Brake fluid disappears

[Christine fannon]

2001 model. Keeps losing brake fluid in very short time. 2 new master cylinders and all hoses tightened multiple times. Not leaking onto driveway. Has been in shop 4 times but no one can find a leak. ABS light also goes on intermittently but no problem found. The fluid is going SOMEWHERE...Ideas?

 

[swshawaii]

How much brake fluid loss? Leaking caliper piston seals are somewhat common, but should leave traces of fluid.

 

[Christine fannon]

How much brake fluid loss? Leaking caliper piston seals are somewhat common, but should leave traces of fluid.

It drops from max to min in a month or so.

 

[Jeff Hachmann]

Could be leaking into the brake booster

 

[Christine fannon]

T

Could be leaking into the brake booster

Thanks. I asked them about that and they said they did check.

 

[Jeff Hachmann]

If it's not leaking at the calipers, master cylinder or into the brake booster then only other place I can think of would be one of the connections at the ABS module.

 

[user 78012]

Orrrrr… and hear me out….


Aliens.


But seriously, there are only a handful of places to look, and if your mechanic can’t find it, I would suggest taking it somewhere else.

 

[Doug Kaye]

calipers can be tricky.. my son's WRX had leaky calipers but I couldn't see anything at first, had to clean everything up, calipers, lines etc then inspect a couple of times, to pin it down..

 

[Jim]

I recently had a similar issue with my 2001 Sport Trac. Brake fluid was mysteriously leaking somewhere as I had to add almost a full can over a 3 month period. My mechanic finally discovered the brake check valve by one of the front wheels was leaking; had it replaced and everything seems fine. Another idea to look into.