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Thread: Dodgy Brakes

  1. #1
    Regular Member conman's Avatar
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    Vehicle : Vectra C

    Trim : SRI

    Engine : 2.2 DTI

    Year : 2002

    Mileage : 98,000

    Default Dodgy Brakes

    Hey guys, I was having a problem with the handbrake so stripped down the rear calipers and un-seized everything and put on new seals and shoes. After that I bled the brakes using a Gunson Bleeder and when finished the pedal was sinking to the floor, I then got the nephew to help me and bled them again manually and he said all was running out clear and the brake was tight as a drum but once the engine was started the brake sinks very slowly when I keep my foot on it and if I'm driving and hit the brakes the car stops no problem but if I hit the brake, let go and hit it again real quick a second time the car keeps going, although the pedal is still hard the car wont brake and if I drive it another bit and brake it stops no problem. Seems if you hit it twice or three times straight after each other it wont stop the car and pedal stays hard.

    Anyone any ideas on why this is happening. I was thinking master cylinder but ruled it out as the car was fine before I changed everything and made sure I had the reservoir cap off before doing any work. Could it be that maybe the calipers have seized again although the hand brake is working perfect now when before it was locking the wheels up every time you used it and didn't release until you were 3 mile down the road. Has me baffled and feeling a bit uneasy using the car until I know how to fix it, maybe I need new rear calipers altogether but have a feeling it's something really stupid or could the bleeder have blew air somewhere I don't know about or maybe there is a certain way to bleed the brakes in these cars as I only bought it and don't know a big lot about it.

  2. #2
    Regular Member MrDerv's Avatar
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    it's normal, it's called diesel creep. Moreprominent if there's still air in the brake lines.

    You'll need to bleed the whole brake circuit to return it to normal

  3. #3
    Regular Member beat275's Avatar
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    Vehicle : Hatch

    Trim : SRI

    Engine : 2.0T

    Year : 2003

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    Abs module

  4. #4
    Regular Member conman's Avatar
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    Vehicle : Vectra C

    Trim : SRI

    Engine : 2.2 DTI

    Year : 2002

    Mileage : 98,000

    Default

    @ MrDerv, How would I bleed the whole brake circuit mate?

    @beat275 Abs was working fine as we tested that straight after bleeding the brakes mate.

  5. #5
    Regular Member MattVecVXR's Avatar
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    Trim : VXR

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    Bleed the whole system by bleeding all 4 calipers in any order, you'd be surprised where air can find its way into a fluid system when its opened up.

  6. #6
    Regular Member conman's Avatar
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    Vehicle : Vectra C

    Trim : SRI

    Engine : 2.2 DTI

    Year : 2002

    Mileage : 98,000

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    Has my head wrecked, might just leave it into a garage somewhere and let them sort it out. Problem is getting a garage that's not gonna rip you off these days.

  7. #7
    Regular Member Beardy's Avatar
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    Vehicle : Astra

    Trim : Elite

    Engine : 1.7 CDTI

    Year : 2004

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    Default

    Quote Originally Posted by CDTiMatt View Post
    Bleed the whole system by bleeding all 4 calipers in any order, you'd be surprised where air can find its way into a fluid system when its opened up.
    Ive bin told to start with the brake furthest away from the master cylinder then work your way forward when bleedin a whole system

  8. #8
    Regular Member stevie16v's Avatar
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    Vehicle : Vectra

    Trim : SRI XP1



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    Have you double checked to make sure that one of the new seals hasn't slipped? It may be leaking by the piston

  9. #9
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    Vehicle : 3.2 gsi

    Trim : gsi

    Engine : 3.2 v6

    Year : 2003

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    did you wind rear pistons in or push them?? only asking cos on my old vectra i pushed em in and it flipped a seal in master cylinder brakes felt like describing

  10. #10
    Regular Member conman's Avatar
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    Vehicle : Vectra C

    Trim : SRI

    Engine : 2.2 DTI

    Year : 2002

    Mileage : 98,000

    Default

    Had the pistons completely removed and winded them back in while the reservoir cap was removed plus new seals are sound, no leaks etc. I also bled the old fluid out completely and new fluid in. If I didn't know any better I'd say there was still air in the system but bled a whole bottle through and no bubbles at all. I'm going to take the calipers off again and give them another check over just to make sure everything is ok. I'll make sure there is no damage and try again. I think if there is at least one tiny bubble in these systems it has a really big effect. So once I have checked everything again I will run the bottle of fluid though twice just to make sure it's air free and if that fails I'll get another master cylinder and see if that cures the problem. Will keep ya'll updated guys, thanks for you help

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