moving parts. It sends power the the wheel with the least resistance. As long as you don't spin your tires, (drag racing, snow, mud) an open differential is perfectly functional and less prone to noise and failure in the long run.
  • DJS
    DJS - 2002 GMC Envoy - Brakes - 1/1/2012
    I have a squael coming out of the A M side of my radio when I step on my brakes.
    Taken it to a number of service shops and they don;t have an answer or want to charge way to much to look at it.
     
    0 answer
  • Logjam
    Logjam - 2007 GMC Sierra 1500 - Brakes - 1/1/2012
    I'd like to improve braking while towing my travel trailer. Should I install slotted rotors? What type of brake pads sho
    My trailer weighs 6700Lb fully loaded.
     
    • Dave
      12/31/2011 Dave
      Trailer brakes
      Dave
      1/1/2012 Logjam
      These stupid answers really burn me up. As if I don't have the basics. Look nerds, I just need to know if I can expect better performance from slotted rotors or different composition brake pads.
      Dave
      1/1/2012 Dave
      I have a fithwheel camper that I tow on vacations. I set the trailer brake actuator to stop my f250 and my trailer. It's the best way. I think u can add the electic brakes to the camper. I also have several work trucks with toolbeds on them that are very heavy. We r constantly doing brake jobs. Yes, The
      Larger slotted rotors with oversized calipers will help.
    • Jimm
      1/1/2012 Jimm
      Logjam -why the poor attitude? You asked for help - you got it. Just because you don't like the answers....
      The advise is sound - go the the place where the trailer hitch is installed. The improved braking performance may be relaized by either different brake pad formulation and slotted rotors - for cooling.
      But the best source of information would be the trailering experts.
      Jimm
      1/1/2012 Logjam
      look, the trailer hitch etc were factory installed as was the trailer brakeing unit. I never said anything about U-haul, it's just that I don't appreciate answers from a professional site, by unprofessional people. Thanks for the constructive answers, all are appreciated. Just don't tell me to go to the hospital where my baby was born to get an answer about teen-age masturbation ok!
    • CVO
      12/31/2011 CVO
      Call local U-Haul ( your moving and storage resource ) to have an accurate answer.

      Note : they provided and installed the trailer hitches.
  • Clark Myers
    Clark Myers - 2006 GMC Canyon - Brakes - 12/27/2011
    Front Break Disks are Cracked and Rear Drums are Warped.
    I bought this truck 3 years ago with 26000 miles on it. With-in a year the front disks were showing signs of cracking. I have replaced the front and rear pads twice in the 3 years. I know that I need to replace the brakes but I am concerned that OEM brakes are ...
     
    • don
      12/27/2011 don
      yes upgrade rotors; raybest, and drum brake stop tracker trailer. do you have a trailer brake on your trailer? if not i would get one........................
      don
      12/27/2011 Clark Myers
      The boat ant trailer are 25 years old and there are no brakes. I looked into adding trailer brakes about 18 months ago but found that there are no flanges on the axle or frame which would allow mounting of calipers. I would have to buy a whole new axle in order to add brakes (about $1000 for the axle and another $1200 for the trailer brakes).
      don
      4/21/2013 frankiedonnn
      It may be more cost effective to buy a new trailer with brakes.
  • mikey29483
     
    • CVO
      12/26/2011 CVO
      1. Disc rotors, brake pads, brake shoes ( some models may still use it, if the hardware such as springs are too rusty, replace them ) and Permatex disc brake quiet to avoid the squealing.Visit this site and see the Permatex. Local auto stores have those in stock.

      http://www.amazon.com/s/ref=nb_sb_ss_i_9_5

      2. Visit this link and see the instructions to perform the repair.

      http://www.autozone.com/.../...rGuideContent.jsp
    • ARMY OF 4 TIRES
      12/26/2011 ARMY OF 4 TIRES
      If you got to Autozone theyll help you get everything you need, if you do replace the rotors youll be doing your wheel bearings too as they use rotor hub assemblies, and among the stuff CVO mentioned youll need brake and caliper grease, and most likely the caliper pins and boots will need replaced if you have to replace the rotors
      ARMY OF 4 TIRES
      12/26/2011 ARMY OF 4 TIRES
      oh and brake cleaner, I went through two cans for front brakes and wheel bearings
 
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