Sprinter 312 Brake Problem - HELP !

[Hammer1164]

B]HELP!.
I have a 1996 312 Sprinter with 169k. Last few months spongy brakes-to, nearly No Brakes! in 1 week. Bleed System, air from osr, & nsf, but no fluid loss.
Two days later, brakes start going soft again, bleed system, air again, but no fluid loss from m/cyl!.
And so on every week or so, Its driving me Mad!

Anyone got any ideas PLEASE!
[/B]

 

[tom7035]

Sounds to me like a brake master cylinder fault.

 

[Hammer1164]

Hi
Changed Master Cylinder about 14 months ago. Do they go that quickly?

 

[tom7035]

Wouldn't think so. Only can be one of two things then IMO, air in the system which you haven't purged properly, or a fluid leak. I would start with bleeding again - start with the longest pipe run first and work progressively to the shortest. See if there's any improvement. Check all the wheel cylinders for signs of wetness too.

 

[HORBERRY123]

Had All The Sames Problems, Bled The Brakes Changed Master Cylinder. Problem Would Come And Go, Eventually Found Siezed Rear Brake Pad, Which Meant The Disc Would Flex From The Pressure From The Other Side GOT NEW PADS which were Very Tight, so i filed Them To Fit And and used copper slip....................now Theyre Sorted!: