Hi all Paul here from South Africa. I have a Hyundai i20 2010 Model. I have a brake pedal that sinks, but sinks only half way down, and stops the Vehicle perfectly. But a bit nerve wrecking with the sinking Pedal. Master cylinder has been changed, and the new one checked for seal bypass, but in good condition. There are no fluid leaks, and all Caliper pins Have been cleaned and greased and slide perfectly. More than 1 Mechanic has now told me it can now only be the ABS Unit, and needs to be replaced. The Vehicle has been to the test center for a brake test more than once, and passes with good braking results. The Brake Booster has also been tested and all 8 Brake pads perfect. There are no fault codes, the ABS light goes out, and the Vehicle has had its Brakes bled by Computer twice. Is this a common problem on i20 maybe . Your inputs and help will be appreciated thank you