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Do I need to change disk brake rotor after suspension oil spilled on it?

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  • #1

    Do I need to change disk brake rotor after suspension oil spilled on it?

    Hi,
    I have had a leaked front fork seal on my pulsar 180 UG4 many years back. At that time, the suspension oil was spilled on disk as well as pads. I kept riding the bike for a couple of thousands of KM. Front brake obviously lost its bite. After getting the seal fixed, I have changed the brake pads twice and washed the disk a countless times. Everything has been changed except the disk itself.

    After that leaking incident, that signature pulsar front disk bit never returned. Even today I have to exert some force to get the bike to stand still with just the front brakes. It's no more pinky finger operation.

    So my question is, even though the disk rotor looks like any other pulsar disk rotor, do I need to change it too to get that proper braking?
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  • #2
    Re: Do I need to change disk brake rotor after suspension oil spilled on it?

    Query Approved

    1. There is no reason that oil spilled on the disc will have anything to do with the braking after two years.

    2. The Pulsars do not have one finger braking! Brakes are good but not exceptional. Great braking is found on the Dukes.

    3. When was the last time you changed the brake fluid? You might need to bleed the brakes as well, if there is a spongy feeling to it.
    Biking is not about what you have between your legs, its all about how well you use it!!!!!!!

    Give your details here if you want to help your fellow xBhpian stranded in your city

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    • #3
      Re: Do I need to change disk brake rotor after suspension oil spilled on it?

      Originally posted by The Monk View Post
      Query Approved

      1. There is no reason that oil spilled on the disc will have anything to do with the braking after two years.

      2. The Pulsars do not have one finger braking! Brakes are good but not exceptional. Great braking is found on the Dukes.

      3. When was the last time you changed the brake fluid? You might need to bleed the brakes as well, if there is a spongy feeling to it.
      sir please tell me after how many kms i need to get the tappet of my bike tightened?

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      • #4
        Re: Do I need to change disk brake rotor after suspension oil spilled on it?

        Originally posted by The Monk View Post
        Query Approved

        1. There is no reason that oil spilled on the disc will have anything to do with the braking after two years.

        2. The Pulsars do not have one finger braking! Brakes are good but not exceptional. Great braking is found on the Dukes.

        3. When was the last time you changed the brake fluid? You might need to bleed the brakes as well, if there is a spongy feeling to it.
        I changed the brake fluid twice same time with the pads. Everything consumable about front brake has been changed except the disk. There's immense difference in braking between my bike and any other P180. Front brake isn't effortless like other P180.

        I think, when I left the suspension oil on the disk for long time, it grinded the disk smooth. Does that happen?
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        • #5
          Re: Do I need to change disk brake rotor after suspension oil spilled on it?

          Originally posted by lockhrt999 View Post
          I changed the brake fluid twice same time with the pads. Everything consumable about front brake has been changed except the disk. There's immense difference in braking between my bike and any other P180. Front brake isn't effortless like other P180.

          I think, when I left the suspension oil on the disk for long time, it grinded the disk smooth. Does that happen?
          Hope the brake pads have not retained any of the spilled fluid. (or did you change the disc pads After this incident?)
          Hope you cleaned the heck out of the disc after this incident with an appropriate brush and solvent.
          *dont mind me saying this, Hope you follow correct braking habits, other wise riding the brake for too long will also present similar issues.
          And last but not least, The Disc Can actually grind to smoothness, but then think about it, at that level of Grinding, without any new oil being introduced over the surface, the existing oil will burn out by heat and the disc will operate again without any oil and again get regular wear pattern due to the brake pads. But i doubt that is the case here

          Also check tyre health, even this can affect braking.

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          • #6
            Re: Do I need to change disk brake rotor after suspension oil spilled on it?

            Is the front fork fine? If different quantities of oil were filled in, then your braking is bound to suffer dramatically. And no matter what amount of repairing you do to the brakes, its not going to help.
            Biking is not about what you have between your legs, its all about how well you use it!!!!!!!

            Give your details here if you want to help your fellow xBhpian stranded in your city

            Touring Blog: Cycling in Mongolia!

            Comment

            • #7
              Re: Do I need to change disk brake rotor after suspension oil spilled on it?

              Originally posted by rugved View Post
              Hope the brake pads have not retained any of the spilled fluid. (or did you change the disc pads After this incident?)
              Hope you cleaned the heck out of the disc after this incident with an appropriate brush and solvent.
              Yes I changed the pads and also disk was washed with alcohol then diesel then a pressure wash.

              Originally posted by rugved View Post
              *dont mind me saying this, Hope you follow correct braking habits, other wise riding the brake for too long will also present similar issues.
              And last but not least, The Disc Can actually grind to smoothness, but then think about it, at that level of Grinding, without any new oil being introduced over the surface, the existing oil will burn out by heat and the disc will operate again without any oil and again get regular wear pattern due to the brake pads. But i doubt that is the case here

              Also check tyre health, even this can affect braking.
              Oil kept leaking over a month. Those were muddy days of monsoon. I didn't realize the oil leakage for I don't how long. Bike was extremely muddy. Ever after realizing the leak I kept riding for a few more weeks. I fixed the seal and replaced the suspension oil, washed the disk, changed the pads and replaced the hydraulic oil when I got time one day. Braking was restored to like 50% from 10%. And since then it's stuck to 50% even though I changed the pads and hydraulic oil once again.

              Originally posted by The Monk View Post
              Is the front fork fine? If different quantities of oil were filled in, then your braking is bound to suffer dramatically. And no matter what amount of repairing you do to the brakes, its not going to help.
              No, equal quantities of bajaj suspension oil filled every time. It's 2 bottles for each side. Approx 320 ml each side (I don't remember the exact quantity). I change suspension oil every year. This is UG4 P180. It has big diameter forks like P220.

              I even thought to skim the disk but no one in town does bike disk skimming.
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              • #8
                Re: Do I need to change disk brake rotor after suspension oil spilled on it?

                Just a thought. Since you said the bike was muddy, have you checked the piston, piston boot, boot ring? Check If there is any blockage in these parts! If there is the pads won't bite the disc fully.



                Sent from my ONEPLUS A3003 using xBhp.com mobile app

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                • #9
                  Re: Do I need to change disk brake rotor after suspension oil spilled on it?

                  Originally posted by vizedown View Post
                  Just a thought. Since you said the bike was muddy, have you checked the piston, piston boot, boot ring? Check If there is any blockage in these parts! If there is the pads won't bite the disc fully.



                  Sent from my ONEPLUS A3003 using xBhp.com mobile app
                  Couple of weeks back I changed the pads and machine sanded the whole disk. I also spent some quality time cleaning the whole calliper assembly. Braking restored now to ~70%. I haven't changed the brake oil yet because the reservoir screws keep sleeping. Need some extra professional tool to open it.
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                  • #10
                    Re: Do I need to change disk brake rotor after suspension oil spilled on it?

                    Originally posted by lockhrt999 View Post
                    Couple of weeks back I changed the pads and machine sanded the whole disk. I also spent some quality time cleaning the whole calliper assembly. Braking restored now to ~70%. I haven't changed the brake oil yet because the reservoir screws keep sleeping. Need some extra professional tool to open it.
                    So you are almost there!!!! Just check with a professional on the inner parts of caliper assembly. It's very rare but good to check.

                    I am facing this same problem. But the seal is changed 3 times and within a day the fork leaks oil. I am not sure if mechanic have changed the seal or not if that's the case then he is the culprit. I am planning to do complete modification on my bike so left this problem stand.

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                    • #11
                      Re: Do I need to change disk brake rotor after suspension oil spilled on it?

                      How much u have ridden your bike under harsh condition a disk can last for 30k km if it is the case i would suggest you to change the disk and if not and changing the disk pads doesn't help then i think caliper is not giving the proper pressure to disk pad to stop the plat so as the bike so it can be the problem with break caliper and break assembly i hope it help

                      Sent from my Redmi Note 3 using xBhp.com mobile app

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                      • #12
                        Re: Do I need to change disk brake rotor after suspension oil spilled on it?

                        Originally posted by lovingrajat View Post
                        How much u have ridden your bike under harsh condition a disk can last for 30k km if it is the case i would suggest you to change the disk and if not and changing the disk pads doesn't help then i think caliper is not giving the proper pressure to disk pad to stop the plat so as the bike so it can be the problem with break caliper and break assembly i hope it help

                        Sent from my Redmi Note 3 using xBhp.com mobile app
                        odo is near 35k. 30k life for disk is short I think. Disk should last easily 100k before becoming paper thin. If anyone's interested, I don't use brakes a lot. I heavily rely on engine braking. Few times I don't even need to use brakes (unless I'm stopping) at all when I'm riding sedately.
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                        • #13
                          Re: Do I need to change disk brake rotor after suspension oil spilled on it?

                          Originally posted by lockhrt999 View Post
                          odo is near 35k. 30k life for disk is short I think. Disk should last easily 100k before becoming paper thin. If anyone's interested, I don't use brakes a lot. I heavily rely on engine braking. Few times I don't even need to use brakes (unless I'm stopping) at all when I'm riding sedately.
                          It 30k when heavily use in normal condition it should last 60k atlest but chging disk when it loose it full capacity is a gud idea

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                          • #14
                            Re: Do I need to change disk brake rotor after suspension oil spilled on it?

                            Originally posted by lovingrajat View Post
                            It 30k when heavily use in normal condition it should last 60k atlest but chging disk when it loose it full capacity is a gud idea
                            I'll have to put it on a back burner. This disk costs Rs. 1.4k which is very expensive considering ventilated disks for cars cost Rs. 2k only. Some parts from bajaj are very expensive.
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                            • #15
                              Re: Do I need to change disk brake rotor after suspension oil spilled on it?

                              Everything is come with a cost. Ask for your friend for 700 and add your 700 in it change it now and tell friend u will give him in 2 part 350 after 2 week and 350 after 3 week he and u are happy it was very brutal answer but it works on pocket😋

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