Too much clutch Fluid - clutch problems ?

[del mar]

afternoon,

We have a 2006 A Class, which has brakes and clutch from same reservoir.

Brake Fluid was changed and then I changed all the brakes - probably should have done brakes then fluid.

Yesterday after 4 hours on the M25 the clutch pedal seemed a bit weak and first and reverse were difficult to select.

Looking at the reservoir it was almost up to the cap well above the max level. Clearly new fluid and pushing all the pistons back into the calliper has raised the level.

I drew out enough fluid to get it back down to the max level, and gears work as they should.

Anything meaningful here or did is just get too hot in stop start traffic ?

Thanks

Del

[E-bmw]

Too much fluid wouldn't normally cause an issue unless it was so high that the (normally) expandable concertina seal in the top is completely filled causing an airlock to stop the fluid going where you want it.

(that may not be the best explanation, but hopefully you understand it)

It is more likely that you had an airlock which has managed to work its way out in the process.

[del mar]

E-bmw said:

Too much fluid wouldn't normally cause an issue unless it was so high that the (normally) expandable concertina seal in the top is completely filled causing an airlock to stop the fluid going where you want it.

(that may not be the best explanation, but hopefully you understand it)

It is more likely that you had an airlock which has managed to work its way out in the process.

I like the sound of that

thanks

[james_gt3rs]

Weird, I've had my brake fluid reservoir full before and never noticed any difference.

[E-bmw]

Me too, but I have also had similar issues many years ago (forget which car) which cleared as the fluid was drained to below the max, never TRULY explained it, but it never came back so sounded remotely possible.