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Thread: sponge brakes after new discs and pads

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    Default sponge brakes after new discs and pads

    Changed front and rear discs/pads. Brakes feel soft even after 200 miles. Can just lock front wheel passenger side if I stamp on the brakes. How could air get into the system or is main servo playing up?

    Thanks in advance.

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    Regular Member Penfold101's Avatar
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    Could try simply bleeding them again mate, and make sure the nipples are tight. Did you change all the brake fluid or just top it up at the end?

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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

    Default

    When you pushed/wound the caliper pistons back in, did you slacken off the bleed nipples or force the brake fluid back into the master cylinder. If the latter, then there's a chance that you've flipped the rubber seals in the master cylinder.

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    Regular Member Jezzy's Avatar
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    Quote Originally Posted by Big Dave View Post
    When you pushed/wound the caliper pistons back in, did you slacken off the bleed nipples or force the brake fluid back into the master cylinder. If the latter, then there's a chance that you've flipped the rubber seals in the master cylinder.
    I was under the impression that couldnt happen on the VecC..?

    Anyway, I'd say your brakes arent bedded in properly yet, and until they do they'll feel rubbish, and you shouldn't be trying to get the wheels to lock until they are fully bedded in, or you'll glaze the pads.

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    I will wait a few weeks to allow brakes to bed in and then see if I need to do any bleeding.

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    Quote Originally Posted by Jezzy View Post
    I was under the impression that couldnt happen on the VecC..?

    Anyway, I'd say your brakes arent bedded in properly yet, and until they do they'll feel rubbish, and you shouldn't be trying to get the wheels to lock until they are fully bedded in, or you'll glaze the pads.

    not sure if it happens or not but after vx changed my front discs and pads i had same symtoms took it back and they said apprentice must of pumped up the pedal to hard and flipped the seals, two hours later all sorted

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    Flipped seals what does that mean? Is it a DIY fix?

    The brakes work but are really soft, left off cap and removed any excess fluid when doing brakes.

    Thanks for the info so far.

  8. #8
    Regular Member mattv6diesel's Avatar
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    Vehicle : Bmw 330d

    Trim : Msport

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    old cars used to do it astra f's the master cylinder seal would roll over then fail. might just be worth getting them bled at a dealer and get the system checked if they say ok wouldn't wory. vectra b abs modules used to fail causing this problem but doesn't tend to happen anymore.

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    My Vec is 3 years old and I replaced the brake fluid today, I was surprised how much air was in the system. I used the eazibleed system and flush it all out, I even did the clutch fluid which came out a nice brown colour

    I would bleed/replace the brake fluid.

    Frenchman

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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

    Default

    Also it's not advisable to force brake fluid back through the ABS pump, as it may well be dirty and damage the pump. Best to slacken off the bleed screw when pushing/winding the caliper pistons back in and expel the old fluid into a jam jar via a rubber tube.

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