Good day.
In about a week, the low level brake fluid warning light comes on again after refilling. No drips anywhere, nothing wet. Is the suspect the brakes booster sucking it into the intake, or is it the master cylinder butt leaking into the booster and further sucked into the intake ?
Where/how do I diagnose this ? Replacing the vacuum pipe with a clear hose to check if fluid gets/flows inside ?

See the alternative of the 'repair kit' but seems to me there is only external and reservoir rubber gaskets. Are the piston seals included??? or I have to find those somewhere else ?

 

I know you mentioned no drips or anything wet. Looking at reservoir where the plastic reservoir bits attach to booster, is the paint chipped or cracked at all? I know you mentioned no drips/wet. I had a tiny leak there because the big O ring failed and it was leaking onto the paint and had eaten away at the paint. It didn't look wet, nor could I see the drips as it just ran down the angled attachment. The only indication was the paint chipping. Although my leak was tiny, and only required filling it up once before I noticed it.

Do you notice any changes in brake performance?

 

Thank you.
See no wetness under the reservoir and I do not know if the disappearing fluid is puddling inside the booster or where is it going
Perhaps will remove the grommet for the booster vacuum pipe and insert a hose in there to probe/suck inside. Brakes feel poor if refilling is delayed.

 

If that's dry pull the bolts holding the master to the brake booster, verify it's not leaking into the booster via a leaky o Ring.


You can add a UV dye to your fluid. With a black light, yellow tint glasses and a dark garage you'll find where it's going.

 

Pulled the booster vacuum grommet, inserted an intravenous hose ~2.5mm and unable to suck fluid twisting it around, but few droplets. The grommet inside is as clean and dry as can be.

 

I had a caliper seal malfunction recently.

Could not see any leak from under the vehicle looking at the calipers but once I took off the tire you could see the leak

 

I just obeyed you; found some wetness by rear left caliper. Not corresponding to the amount of refills, but worth investigating. Thanks !.

 

check all the hard pipe (metal lines), too. my '02 lived in Detroit for a portion of its life and the winter salt eventually caused a spot of rust that burst upon hard braking. fortunately, i was in a parking lot when this happened as i was checking my repairs/replacement of the soft lines for leaks by accelerating and slamming on the brakes

 

False alarm...
Removed the caliper and is as dry as can be. Its rubber gasket is also dry. No leaks at all there. The disc and the inner brake pad are oily probably leaking from the axle.
Back to page zero, now with an extra trouble. To replace the o-ring behind the rear hub besides the disappearing brake fluid.






Which one is the robbery...

 

Did you say "rubbery"?