(Another) Mystery Brake Fluid Loss

amcdonald

amcdonald

Active Member
Hello

So, have refilled the reservoir a couple of times. Not a drop of fluid on garage floor where the car spends 99% of its time. Inspected hoses - nothing obvious. Driver carpet dry, definitely not coming through from master cylinder (had that before). Tested the reservoirs (NADA 3500S) and it's not sploshing past the O ring (had that before - with no O ring).
Yesterday I drilled a couple of tiny holes in the bottom of the rear caliper covers expecting the tell tale dribble (like last time this happened). Bone dry! Good news on the whole the rears don't need to be done. So it must be the "professionally recon" servo, right? Removed servo expecting fluid to dribble / pour out. Nothing!

Question, I have not removed the valve / hose attachment on the servo. I am wondering if that is needed to be done to properly check if there is anything in it, for instance if the valve would preclude fluid coming out. Obviously it's way too heavy to determine sloshing. I also have no clue how it would come out and the last thing I need is having to recondition the servo if there is nothing wrong with it after I bugger up the hose attachment point.

Also. Where to look next!!!!???? Stumped.
 
It’s going to be the servo. Pull the vacuum hose and check valve from it (they are held in place by a rubber seal so easy to remove) and dip with a cloth on a wire or chopstick. It’ll most likely come out wet. If so, time to rebuild or replace it.
 
I have already removed the servo and nothing is dribbling out of the hose inlets when held upside down and generally being wiggled around……I have not tried to remove either of the two connectors.
 
Okay so the servo is dry. Took the opportunity to repaint it (again). And sprayed rubberized undercoating on the inner wing for the inevitable fluid dribbling destroying my spray paint finish (again). But with dry caliper covers and dry servo, and not a solitary drip on garage floor the whereabouts of about 1/2-1/3 pint of brake fluid remains a mystery……..
 
Have a very close look at the front calipers. They can leak without dripping. only sign is the dust is mildly wet and maybe a short run somewhere. Greasy caliper is also a sign. They get hot very quickly in use and if the leak is only occuring when the brake is on it,ll dry up before dripping.
 
Yes, no usual suspects. It must be disappearing under braking from somewhere so will poke around at the calipers. Once I have bled the system groan.
 
Good morning,

Could it be related to the gearbox?
I know it sounds strange, but we used to own a 1972 Peugeot 304 in which the brake fluid pressure was used to control the gear switching some how. We had the same issue on this car and couldn’t figure out where the leakage was coming from .

Good luck

Wilfred
 
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