brake failure
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Thread: brake failure

  1. #1
    Tadpole DSdub's Avatar
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    Default brake failure

    Lost the use of the front brakes yesterday on my 69 ID20 DSuper
    the rear ones still kick in when you really punch down the pedal so got home that way but still a bit hair raising
    the brake piston/cylinder thing at foot well hissings alot when I press - this is a new sound
    handbrake still works so callipers aren't seized
    Anyone got any advice on this problem ?
    will bring it to the mechanic but it would be good to know that hes talking sense and not seeing more dollar signs than normal
    thanks
    rob

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  2. #2
    Fellow Frogger!
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    Quote Originally Posted by DSdub View Post
    Lost the use of the front brakes yesterday on my 69 ID20 DSuper
    the rear ones still kick in when you really punch down the pedal so got home that way but still a bit hair raising
    the brake piston/cylinder thing at foot well hissings alot when I press - this is a new sound
    handbrake still works so callipers aren't seized
    Anyone got any advice on this problem ?
    will bring it to the mechanic but it would be good to know that hes talking sense and not seeing more dollar signs than normal
    thanks
    rob
    Rob - as a guess as you an ID is that either one of the front spheres blew or the main accumulator. It sounds as though you have gotten a massive amount of gas in the brake system. Check the system reservoir with the system pressurized and see if your fluid level has dropped from its normal position. If it has and no external leaks, an sphere/accumulator had died and the missing fluid is now filled the space where the gas use to be. The other possibility is that system is just low on fluid and you have pumped in air to the brake system.

    Before taking it anywhere bleed the front brakes. You should get a lot of gas out of the bleed lines before you start seeing fluid.

    Steve

  3. #3
    BVH Roger Wilkinson's Avatar
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    Further to Steve's comments, if it is a ruptured front sphere the suspension on that corner will be hard. Try pushing down on each front corner of the car with the engine running and car at normal ride height. If it is a ruptured accumulator the hydraulic pump will be working too hard. Does the car have power steering? If so, it will have a belt-driven pump. You will hear the main pressure regulator kick in and out with a loud click. If the main accumulator sphere still contains gas pressure the regulator will kick in every 30 seconds or so, and maybe an even greater interval. If the accumulator has ruptured the pump might kick in every 5 seconds or so.

    The usual symptom of a small amount of air in the brake system is delayed braking. You press the button and after a second or so the brakes come on. If there is a massive amount of air, perhaps ti takes so long to compress the air that by the time the front brakes actuate the rear shoes have stopped the car anyway. You are lucky the rear brakes are working.

    Roger

  4. #4
    Tadpole DSdub's Avatar
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    Thanks guys - will investigate it and let you know!

  5. #5
    UFO
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    CitroŽn Tragic UFO's Avatar
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    The handbrake is a separate mechanism and pads to the foot actuated brakes.
    Craig K
    2009 C5 HDi Exclusive

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