Question about 2005 Isuzu Vehicross

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Brakes are real spongy and we changed the master cylender, and bled them but still spongy, the peadle is nice and hard when not running but as soon as u start it peadle goes right to the floor? i dont understand

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Hi.

it sounds like there is still some air in the brake system.

when the engine is not running the brake servo is not working either. when you start the engine, the servo works as well, putting far more pressure on the brakes.

bleed the system again, starting at the cylinder furthest from the master working to the nearest.
if this does not improve the brakes then try bleeding the system again, but with the engine running to activate the servo system. this should expel any remaining air.
BE CAREFUL doing this. always put safety first. try to use axle stands to lift the drive wheels if possible.

Posted on May 25, 2011

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