Fluid out of rear brakes

[wanta4runner]

Checked the brake fluid level and it was full. Guess it's time for new axle seals.


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[thegipper]

Synthetic doesn't "cause" the leak but it is more prone to leak due to its inherent characteristics.

 

[Myrunr2010]

Hmmm, I pretty much proved that the leak was caused by the breather as it was the only think I fixed given that everything else was baselined being new and not leaking before or after. Empirical enough for me.

By your own admission, you've only driven 2k more than you did last time before you had issues. In the grand scheme of things, thats nothing.

 

[thegipper]

My abs rings had some oil on them, granted it was not a lot but it was definitely present.

I did the extended breather mod, cleaned out the housing and 5,000ish miles later, not a drop of oil on the ABS rings anymore.

Not to get in a pissing match but why did toyota put a breather in there in the first place if it not to release excess pressure? If the pressure wasn't a factor and wouldn't compromise anything (seals), it wouldn't be on there.

Call it what you will...

 

[JRZEE2000TR4LTD]

By your own admission, you've only driven 2k more than you did last time before you had issues. In the grand scheme of things, thats nothing.

I never had issues to begin with on this truck. I moved all the new parts I had from my other truck (which was totaled and had leaking seals pretty bad when I bought it) onto this one (bearings, dust boots, replaced axle seals new again) The new truck wasn't leaking at all. Didn't leak afterward for 5000 miles. Always bone dry. Went wheeling. Two weeks later ( maybe 150 miles) Oil on ABS ring. Cleaned and diff breather mod. Have since driven 7000 miles which includes almost 3000 mile trip to FL and back. Also another wheeling trip in there. Still bone dry.
Pretty cut and "dry" if you ask me. Pardon the pun.

 

[catrains]

Checked the brake fluid level and it was full. Guess it's time for new axle seals.


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why are you replacing the seals when it can be a simple cleaning or replacing of the diff vent.

check the vent to see if it is open if not then replace it .. clean up wheel / axle area then fill rear diff .. see if it holds.

sometimes owners can over react to this type stuff .then they create more $$$costs and problems.

Toyota being a very reliable vehicle , hard to understand why they vented everything properly except this rear diff ???.

 

[catrains]

I know this is commonly accepted as the reason that axle seals go, but I have a real hard time believing it, unless those seals are far more fragile than I think. I really don't think your thermal expansion rates are high enough under normal operating temperatures to cause enough pressure to cause the leak.

gear oil on the rear diff gets hot . when the air temps drop the oil expands even more from vehicle operation under load. that gear oil expands like a SOB !

drive 10-20 miles then put your hand on the diff.

no venting it will push out the seal lips and leak out some gear oil and gear oil shows more than what is actually leaking . small drop of gear oil looks much larger than engine oil leaking the same amount.