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When I learned the inch sizing of the master cylinders many years ago I gave it a lot of thought.jwhillracer wrote:Why did Ate, VW & Porsche use 11/16" and 3/4" master cylinders, and not metric sizes?
Ate MC on order now thanks. I'm going to prep tthe job. ..removing the tank etc. I was really perplexed that the fluid es just push into those grommets. ....presumably okay be a use not under pressure?.!914 KEV wrote:Andy I see you post the same question in more than one place at the same time!
Hopefully here on DDK you will receive a more thoughtful answer from the answer posts!
One thing you didn’t post here is the photo of your master cylinder showing the leaking brake fluid, so I have posted it below.
To me the leak is from the input line(s), either the plastic to metal connector on the end due to rust or the grommet(s) that holds it in place due to them perishing or not pushed fully home the last time the master cylinder was changed!
Lots of good advice already post above and I would like to added from my experience of replacing around a dozen 914 master cylinders over the years.
When I have the job of remove and refit the master cylinder I remove the fuel tank first.
Removing the master cylinder is the easy bit, refitting the input lines back into the new grommets and pushing them all the way home is the hard bit! (New ATE master cylinder will come with the washers and new input grommets that davep mentioned)
The input lines go through grommets in the bulkhead under the fuel tank.
With the grommets removed and the reservoir holder removed or the blue hose connection to the reservoir removed, the input lines can unclipped from the bend over metal holders and then lowered through the bulkhead so you have a lot more room to attach them back into the grommets properly. Once the master cylinder is back in place the grommets can then be refitted. The grommets push in from above and can't be refitted from below.
