Main.TrailIndexPage | Brake System | Brake Lines & Hoses

Brake Hoses

This component is part of Brake System.


Define the component. Include, if known, the german language word for the component, as well as the English or American equivalent. Show a picture, a diagram.

  • Its technical name & common name(s)
  • part # - start year & end year
  • which area it belongs to - engine, transmission, body, injection etc, link back to the relevant section


Describe, in general terms the function of this component. Meaning what is it there for and what role it plays. Describe how it works, the inside mechanism. Use diagrams to explain.


Describe common maintenance procedures, and common faults that may occur. Describe how these may be diagnosed and resolved. Again, include diagrams, photographs and explanations. Where possible, include measures, tolerances, weights etc.

  • Symptoms when it faults
  • How to test if it is faulty - what tools to use
  • How to fix / change

Link to related components where appropriate.

Brake Lines

There is a difference if you have an early car or Girling brakes. But for 250 and 280SL, the two hoses for the front are identical and carry ATE Part number 83.7704-0421.3 Each of those has one male, one female end, length specified as 420mm.

The Right rear hose carries part number 83.6104-0220.3 and this has one male and one female end. The Left rear hose carries part number 83.6204-0240.3 and this has two female ends because it threads directly into the proportional valve body. Both rear hoses are specified as 220mm.

You can find the data on the hoses in the ATE Classic Catalog which is here:

Old Yahoo content

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I was just wondering if anyone has had any luck with the double (bubble) brake flaring tool and where they got it. The brake lines for my 280 SL supplied by MB are too long.

I use the Snap-On Metric Double Flaring Tool Kit #TFM5. It works very well. I have found that Mercedes tubing is hard. And is therefore hard on the tool. Use plenty of anti-seize lubricant on the threaded screw portion of the tool and where the flaring tip and tubing meet. Practice on some spare tube first.

Brake hoses have a limited lifespan (less than 10 years). They are date stamped (if they are the real, original thing). After that they get clogged up, brake power reduces and your brake cylinders cannot move (i.e. you can't brake, or the other way round, the pads don't move off the brake your brake pads will wear quickly with smoke and heat).
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