[W126 Coupe] Brakes and air

[Markus Meyer]

Just happened to me on one of my cars. Turns out there was a minor leak in
the line to one of the rear calipers that I found at the connection between
metal and rubber lines.

On Dec 20, 2010 3:02 PM, "Ronny 560sec" <ronny.geenen at verizon.net> wrote:

> Just another idea about the brake problem.

> Is it possible that the ABS system has to read the system to kick in.

> Does it mean that the car has to run to find that out, because another guy

told me he had that experience with a Ford.

> I just was in the garage and sat behind the wheel. The brake pedal was

very firm. I started the engine and put it in drive and the brake pedal get
softer and went slowly down. When I started pumping the pedal came a little
up.

>

> Ronny

>

>

>

> From: mbramel

> Sent: Sunday, December 19, 2010 12:57 PM

> To: 'Mercedes Coupes Mailing Lists'

> Subject: Re: [W126 Coupe] Brakes and air

>

>

> Couple years ago I had bought one of those mityvac units to bleed the

brakes. First time I used it I guess I went a little overboard. Sucked all
the fluid out of the lines. Then I filled the reservoir back up. Tried
pulling the fluid through and I couldn't get anything? Tried the pumping
method, that didn't work. And that took hours. Bought one of the motive
bleeders from jegs for $50. Lines were done in 10 minutes for all four. Best
$50 I ever spent. Good luck. Had to put a new MC on too because of all the
pumping. But, looks like everyone has their own experience

>

>

>

>

>

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>

> From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]

On Behalf Of Ronny 560sec

> Sent: Sunday, December 19, 2010 2:54 PM

> To: Mercedes Coupes Mailing Lists

> Subject: Re: [W126 Coupe] Brakes and air

>

>

>

> Jay H wrote:

>

> Do not know why you do not try the simple and fool proof way of bleeding

lines

>

> Jay, believe me we will try all the advices I received from all at the

mbcoupes.

>

> I printed all the emails, also your 5 points of steps.

>

> As soon as the problem is solved I will report that to you and all the

others.

>

>

>

> Ronny

>

>

>

> From: Michael Ramay

>

> Sent: Sunday, December 19, 2010 10:58 AM

>

> To: Mercedes Coupes Mailing Lists

>

> Subject: Re: [W126 Coupe] Brakes and air

>

>

>

> The check valve in the middle of the 1/2" vacuum line from the engine to

the brake booster is the normal failure point. Once that cracks/breaks and
vacuum is gone, the pedal goes from the normal "kinda firm" to "Rock F'g
Solid". A guy (LARGE guy) with both feet on the brake pedal *might* be able
to get the car to stop. My 5'2" wife has no chance.

>

> FYI, this check valve is a part that should be looked at at least once a

year to see if the plastic is starting to look chalky. Doesn't hurt to
wiggle it a little bit too. IIRC, it's about $30 for the black tubing with
the check valve in there.

>

> On Sun, Dec 19, 2010 at 11:46 AM, Jay Hirsch <J.Hirsch at mac.com> wrote:

>

> On "normal" cars, to me which is most American cars if the power booster

has a "leak" the brake is very hard or firm, and stays that way the more you
apply pressure, something we all wish at various times

> Will not comment on the 560 power booster but assume all brake systems are

the same....spongy pedal either air in the line or fluid leak some where.

> Do not know why you do not try the simple and fool proof way of bleeding

lines

>

> Jay H

> On Dec 19, 2010, at 1:05 PM, Ronny 560sec wrote:

>

> Jason,

> I thought that when there is a vacuum leak the brake pedal will stiffen!

Or am I wrong.

> Meanwhile I will ask my mechanic to check that line too.

>

> Ronny

>

>

>

>

>

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>

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>

>

>

>

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>

>

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