Ford Kuga brake issue

[Rob197]

Hi, on Christmas day my sisters Kuga 2.0 diesel lost all brake pressure. The pedal just went to the floor, I filled the reservoir back up as it was empty and limped it to a garage, they have bled the brakes and it had a pedal and stops.
But where did the fluid go in the first place? No obvious leaks when I looked under it but it was dark and raining!

[E-bmw]

Try looking again when it isn't dark & raining.

Joking aside it could be anywhere from here to Timbuktu, if you can't see any evidence of leaks we certainly won't.

Did the garage check the full system out before handing the car back?

Have you done your own due diligence & checked the level since?

[Sheepshanks]

I've read about these having a combined system with the clutch and the slave cylinder leaking onto the undertray (so you see can't it).

Unfortunately the slave cylinder is inside the bell-housing.

[E-bmw]

Sheepshanks said:

I've read about these having a combined system with the clutch and the slave cylinder leaking onto the undertray (so you see can't it).

Unfortunately the slave cylinder is inside the bell-housing.

However as most cars have a combined reservoir with a weir between clutch & brake that should mean that a clutch leak will still leave fluid in the brake side, so that doesn't explain the issue.

[GreenV8S]

If the reservoir was empty, you have a leak.

Peering under the car when it's dark and raining is hardly an effective way to find it.

[Sheepshanks]

E-bmw said:

However as most cars have a combined reservoir with a weir between clutch & brake that should mean that a clutch leak will still leave fluid in the brake side, so that doesn't explain the issue.

Ah, fair enough. It's bad enough having the clutch slave cylinder inside the gearbox - it leaking and causing brake failure would be beyond the pail.