Master Cylinder Replacement Challenges, Reservoir Lines and Single Pole Contact Options

[DennisV]

I've run into a couple challenges while replacing our brake system.

The new master cylinder has a single pole contact, whereas the original had 2-pole. I read somewhere that you just leave one wire detached. Do you lose some functionality doing that?


I am having a hard time getting the plastic lines that run to the fluid reservoir to naturally land in a position where they would connect. The old lines appear to be identical to each other. Whereas the new lines are different from each other with different part numbers found in the factory parts catalog. Has anyone else run into this? These came from Porsche and I triple checked the numbers on the bag against the catalog. I inserted them into the master cylinder per the indication of the factory parts catalog. I have done all sorts of twisting and contorting but would have to bend one of them substantially to get them to align with the reservoir hoses.


Thank you.

[87m491]

I just went through this trying to track down some braking issues. Have literally had my MC in and out over half a dozen times last 2 weeks. In the process I finally broke one of the Nylon MC fluid feed lines. I think it was just as well since they had taken such a set after 50 years that I had to pull the tank to run them back up to the reservoir. Let me say that Tygon vinyl tubing from NAPA is your friend here. Resistant to all petrochemicals and brake fluid. Way cheaper than hard nylon replacements, More flexible than a rubber band and will fit through the body panel grommets without collapsing and save tons of cursing and you can fish it easily around an installed gas tank.

Now, on aligning the feed pipes below the car from the MC. My short, hard lines at the MC were symmetrical and I believe factory vs yours that are clearly different from each other. Because I'm still running 1 factory nylon feed line I also had to "crisscross" mine like seen in the parts catalog to get them to better line up with the body holes. When i swap in another Tygon line, I'm sure this won't be an issue.

My switch connector was capped off to one connector decades ago by the PO and brake warning works fine.


(IMG:http://www.914world.com/bbs2/uploads_offsite/i.imgur.com-14731-1692108349.1.jpg)

I've run into a couple challenges while replacing our brake system.

The new master cylinder has a single pole contact, whereas the original had 2-pole. I read somewhere that you just leave one wire detached. Do you lose some functionality doing that?


I am having a hard time getting the plastic lines that run to the fluid reservoir to naturally land in a position where they would connect. The old lines appear to be identical to each other. Whereas the new lines are different from each other with different part numbers found in the factory parts catalog. Has anyone else run into this? These came from Porsche and I triple checked the numbers on the bag against the catalog. I inserted them into the master cylinder per the indication of the factory parts catalog. I have done all sorts of twisting and contorting but would have to bend one of them substantially to get them to align with the reservoir hoses.


Thank you.