Definitely master cylinder failure symptoms.  Fluid is leaking past the cups on 
the piston.

Dan


> On Jun 11, 2015, at 2:36 PM, Randy Bennell via Mercedes 
> <mercedes@okiebenz.com> wrote:
> 
> Winnipeg has rivers going north south - The Red and east west - The 
> Assiniboine so I thought that sort of fit.
> 
> My good old 76 115 300D had a hiccup this morning, which is totally unlike it.
> 
> I was at a light when the car creeped ahead. I thought I had a senior moment 
> and had failed to keep my foot firmly planted on the brake.
> I stepped harder and it sat there for the duration of the  red light, but on 
> the next block, I stepped on the brake pedal and it essentially sank to the 
> floor. Not a good thing in traffic.
> I drove it the few blocks home at lunch and put it back in the garage but 
> something is wrong. It brakes but not very hard and pumping the pedal does 
> not all that much to make it better.
> 
> It feels like when one presses on the pedal while another bleeds the brakes. 
> It just slowly descends until close to the floor.
> 
> I have looked where it was parked and do not see any puddles of fluid.
> The resevoir does not look to be down.
> 
> I shall have to look a bit closer to see if there is something leaking.
> 
> If not, then I suspect the master cylinder is leaking internally.
> 
> Anyone have a better conclusion based upon the symptoms?
> 
> If so, is there a kit to repair or am I compelled to replace the whole thing?
> In either case, where would one best look for parts?
> 
> RB
> 
> 
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