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Brake Master Cylinder Replacement 900

posted by  someone claiming to be rwreagan on  Sun Nov 23 07:44 CST 2003 [RELATED]

My friend has a '90 740 GLE with over 200K miles. The brake pedal has started slowly easing to the floor when pressed for several seconds (train, traffic light, etc.). I'm assuming this is an indication of a leaking master cylinder.

Could there be another cause for this symptom, or should I just go ahead and replace the master cylinder? If so, is there anything special I should know? I assume I'd just transfer the resorvoir, bench bleed the master cylinder, and then bolt it on. Then pressure bleed each wheel cylinder. Anything else I should know? And what is the preferred order for bleeding the wheel cylinders?

The car has ABS brakes.

Thanks for any and all advice.

Robert Reagan







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    Brake Master Cylinder Replacement 900

    posted by  Bram Smits on  Sun Nov 23 08:33 CST 2003
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    >I'm assuming this is an indication of a leaking master cylinder.

    Assuming there's no external fluid loss, almost certainly.

    Yeah, I'd just replace it. Personally I don't even bother benchbleeding it; just put it in, then pressure bleed (I'm using the Eezibleed but any pressure bleeder will do the job, it's not rocket science). First the bleeder on the MC itself (depends on type, some don't have it), then right rear, left rear, right front and left front, although even that's not all that critical. Main thing is to bleed the rear axle before the front axle.

    Bram







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