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Thread: What causes L and R rear disc brakes to brake unevenly?

  1. #16
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    Quote Originally Posted by Sinbad View Post
    There's no crossover valve - left and right are on completely separate hydraulic circuits to provide braking in the event of one circuit failing
    you sure about that because I would think that's the only thing it could be?

    I don't see how it can be the disk or pads, It has to be the hydraulics.
    I would start with just bleeding the brakes seeing that they worked on them. Test if you can? Don't know how you can easily test that. Then replace seals for the break cylinder.
    Last edited by rietrot; 14-06-2018 at 07:45 PM.

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    If you don't know about separate circuits you probably shouldn't be giving advice
    Quote Originally Posted by sajunky View Post
    It is a Chrismas time, animals speak human language, deamons speak through the humans, it is normal. Honesty is the way we can combat it.

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    Quote Originally Posted by Sinbad View Post
    If you don't know about separate circuits you probably shouldn't be giving advice
    I haven't seen the i20s underneath yet. Separate circuits or not my advice is valid.
    I'm willing to bet it is a hydraulic problem and bleeding the breaks wil likely solve it. Or else if there is dual circuits then one of the break cylinders is working harder than the other ones.

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    Is the tyres on the left and the right the same brand? Still shouldnt be a massive difference even if it is the case

  5. #20
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    Quote Originally Posted by RandomGeek View Post
    Is the tyres on the left and the right the same brand? Still shouldnt be a massive difference even if it is the case
    Fair Q.

    Yes, identical. New tackies and mags when the caliper firmware was upgraded 8 months ago.

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    Quote Originally Posted by Arthur View Post
    Fair Q.

    Yes, identical. New tackies and mags when the caliper firmware was upgraded 8 months ago.
    Well based on all the info given i put R50 on the root cause being the testing machine being faulty

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    Quote Originally Posted by RandomGeek View Post
    Well based on all the info given i put R50 on the root cause being the testing machine being faulty
    My worry too. Small town, only one testbed alley. No recourse, no alternative.

    Once I've had the hydraulics, discs and pads checked I'll redo the rw. If the discrepancy persists then I'll suggest they test with the car facing the other way.

    Can't alienate the tester, because the Voyager is up next.
    Last edited by Arthur; 14-06-2018 at 08:43 PM.

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    I'm sure they test enough cars to know when the equipment is faulty if that's the case they will fail everyone.

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    Good point.

    All they had today was five trucks and the little grocery-getter. Immediately before me was a huuuge 22-wheeler.

    Still, I hope you're right. Brakes easier to fix than faulty test equipment.

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    If it is the testing machine, maybe ask the guy if you can turn the car around and test the wheels the other way round. If the problem stays the same, then it’s their machine. If it moves sides along with the car, then it’s something on your car.

    If it were my car I’d be having a look to make sure that the piston on one side is not maybe a little sticky in the caliper. Maybe pull the dust cover off and have a look at the piston to make sure it’s not got a bit of dirt making it stick.


    Quote Originally Posted by Arthur View Post
    (Or is the rw tester schnaaing me?)
    Doubt he’d be able to take the results. The machine will print out what it read.
    Last edited by Colin62; 15-06-2018 at 09:29 AM.

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    Quote Originally Posted by Arthur View Post
    (Or is the rw tester schnaaing me?)
    If you want, I can ask him?
    (ಠ_ಠ)

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    I still reckon the caliper is sticky on its pins, resulting in it not exerting force on both sides of the disc.
    Quote Originally Posted by sajunky View Post
    It is a Chrismas time, animals speak human language, deamons speak through the humans, it is normal. Honesty is the way we can combat it.

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    I would bleed the system before going further. Maybe fit new bias valves. A sticking caliper could also be troublesome causing both the pads and discs to wear unevenly. Check the guide pins too, make sure they are well greased up with good grease.
    Soooo, where do you see yourself in five years?

  14. #29
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    Bias valve is a good candidate as well.
    Quote Originally Posted by sajunky View Post
    It is a Chrismas time, animals speak human language, deamons speak through the humans, it is normal. Honesty is the way we can combat it.

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    If you bleed the brakes diy make sure you fully retract the pistons before you do so or instruct the mechanic to do that, very important to get all the old brake fluid out and the fluid in the caliper just behind the piston is normally the worst, all the wear residue from the piston/seals accumulates there including it being constantly heat cycled.

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