[W126 Coupe] Brakes and air

[Ronny 560sec]

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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