Porsche 914 - Bleeding Master Cylinder in the Car

Porsche 914 MCs use a remote reservoir which makes bench bleeding them on an actual bench a bit messy. This method allows you to "bench bleed" in the car, using the existing reservoir and plumbing. Just open the left front bleeder, attach tubing with the other end submerged in a jar, and pump the pedal with your hand till the bubbles disappear. It helps to have a long enough length of tubing to see what's filling the jar while you're pumping.
Once you've eliminated the bubbles, go ahead and bleed the brakes as usual, using whatever method you like.
I upgraded my MC to a 19mm unit from 914 rubber. Here's a link..
shop.914rubber...
And the install video I made.
• Porsche 914 Master Cyl...
How to bleed the brakes with the Motive pressure bleeder:
• Porsche 914s For Newbi...
Here's the 3/16 tubing I used...100 feet of it for cheep.
www.amazon.com...
Remember, I'm not a professional mechanic and this video is just meant to show you how I bled my own MC. Use this information at your own risk. If you're not comfortable working on your car, please be safe and hire a pro. Especially with brakes!

[@IanKarr]

Thanks so much for watching. If you like these videos, please give a 👍, subscribe and hit the 🔔 . I make these videos alone in my garage and your subcriptions motivate me to keep making them. I try to answer all comments quickly. Be safe and enjoy the addiction!

[@paulsaccomanno2232]

Finally, someone who knows what they are doing. Thanks for your channel.

[@IanKarr]

Thanks, Paul, but I think you're vastly overestimating my competence ;). I'm just a shadetree mechanic who likes to make videos... be safe and enjoy!

[@legotech7]

Those smaller bubbles you see through the clear tube at the caliper fitting is because there is air creeping through the fitting. You'll never bleed it properly if you don't keep the fitting threads from sucking in air, and the clear tube very tight on the fitting..

[@IanKarr]

Yep. Air creeping around the bleed screw threads is a thing. It doesn't really suck into the caliper...just seeps from the threads into the bleeder / line. Especially when pressure bleeding, like I usually do. Thanks for making the point!

[@RobertSmith-os2zj]

Thanks for the video . I’m installing the 914 rubber ez MC tomorrow. I’m just hoping the calipers will function.

[@IanKarr]

Is your current MC bad / out?

[@stevenhenry8743]

I did this process a few times, but I still have a spongy pedal. It goes all the way to the floor but still stops. Could my MC be bad?

[@stevenhenry8743]

I meant the car still stops..

[@IanKarr]

Possible, but it sometimes takes several bleeds to get all the air out. Have you driven the car over a bumpy road or railroad tracks and then re-bled? Did you change your calipers recently?

[@stevenhenry8743]

I’ve bled the brakes four times and the MC once. I did pull off the front calipers with the intention of rebuilding them, but couldn’t get the pistons out.

[@IanKarr]

Steven Henry how are you bleeding? Maybe try the gravity method and see if that helps firm up the pedal

[@stevenhenry8743]

The first two times I used a Motive power bleeder, and the last two I used the gravity method. No matter what I do I can’t get a firm pedal

[@skitaya77]

Do you bleed all the brakes or just on?

[@IanKarr]

When bleeding the master cylinder, you only need to do that through one caliper. Easiest to do on the one closest to the master cylinder (left front). When bleeding brakes, you absolutely need to do them all. From farthest to closest. I have another video on brake bleeding on my channel. Thanks!