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

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    Rusted lockhrt999's Avatar
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    Default 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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    Moderator The Monk's Avatar
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    Default 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.
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    Default Re: Do I need to change disk brake rotor after suspension oil spilled on it?

    Quote 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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    Rusted lockhrt999's Avatar
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    Default Re: Do I need to change disk brake rotor after suspension oil spilled on it?

    Quote 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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    Default Re: Do I need to change disk brake rotor after suspension oil spilled on it?

    Quote 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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    Moderator The Monk's Avatar
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    Default 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.
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    Default Re: Do I need to change disk brake rotor after suspension oil spilled on it?

    Quote 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.

    Quote 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.

    Quote 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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    Default 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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    Rusted lockhrt999's Avatar
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    Default Re: Do I need to change disk brake rotor after suspension oil spilled on it?

    Quote 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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    Default Re: Do I need to change disk brake rotor after suspension oil spilled on it?

    Quote 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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