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Ched · 8th February 2021, 18:26

I have the exact same problem in my 190 that is being recommissioned.

It was working fine then a couple of days later pedal to the floor, as the car had been parked for a number of years I was expecting a seal to pop somewhere or a corroded brake pipe but no leaks and certainly no loss of fluid.

I haven't yet explored the possibility of a brake valve failing if there is one, if not then the master it must be.

Check the plastic pipe from the brake servo as these tend to break through age or if its come apart.

8th February 2021, 18:26	#7
Ched I really should get out more....... MG ZT V8, MGZT 135 derv ,MG TF 135 Join Date: Dec 2011 Location: Romsey Posts: 2,293 Thanks: 553 Thanked 573 Times in 385 Posts	I have the exact same problem in my 190 that is being recommissioned. It was working fine then a couple of days later pedal to the floor, as the car had been parked for a number of years I was expecting a seal to pop somewhere or a corroded brake pipe but no leaks and certainly no loss of fluid. I haven't yet explored the possibility of a brake valve failing if there is one, if not then the master it must be. Check the plastic pipe from the brake servo as these tend to break through age or if its come apart.