Brake vacuum hose leak d90 - Defender Source
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Old February 18th, 2014, 07:27 AM
tim
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Timothy Homewood
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Brake vacuum hose leak d90

Hi, a quick tech question.. My 50th anniversary (very similar to the d90 nas) has sprung a very small leak in the break servo vacuum hose which goes from the brake servo to just below the engine cover with the 4.0L cast in it.
I only noticed the leak once parked as there was steam coming from under the hood where a small jet of liquid was hitting the engine. I assumed this was water, but it appears rather flurecent green, and followed this back to the brake servo. All vital liquids are normal so the leak may only be at rest or is minimal.
So, it is easy enough to fix the leak, either by replacing the tube or sleeve and jubilee clip, however, I have to ask if he fluids being ejected should be there at all? Is this normal?
Could this be a small leak in the brake servo, which collects around the air intake (plenum ?) and is ejected as it boils. And if this is the case does it mean the engine is breathing brake fluid? Again, there is no notable loss of fluids in the various tanks and the brakes work fine. Indeed, for the moment electrical tape stops the pin hole leak.
Maybe over thinking this, please advise.

Cheers, tim
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  #2  
Old February 18th, 2014, 07:56 AM
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leastonce
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Jason England
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Quote:
Originally Posted by tim View Post
Hi, a quick tech question.. My 50th anniversary (very similar to the d90 nas) has sprung a very small leak in the break servo vacuum hose which goes from the brake servo to just below the engine cover with the 4.0L cast in it. I only noticed the leak once parked as there was steam coming from under the hood where a small jet of liquid was hitting the engine. I assumed this was water, but it appears rather flurecent green, and followed this back to the brake servo. All vital liquids are normal so the leak may only be at rest or is minimal. So, it is easy enough to fix the leak, either by replacing the tube or sleeve and jubilee clip, however, I have to ask if he fluids being ejected should be there at all? Is this normal? Could this be a small leak in the brake servo, which collects around the air intake (plenum ?) and is ejected as it boils. And if this is the case does it mean the engine is breathing brake fluid? Again, there is no notable loss of fluids in the various tanks and the brakes work fine. Indeed, for the moment electrical tape stops the pin hole leak. Maybe over thinking this, please advise. Cheers, tim
Anti freeze is probably that color. Sound like a water leak. Post a photo and we can help more.
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Old February 19th, 2014, 12:25 AM
tim
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Timothy Homewood
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Exellent observation and solved!

Spot on! I double checked and indeed the leak was from the smaller coolant hose just below the brake vacuum pipe. The jet of coolant was simply deflected from th pipe above. Cheers! Tim
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