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914World.com _ 914World Garage _ Master cylinder leak repair question

Posted by: Marty Yeoman Jul 2 2016, 12:27 PM

The plastic lines from my brake fluid reservoir to the master cylinder have started to leak at the master cylinder grommets. When I replaced/upgraded to a19mm (a while ago) the grommets came installed.What do I need to know for the repair. Can I R&R them without breaking into the pressure side of the system? Should I just plan on pulling the MC as I'll need to bleed the system anyway?Thoughts anyone? I'm not looking to make this more than it needs to be.

Posted by: era vulgaris Jul 2 2016, 12:36 PM

Did you install the two washers that should've come with your MC under the grommets?

Posted by: Marty Yeoman Jul 2 2016, 12:44 PM

Don't remember, It's probably been at least five (maybe ten) years since the install.

Posted by: BeatNavy Jul 2 2016, 01:50 PM

I would imagine you MIGHT be able to do it without having to rebleed the brakes. In theory. But getting those grommets in is a real PITA. Doing it with the MC attached is tough, although if you pulled the fuel tank I suppose it's possible, IIRC. And yes, you need those two washers.

Posted by: Marty Yeoman Jul 2 2016, 02:40 PM

Sounds like its going to be a "While I'm in there." sort of thing.

Posted by: Marty Yeoman Jul 2 2016, 07:29 PM

Exactly what service do the washers perform? I see them in both the Haynes and Lash manuals but without any mention in the text. Are they intended as end of travel stops for the reservoir tubes?

Posted by: Marty Yeoman Jul 8 2016, 08:49 PM

Update:

It just seemed best to pull it all apart and repair it correctly. I ended up pulling the gas tank, master cylinder, reservoir and feeder lines. I installed new lines and grommets onto the master cylinder and fed them through from below (I bet the factory took the same approach.). Then new bulkhead grommets, connecting tubes and the reservoir tank all from above. It all went together easily without much hassle. I reinstalled the gas tank,
bled the system and done.

Posted by: BeatNavy Jul 9 2016, 07:07 AM

Nice work, and good to have done!

Getting those feed lines seated into the MC is not easy, right? I'm not sure if it would be feasible with the MC and fuel tank still in...

Posted by: mepstein Jul 9 2016, 07:25 AM

QUOTE(Marty Yeoman @ Jul 2 2016, 09:29 PM)

Exactly what service do the washers perform? I see them in both the Haynes and Lash manuals but without any mention in the text. Are they intended as end of travel stops for the reservoir tubes?

Washers need to be there or the lines will leak.

Posted by: Marty Yeoman Jul 9 2016, 09:23 AM

QUOTE(BeatNavy @ Jul 9 2016, 06:07 AM)

Getting those feed lines seated into the MC is not easy, right?

Actually, they were not hard at all once the unit was out on the workbench. Once there I had freedom to manipulate as needed.