Overfilled brake fluid

NO. Barnray

No. Overfilling won't cause it to leak

What is more likely is that when the cylinders were checked, they have disturbed the seals. It can happen very easily. Peal back the dust boot, see if they are wet, adjust the shoes and all seems fine. The simple act of checking can cause the problem.
Inside the cylinder wil get a slight ring of rust build up. When the shoes are adjusted the pistons now move further out of the bore, contacts the rust ring, and splits the seal.


Donks1

From what I can make out the correct way to check brake fluid level is turn the motor off and pump the brake pedal about 20 times then check it. It will then be down at what they say is the correct level.
Under normal use it always appears over full.

A australian spec 100 series will have disc brakes on the rear

Are you sure the rear caliper is leaking fluid or is the fluid you are seeing the result of someone replacing the brake fluid & not washing it down afterwards

The information posted earlier is relevent to drum brake rear end & this is applicable to a aust spec 100 series

Regards Don

Were any of the brake shoes or pads replaced.B