As may of you know we are in the process of producing master cylinders. Unlike some vendors with impeccably clean "Laboratory " complete with Periodic table. This is how we get things done.

Phase 1
We have a test bed that simulates braking, and are looking to see where our weak points are. We will put no less than 25,000 cycles on this part. This will take awhile as we can only get about 200 at a time without the motor heating up, but believe this to be a very rigorous test.

Phase 2
If we make it to 25,000 we will start measuring output from the pressure lines. This will be thoroughly broken in system we will be testing, not just testing with air pressure.

After the final round of testing we will tear it down to determine wear on critical components and examine the seals to see how well they have held up. If they show excessive wear we will look at improvements that may need to be made. Especially so if we don't make 25,000.

My only serious concern is that the metal on the test stand may fatigue making us repair it before we hit 25,000 cycles. We are currently a little less than 5000 cycles.

I thought I'd share this as many of you don't realize what we do behind the scenes t o actually make the parts we all need.

https://youtu.be/UskyAeVAF9Y

https://www.youtube.com/watch?v=UskyAeVAF9Y

How about you put some aluminum fins on the motor and put a fan flowing on it? Also maybe one of those home timers that can cycle something every 15 minutes so its not pumping for hours at a time? Your going to create heat that the MC was never designed for.

Love it!

Well, at least the flexing of the stand helps replicate the flexing of the body over these 40 something years of use.

Thanks for sharing the testing video.

I have a few spare wiper motors...
Can you say "Electronic Power Brakes"?

Your test devise sounds like my heart when I wake up in the morning.

That's a really boring video. Maybe if you had a girl in a bikini fanning the motor it would liven things up.

Elliot "Jarvack"

We actually thought about the additional heat, knowing that this would exceed normal use is actually a plus for us. Also one of the reasons we wanted to do an analysis of the unit after the test.

We may also go to a larger motor and let it run til it fails. The kill switch is the brake warning switch. Although I'm pretty sure the stand would fail 1st.

Probably a more vigorous testing setup than the industry standard and thousands of dollars less in costs.

Move this thread to the sandbox and I'll post some photos of machine that will work the brake back and forth much faster.

I love it. Good engineering is the exercise of creatively solving a problem, not necessarily spending a ton of money to solve a problem. Or at least I think I remember hearing that in an episode of McGyver.

Awesome, but needs over dub with porno music and sound effects.

Yes Brown chicken brown cow

I think you are going to metal fatigue the pedal set housing based on the amount of flex that is happening. Support at the master cylinder will reduce that.

Figured I'd see what broke 1st.

My experience with not just our 914 Master cylinder but in general is they don't fail because of use, they fail because of disuse. The sit with the piston in one place for long periods and it results in corrosion, particularly if the system isn't bled in a timely manner.

As for posting this in the Sandbox, someone's been watching too much porn...

Is this thing still chugging away or did something break?

Not sure appears some (URO) last a shorter time,nothing wrong with this test IMO and nice to see someone doing it...appears some don't bother...did I mention that before

Broke somewhere around 10k. The weld broke. Kept cycling but not a full pressure as the plate flexed at the weld.
The EURO one I put on my car lasted 5 cycles.

Your testing is 100% unrealistic and not related to any 914 known to man...





I don't a single speck of rust anywhere.

https://www.youtube.com/watch?v=/lt-udg9zQSE

Awesome to see, and great backyard engineering!