[W126 Coupe] Brake Master Cylinder

[samsisic at comcast.net]

Thanks Dick and Markus! Will do...
Not sure what you mean by "build-up" under the booster?
Are you talking about the cavity area between the two fire walls?
Build-up of leaves and debris?
Sam


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

> 

> Message: 7 

> Date: Mon, 30 Jun 2008 17:27:48 -0400 

> From: Dick Spellman 

> Subject: Re: [W126 Coupe] Brake Master Cylinder 

> To: Mercedes Coupes Mailing Lists 

> Message-ID: <48694FD4.8060805 at verizon.net> 

> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" 

> 

> Hi Sam, 

> 

> I am a proponent of flushing all the sludge and moisture laden brake 

> fluid on the lines using a pressure bleeder set to 30-35 lbs every two 

> years. If this has never been done, I recommend you replace both rubber 

> pressure caps on the brake fluid reservoir first. After 10 years they 

> crack and doing a pressure bleed will let you know this in short order 

> and makes quite a mess. 

> 

> I should also mention that at or about 15 years, in my limited 

> experience the rubber brake lines to the calipers tend to start swelling 

> from the inside causing undo braking action once things heat up. So, if 

> in doubt, rip these out and replace while you are doing the system. 

> 

> As for the master cylinder, it's a straight forward replacement. A 

> couple of comments. Once the old one is removed, inspect inside and 

> down for any signs of build-up with a flashlight. If the build up has 

> risen to where it's in contact with the booster diaphragm you may need 

> to replace the booster sooner rather than later. Assuming the build-up 

> has not made it to the rubber diaphragm, just slide the master cylinder 

> in directly with no angle to get it to seat without damage. 

> 

> Take care, 

> 

> Dick 

> 

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