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Old 04-15-2006, 10:08 PM   #1
lgo
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Default Oil in Master Cylinder (is it possible?!!...)

Yesterday I was happily reassembling everything under the car (oilpan gasket replacement, fixed the steering rack, new balljoints and bushings, etc) when I noticed a fair amount of oil (motor oil) leaking the brake master cylinder... now I know have a problem with oil blowing into the intake duct but I never thought it was so severe... before dissasambling anything can someone say me if this can be possible (maybe the oil was sprayed when someone else was working in the car)

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Old 04-15-2006, 10:59 PM   #2
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Are you sure it's engine oil and not the MC leaking? unless it was dripping large amounds (have someone push the brakes while you're looking) I'd say either it's brake fluid leaking out of a fitting, the plastic bit on the top is cracked, or maybe someone just dumped fluid all over the place while topping it off.
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Old 04-17-2006, 11:17 AM   #3
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Default Re: Oil in Master Cylinder (is it possible?!!...)

Quote:
Originally Posted by lgo
(motor oil) leaking the brake master cylinder...
Motor oil leaked into the M/C, leaking out of the m/c or is it in the booster?
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Old 04-17-2006, 02:15 PM   #4
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I would say there's some major problem if there is motor oil in the master cylinder, considering that the only connection the master cylinder has to the engine is through the brake booster... and even then, it is through the line between the intake manifold and the brake booster... and if there is oil in the brake booster, it means the check valve is gone, among other things.... and if the oil is finding its way into the master cylinder through the booster, there's a leak in the seals on the master cylinder... what's the brake performance been like?

chances are that you're not seeing motor oil in the m/c though... you're just seeing old brake fluid... when it gets old, it tends to turn brown... at least mine was brown when I bled my brakes... which means, it probably wouldn't be a bad idea for me (and for you) to get the whole system flushed out
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Old 04-17-2006, 03:57 PM   #5
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Quote:
Originally Posted by ianlee91
I would say there's some major problem if there is motor oil in the master cylinder, considering that the only connection the master cylinder has to the engine is through the brake booster... and even then, it is through the line between the intake manifold and the brake booster... and if there is oil in the brake booster, it means the check valve is gone, among other things.... and if the oil is finding its way into the master cylinder through the booster, there's a leak in the seals on the master cylinder... what's the brake performance been like?

chances are that you're not seeing motor oil in the m/c though... you're just seeing old brake fluid... when it gets old, it tends to turn brown... at least mine was brown when I bled my brakes... which means, it probably wouldn't be a bad idea for me (and for you) to get the whole system flushed out
+1

I bled the brakes of a 510wagon a while back, and i just kept bleeding till all of the brown sludge came out and it was flowing clear. It's pretty ing what will come through those lines after a long enough time.
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