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> Rebuiding Inside-out
ndfrigi
post Mar 29 2022, 09:10 PM
Post #4921


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QUOTE(raynekat @ Mar 29 2022, 08:04 PM) *

Whew....he's back.


yup finally he’s back!
1st time his thread with days or weeks with no update. I do like this thread with so much details!
This car should be on the road soon!
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Cairo94507
post Mar 30 2022, 07:36 AM
Post #4922


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I have been eagerly awaiting updates. But a grandkid comes first. (IMG:style_emoticons/default/beerchug.gif)
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bkrantz
post Mar 30 2022, 08:13 PM
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Sorry for the wait, guys. Getting my wife away from the new grand baby was tough. Then I found out she committed us to return. In July. In Tucson. Yikes!
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bkrantz
post Mar 30 2022, 08:15 PM
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OK, back to work. After confirming that the new MC pressure warning switch works, I decided to install it.


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bkrantz
post Mar 30 2022, 08:17 PM
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Here's the new MC with the original i.e. 50 year old switch installed.

I did find out that when I removed the old switch, the MC does not leak fluid. Maybe I will not have to bleed the system again! (IMG:style_emoticons/default/cheer.gif)


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bkrantz
post Mar 30 2022, 08:23 PM
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So I swapped the new switch in, after confirming again with my multi-meter that it works. But when I connected the leads and turned on the ignition, the damned warning light was still flashing. ARRRGGGHHH. (IMG:style_emoticons/default/headbang.gif)


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bkrantz
post Mar 30 2022, 08:26 PM
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After falling around with the 3 switches (original two connection, new two connection, and new single connection) I decided to get out the original MC and learn more.

I unscrewed the cap for the warning system bore, and pulled out the piston.


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bkrantz
post Mar 30 2022, 08:33 PM
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As I understand the function, as long as pressure for the front and rear circuits is equal, the piston remains centered, and the plunger on the switch can be fully extended, poking into the smallest diameter segment on the piston (with some red marker). If the pressure is unequal, e.g. if the front or rear circuit loses fluid, the piston shifts and forces the plunger into the switch, making the connection.


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bkrantz
post Mar 30 2022, 08:38 PM
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With the piston back in the old MC, I installed the new switch and it works.

Back on the car, I confirmed that both front and rear brakes work. But as best as I can tell, the warning piston is not centered, so as soon as I screw the new switch in, it pushes in the plunger and turns on the light.

More figuring to do.
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Puebloswatcop
post Mar 31 2022, 07:30 PM
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whew,

Glad you're back. I was turning a very dark shade of blue from holding my breath with anticipation. Welcome home and congrats again on the new grand baby....
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bkrantz
post Apr 1 2022, 07:19 PM
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QUOTE(Puebloswatcop @ Mar 31 2022, 07:30 PM) *

whew,

Glad you're back. I was turning a very dark shade of blue from holding my breath with anticipation. Welcome home and congrats again on the new grand baby....


Thanks. Gotta love the next generation. Hope your O2 is recovering.
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bkrantz
post Apr 1 2022, 07:23 PM
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I tried again to get the brake MC warning system to reset.

I used a thin, sharp probe to see if I could manually shift the warning piston--no luck.

I opened first a front, and then a rear caliper bleeder, and stomped on the brake pedal--no luck.

Running out of options before I have to replace the (new) MC.
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bkrantz
post Apr 2 2022, 09:39 PM
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OK, time to dig deeper into the MC (without removing it). First, remove brake fluid from the reservoir.


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bkrantz
post Apr 2 2022, 09:41 PM
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Next, remove the cap that covers the secondary bore for the pressure warning piston.


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bkrantz
post Apr 2 2022, 09:42 PM
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Next, remove the warning piston. Note this shows the piston with its end cap removed. But the piston hits the front suspension cross member.


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bkrantz
post Apr 2 2022, 09:46 PM
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I loosed the MC retaining nuts enough to tilt it down so the piston cleared the cross bar.

Here is (from left to right):
cylinder end cap
tiny retaining C-clip
forward spring perch
rear spring perch
warning piston

Notice something missing?


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bkrantz
post Apr 2 2022, 09:47 PM
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Here's the piston from my old MC (top) compared to the new one, which is missing the spring. Probably not a good thing.


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bkrantz
post Apr 2 2022, 09:48 PM
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Comparing old and new MC.


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bkrantz
post Apr 2 2022, 09:50 PM
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Measuring the depth of the warning switch location, from the mounting face on the outside to the bore wall inside.


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bkrantz
post Apr 2 2022, 09:50 PM
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On the old MC it measures about 1.04"


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