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Brake Caliber bolts

Discussion in 'General Chevy & GM Tech Questions' started by Mike805, Feb 21, 2009.

  1. Mike805

    Mike805 New Member

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    Its time to change brake pads on my 01 Chevy Silverado Z71.

    Heres the problem, the brake caliber bolts wont break free when trying to loosen. Ive already stripped one bolt.

    So whats the trick of getting out the stripped bolt and getting the others out to change brake pads.
    Never had this problem of changing brake pads before.
    #1
  2. dwill3015

    dwill3015 New Member

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    Welcome to the site! I would suggest penetrating oil, or heat to break it loose. We'll see what other members recommend as well.
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  3. thatjerk01

    thatjerk01 New Member

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    i would say use penetrating oil. spray it let it sit a min or two then spray it again. u gotta let the stuff work.
    #3
  4. spyder2000

    spyder2000 New Member

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    When you write 'stripped' do you mean the bolt came out in one piece but the threads are damaged? Or did the bolt break off in the caliper hanger?

    I've never had either of these happen. The bolts are tight but should never be that tight. If they seem to be so, be sure you are turning them in the right direction since you are loosening them from the back of the bolt.

    For those that remain, try a penetrating oil like PB Blaster (there are others) shot between the disc and the caliper hanger to get to the hole. Give it 15 minutes to work, then try to release the bolt. If that doesn't give, then try heat from a propane torch.

    If the bolt broke off in the hanger, you will have to remove the disc (and bearings) to access the hole in the caliper hanger to drill and easy out the remainder. Penetrating oil and heat is used here as well.

    Not a bad idea to remove those bolts every year or so when you inspect brakes, clean them up with solvent to free the sleeves, then lubricate them well with high temp silicone grease and reinstall. This is also what allows the caliper to slide freely.
    #4
  5. cascott325

    cascott325 New Member

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    lefty loosey, righty tighty! lol
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  6. Z71_guy

    Z71_guy New Member

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    if you stripped the head of the bolt get a two vise grips, put one on the stripped bolt head and use the other to tighten the vise grip as tight as you can go then try to break it loose that way( use penetrating oil first)

    I use this method to get out stripped oil drain pugs
    #6
  7. FireRed

    FireRed New Member

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    Always use heat to soften the "Loc Tite" !! Many get crazy over tightening them they should be torqued to 25lbs using lock tight. If in fact you have ruined the threads go to any decent auto supply and buy replacement bolts for stripped threads they will cut a new thread and save the day.

    Phil
    #7
  8. Mike805

    Mike805 New Member

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    Thanks everyone for the replys.

    After working four hours straight I finally got all four caliber bolts out. Everyone of them I had to heat, beat, spray. I never had such a time with brakes in all my life.

    I had to buy4 new caliber bolts. Cause the only way I could get these suckers out was putting vise grips on the bolt by the rubber seal and beating with hammer while heating with flame. Who ever worked on these brakes before must of used supper glue instead of lock tight.

    At lease the new caliber bolts have bolt heads instead of those dam star crap heads.

    The front brakes are all done and after I rest up and calm down I will tackle the rears.
    #8
  9. CarpenterGuy

    CarpenterGuy New Member

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    oh man i hate those "torx" bolts or what ever they're called. my grandpa had those on his '90 gmc safari when i did the brakes on it. it was stupid. he blew up the engine like 4 months after that too. he said he had the oil changed that day so i didn't check it. i probobly shoulda looked any way. i hate it when people take advantage of old folks
    #9
  10. bzboardco

    bzboardco New Member

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    One Suggestion----I just recently did that to my 02 silverado those torx bolts were hell and once removed I took a bolt to a hardware store and bought 4 hardened bolts (black ones) with 21 mm heads the next time it will be easier....Just my 2 cents

    MAKE SURE YOU USE LOC TITE AGAIN i LOST ONE OF MY REAR BOLTS ABOUT 2 DAYS LATER AFTER CHANGING THEM AND THE FRONT WAS STARTING TO LOOSEN
    #10
  11. Z71_guy

    Z71_guy New Member

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    I dont know how you guys are tightening the bolts but i have never had one come loose and never used lock tite just slam them down with the air racket and and give it a good extra snug
    #11
  12. Tunnelmotor99

    Tunnelmotor99 New Member

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    You guys are scaring me suggesting using a propane torch on the calipers! If you do that, you seriously risk scorching the brake fluid inside the caliper, melting the dust boot around the pistons and the brake hose!
    Loctite is ok, but DO NOT use the red or next brake job you will have the same problem again. Use either the blue or green. Personally, I have never used any loctite, just snug the bolts down good...that will suffice! I've done close to 300 brake jobs and have never used any loctite...never had any comebacks for loose caliper bolts either!
    #12
  13. Mike805

    Mike805 New Member

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    Never used the stuff on any brakes before either and never will. Didn't have a choice in using the torch. Those bolts would not break loose. I was careful on putting the flame around the area that held the bolt head.
    Thank goodness I didnt have any problems with the back brakes when I changed them. They had
    regular bolt heads not those dang star bolts.
    #13
  14. bd1326

    bd1326 New Member

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    on my '99 silverado, the first brake job i did i ran into a problem right off the bat. the guy that had it before me for some reason decided to spot weld one of the bolts in place. needless to say i ended having to replace the caliper hanger. the only way to do that was to buy load calipers which ended up being easier than grinding and drilling out the bolt
    #14

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