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Thread: Rear brakes locking on

  1. #1
    Registered User Splash's Avatar
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    Rear brakes locking on

    Car is a S14a 200SX with ABS

    Last night I was about 2km from home when my rear brakes locked on so hard that the car was un-drivable. Rotors were glowing and pads smoking, etc.

    Crawled under the car and checked handbrake cables etc and confirmed the handbrake was releasing.

    To get it going again I had to crack a bleed nipple to release the fluid pressure so there's obviously something stopping the fluid from flowing back to the reservoir.

    What could it be? Master cylinder? Booster? ABS Unit?

  2. #2
    Registered User Milkman Don's Avatar
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    This is of similar issue I have

    Not as severe but an occasional similar situation with my triton. Rear brakes (drums) stick and get hot or you feel them bite before the fronts. Ive had them apart, changed shoes/drums, checked clearances, bled brakes multiple times to no avail.

    In all my ABS cars Ive never followed a proper procedure before for bleeding and never had an issue, furthest from unit bleed first to clean and go from there. Was thinking the ABS unit may be carrying a fault or an airlock that havent managed to get out?

    Keen to hear some input from others

  3. #3
    Registered User Stix Zadinia's Avatar
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    could be rubber hoses from the body to the line into the caliper getting old and blocking flow occasionally

    if they've never been changed they might be a good start
    Quote Originally Posted by Smidge View Post
    Would bang. Did bang. Marrying that shit.
    SUNTORY BOSS is the boss of them all since 1992!

  4. #4
    Registered User Splash's Avatar
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    It has braided lines, however they are several years old now

  5. #5
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    Here's a very left field idea. Bleed the brakes.

    Some years ago Junior and I were at the mountain bike nationals in Adelaide in early February. It was about 43 degrees in the shade, and I left my bike in the sun in the middle of the day, because we didn't have enough shade for the riders and the bikes. I got on the bike to ride off to the next practice session, and went nowhere, both brakes locked. The Dot 4 fluid hadn't been changed in a while, and the moisture it had absorbed over time expanded in the heat and pushed the pistons out.

  6. #6
    Registered User Stix Zadinia's Avatar
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    oh, and buy one of these to check your brake fluid water content

    https://www.kincrome.com.au/brake-fluid-tester
    Quote Originally Posted by Smidge View Post
    Would bang. Did bang. Marrying that shit.
    SUNTORY BOSS is the boss of them all since 1992!

  7. #7
    Registered User sssute's Avatar
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    Check your brake pedal is coming all the way up, and there is no pre-load one the clevis. If there is any load on the pin, the fluid wont return to the reservoir.

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