Hissing noise from brake pedal on my ml270

[andymc5894]

Hi
Ive just recentely bought a 2003 ml270.
I have noticed there is a hissing noise coming from the brake pedal when depressed.
A garage has told me that it is possibly a diaphragm on the servo that has split and that the servo needs replacing,which will be a costly repair.
Is there any way that the diaphragm itself can be replaced rather than the whole servo unit ?
Is it dangerous for the car to be driven with this fault ?
Andy

 

[television]

Does the pedal go hard if you keep your foot on the brake pedal

 

[Moonboy]

Hi
Ive just recentely bought a 2003 ml270.
I have noticed there is a hissing noise coming from the brake pedal when depressed.
A garage has told me that it is possibly a diaphragm on the servo that has split and that the servo needs replacing,which will be a costly repair.
Is there any way that the diaphragm itself can be replaced rather than the whole servo unit ?
Is it dangerous for the car to be driven with this fault ?
Andy

Sorry to hear this, i have the same problem, and just researching it, just found this repair video on youtube

Seal kit £80 as a diy repair hope it helps someone