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  • #1

    Front brake wobble

    I have a front brake wobble under hard brakeing. Someone on here told me to check the rotor retaining bolts, and yes, one is slightly bent He said to just replace them with new from a hardware store. I don't want to take chances with my brakes Anyone know if I need "special" bolts for my Special
    1979 XS1100 Special (Mad Max, OEM) Current
    1980 XS1100 Special
    1990 V Max
    1982 KZ750 LTD Twin
    1986 700 FZR Yamaha Fazer (faster then expected)
    1979 XS750 Special (my 1st Special)
    1974 CB750-Four



    Past/pres Car's
    1961 Catalina 389/1970 Torino GT 351/1967GTO 12to1 comp./ Roller cam/ T-10/ 456 gear/Tri-power/1967 GTO 400, 1969 Camaro, 1968 Z28, 2001 BMW M Roadster 0 to 60 in 4.5 sec. Jaguar XK8
    Tags: None
  • #2
    There's nothing 'special' about that bolt as far as strength goes. Any better 'graded' bolt will work...
    Fast, Cheap, Reliable... Pick any two

    '78E original owner - resto project
    '78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
    '82 XJ rebuild project
    '80SG restified, red SOLD
    '79F parts...
    '81H more parts...

    Other current bikes:
    '93 XL1200 Anniversary Sportster 85RWHP
    '86 XL883/1200 Chopper
    '82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
    Cage: '13 Mustang GT/CS with a few 'custom' touches
    Yep, can't leave nuthin' alone...

    Comment

    • #3
      Thanks

      Thanks CS, didn't know if it would be worth the time to track down a grade 8 or some such.
      Originally posted by crazy steve View Post
      There's nothing 'special' about that bolt as far as strength goes. Any better 'graded' bolt will work...
      1979 XS1100 Special (Mad Max, OEM) Current
      1980 XS1100 Special
      1990 V Max
      1982 KZ750 LTD Twin
      1986 700 FZR Yamaha Fazer (faster then expected)
      1979 XS750 Special (my 1st Special)
      1974 CB750-Four



      Past/pres Car's
      1961 Catalina 389/1970 Torino GT 351/1967GTO 12to1 comp./ Roller cam/ T-10/ 456 gear/Tri-power/1967 GTO 400, 1969 Camaro, 1968 Z28, 2001 BMW M Roadster 0 to 60 in 4.5 sec. Jaguar XK8

      Comment

      • #4
        I had the same problem, and did end up throwing a grade 8 in there, but only because that's what they had at the parts store . Cost about $2, I think. Also probably overkill for the load put on those bolts!

        I just took the old one in and they let me go in the back and match it up. It was either Advance Auto or AutoZone, one of the larger chains. I'm sure you can find it at any bolt-selling-retailer
        XS11SH :: K&N Pods, 4->1, Dynojet kit, Barnett clutch springs, TC's fuse block, ATGATT

        Well, goodness. Look what we've got here.

        Comment

        • #5
          Two$

          Two $, at that price I will get them, I haven't looked and didn't know that grade 8 would be that easy to find in metric / size. Thanks
          Originally posted by Danny Crawdad View Post
          I had the same problem, and did end up throwing a grade 8 in there, but only because that's what they had at the parts store . Cost about $2, I think. Also probably overkill for the load put on those bolts!

          I just took the old one in and they let me go in the back and match it up. It was either Advance Auto or AutoZone, one of the larger chains. I'm sure you can find it at any bolt-selling-retailer
          1979 XS1100 Special (Mad Max, OEM) Current
          1980 XS1100 Special
          1990 V Max
          1982 KZ750 LTD Twin
          1986 700 FZR Yamaha Fazer (faster then expected)
          1979 XS750 Special (my 1st Special)
          1974 CB750-Four



          Past/pres Car's
          1961 Catalina 389/1970 Torino GT 351/1967GTO 12to1 comp./ Roller cam/ T-10/ 456 gear/Tri-power/1967 GTO 400, 1969 Camaro, 1968 Z28, 2001 BMW M Roadster 0 to 60 in 4.5 sec. Jaguar XK8

          Comment

          • #6
            Good choice on the grade8 bolt. Any pieces attached relating to suspension, braking or steering uses grade8 fasteners. That includes attached bumpers on cages. For safety reasons, that is DOT regulations. A good thing to remember if in question as to what grade of fastener to use depending on its location.
            81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

            Comment

            • #7
              Originally posted by motoman View Post
              ..Any pieces attached relating to suspension, braking or steering uses grade 8 fasteners..
              That's not neccesarily true.... most will be grade 8, but not all. One thing the off-roaders have found out is the grade 8 bolts won't take the shock loads and they break, while a grade 5 will deform before breaking. I do remember from my mechanic days that most shock hardware was grade 5 for just that reason. The fact that the OEM bolt will bend tells me that it wasn't any better than grade 5 to start with...
              Fast, Cheap, Reliable... Pick any two

              '78E original owner - resto project
              '78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
              '82 XJ rebuild project
              '80SG restified, red SOLD
              '79F parts...
              '81H more parts...

              Other current bikes:
              '93 XL1200 Anniversary Sportster 85RWHP
              '86 XL883/1200 Chopper
              '82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
              Cage: '13 Mustang GT/CS with a few 'custom' touches
              Yep, can't leave nuthin' alone...

              Comment

              • #8
                Originally posted by crazy steve View Post
                That's not neccesarily true.... most will be grade 8, but not all. One thing the off-roaders have found out is the grade 8 bolts won't take the shock loads and they break, while a grade 5 will deform before breaking. I do remember from my mechanic days that most shock hardware was grade 5 for just that reason. The fact that the OEM bolt will bend tells me that it wasn't any better than grade 5 to start with...
                +1, The higher the grade the more likely it is that the fastener with snap rather than bend. But I replaced my rotor bolts with stainless bolts so I am screwed anyways.
                Nathan
                KD9ARL

                μολὼν λαβέ

                1978 XS1100E
                K&N Filter
                #45 pilot Jet, #137.5 Main Jet
                OEM Exhaust
                ATK Fork Brace
                LED Dash lights
                Ammeter, Oil Pressure, Oil Temp, and Volt Meters
                Green Monster Coils
                SS Brake Lines
                Vision 550 Auto Tensioner

                In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

                Theodore Roosevelt

                Comment

                • #9
                  I found that Lowe's has a good selection of metric sized bolts.
                  1979 XS1100

                  Comment

                  • #10
                    Watch your grades!

                    Hi Guys,
                    SAE Grade 5 is best for fasteners that need toughness ahead of high strength, SAE Grade 8 has a higher tensile strength but it'll snap before it bends. Note that SAE grades only apply to inch-sized fasteners.
                    The Metric equivalent to SAE Grade 5 is Grade 8.8 and it's plainly marked on the bolt head.
                    Fred Hill, S'toon
                    XS11SG with Spirit of America sidecar
                    "The Flying Pumpkin"

                    Comment

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