[W126 Coupe] Brakes and air

[Jason Mavris]

Don't know if this has been mentioned. By I suspect that the Brake Booster 
Vacuum Hose is cracked and this is the cause of your problem.  You might 
check that line. They generally crack right at the oval part on the line 
closet to the master cylinder. If its a hair line crack the brake pedal will 
go to the floor.

Jason
----- Original Message ----- 
From: "Ronny 560sec" <ronny.geenen at verizon.net>
To: <jhodgman at gmail.com>; "Mercedes Coupes Mailing Lists" 
<mbcoupes at mbcoupes.com>
Sent: Saturday, December 18, 2010 5:18 PM
Subject: Re: [W126 Coupe] Brakes and air



> My mechanic replaced today also the master cylinder of my 1987 SEC and 

> used this time the newly bought Motiv pressure bleeder.

> The brakes became firm. They did a test drive and first it start holding. 

> Then they asked me to test drive the car. And when I started I felt 

> directly the soft pedal that went all the way down slowly. Even pumping 

> did not help.

> Since this is happening again I think the master cylinder was OK. And they 

> have used about 2 gallon of break fluid.

> Any idea and advice

>

> Ronny

> Glendora, California

>

>

>

> --------------------------------------------------

> From: "Jonathan Hodgman" <blueridgemb at gmail.com>

> Sent: Thursday, December 16, 2010 10:27 AM

> To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>

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

>

>> Given the age of the master cylinder in Most of these cars, pressure or 

>> vacuum bleeding is the way to go.

>>

>> Also, there are times when air gets caught up in the ABS pump.  I've 

>> found that cycling the key a few times as each wheel is bled eliminates 

>> any trapped air.

>>

>> Jonathan

>>

>>> The MB Coupes Website!

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>>> Postings remain property of MB Coupes, L.L.C.

>>

>>

>> -- 

>> Jonathan Hodgman

>> Blue Ridge Mercedes/AMG East

>> http://www.blueridgemb.com

>> Offering Enthusiast Service, Restoration and Tuning.

>> (404)805-1357

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>>

>> The MB Coupes Website!

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>>

> The MB Coupes Website!

> W126 SEC Mailing List

> Postings remain property of MB Coupes, L.L.C.

>