Pressure testing a new brake system

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    East Midlands Regional Coordinator Nemesis's Avatar
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    Pressure testing a new brake system

    Hi all

    I've re-done my brake lines and have new calipers on the front of my car.

    I'm going to fill it with brake fluid shortly and bleed it.

    If I then step on the pedal as hard as I can, will this be the max pressure it will ever see? ie if it's going to leak, it would leak then?

    I'm just looking for some confidence in what I've built
    Quote Originally Posted by Benn
    When there are titties. I'm always free to help.

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    Re: Pressure testing a new brake system

    It should be, as that can be expected to be well beyond the point where wheel-lockup, or BBS kicking in, would be expected to occur. If ABS isn't fitted, you may hit higher pressures under extreme panic braking.
    While you're at it, it is a good time to check for flexing around the brake master cylinder mounting - I suspect that is responsible for more "spongy" brakes than brake hoses - back in the day, the Mk IV/V Cortinas were terrible for that. You may wish to add some plating or bracing?
    NOTE, these are my thoughts and opinions, sometimes I'm wrong ;-)

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    East Midlands Regional Coordinator Nemesis's Avatar
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    Re: Pressure testing a new brake system

    Thanks for that, yes it's non ABS and yes Im planning on bracing the M/C

    Would panic braking on the road/track see more pressure than I could create in a static test? My plan was to literally brace myself against the seat and push the pedal as hard as physically possible.

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    Re: Pressure testing a new brake system

    Better be careful you don't break the seat, then.
    When braking, you also have the dec'n throwing your body forwards so there isn't the limiting feeling of pushing the seat back - don't know how much difference it will make for you, though.

    A full line pressure check like that will test the high pressure sealing, but with seals, in particular, they can leak at very low pressures if the seal lips aren't in sufficient contact with the bore walls. Do the pressure test and have a good look for 'damp' around the various connections after, and every time it is on the hoist or the wheels are off.
    Remember Schumi' a few years ago at the British F1 race when a bleed nipple loosened - if someone with that experience didn't notice the brakes starting to go off...
    NOTE, these are my thoughts and opinions, sometimes I'm wrong ;-)

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    East Midlands Regional Coordinator Nemesis's Avatar
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    Re: Pressure testing a new brake system

    I've done it and found a few leaks and one crossed thread, cheers.

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