Hydraulic Clutch and Brake Component Rusting

Clutch and brake fluid can be unkind to your cylinders and pistons

Most clutch and brake fluid is alcohol based. That means it can absorb moisture at an alarming rate. The more it is exposed to air the faster the absorbtion. This is the primary reason you should replace your brake fluid every two years (possibly every year if the car is seldom driven and in a high moisture environment). But what about clutch fluid?

Problem & Solution

Common among these chassis:

W110 W111 W112 Sedan
W111 W112 Coupe
W108 W109

Clutch fluid is the same as brake fluid and in many cases it draws upon the same reservoir. I have found that most owners with manual transmissions neglect flushing the clutch fluid. Take a look at the next picture to see what could happen if you don't.


What is the solution? Flush your clutch system every two years with a LMA (low moisture absorption) quality DOT 4 brake fluid. We know the process can be a real pain, but pressure bleeding from the bottom up really speeds the process with less mess.  Pump bleeding hardly ever works very well with clutches. Our pressure bleeder for the brake systems can also work well with your clutch.

Note: I know you manual owners tout about the reliability of the manual transmission, but remember its achilles heal is the clutch!