[W126 Coupe] Strange Fault (& fix)

[Attila]

                There is no co-relation between the two.  Check the vacuum
line from the 

brake-booster to the intake manifold (lower plenum).  Great big plastic

thingy.  If that is good, put vacuum gauge on main vacuum line and see if

it holds.  Yours very drunk in Florida.  If the car was here, I could find
it in

no time flat. Sayonara. 

 

From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of Vance Rowley
Sent: Saturday, June 11, 2011 10:33 PM
To: mbcoupes at mbcoupes.com
Subject: [W126 Coupe] Strange Fault (& fix)

 

Over the years, I have had (and heard of) some strange faults on these
wonderful cars. But I can't work this one out.
Here is what happened.
I was driving into town one night (about 8 miles from home) when it started
to rain. As you would expect, I turned on the wipers. They worked for about
30 seconds, then "poof" they stopped just as I was coming up to a red light.
I hit the brake pedal, and it just sank to the floor. Luckily, I had already
slowed down considerably before braking, so with a few pumps on the pedal I
managed to stop OK.
To cut a long story short. Driving very carefully and quite a bit of pumping
of the brakes, I managed to get to my destination and was also lucky the
rain stopped for my return journey home.
Next day, I checked the fuses, and as expected, the fuse that powers the
wipers had gone. I replaced it with a new one, and hey presto, they worked
perfectly. (Nothing strange there I hear you say). I then thought, now to
get to the brake problem. So jumped in the car and set off to my local
garage I use for service and repairs (when I can't be bothered to do it
myself). As I came up to the first junction at the end of my road, I hit the
brake pedal and nearly went through the windscreen. I then did a few tests
up and down my own street and managed to stop on a dime every time. The
brakes worked perfectly with no sign of the pedal sinking to the floor. So I
cancelled my visit to my local garage and nearly 3 months later everything
is still perfect.
Now I can understand the fuse for the wipers going on a 1991 car, especially
as I don't use it that much these days, but can anyone explain to me how the
hell can replacing the fuse for the wipers fix my brake problem as well at
the same time. I just can't work this one out.
If anyone has any ideas or recommendations, I would love to hear from you.
Yours very confused,
Vance
1991 560 SEC Euro.

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