 Reset Master Cylinder Warning Piston? |
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| bkrantz |
 Mar 30 2022, 08:46 PM
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#1
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914 Guru  Group: Members Posts: 7,791 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains 
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Seems like the small diameter piston that triggers the brake fluid pressure warning light in my new MC is not centered, so the small diameter segment is not aligned with the hole for the switch plunger. This photo shows the piston removed from my old MC.
Does anyone know how to reset or recenter the piston in the MC? (not reset the plunger on the switch) |
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| robkammer |
Apr 3 2022, 12:34 PM
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#2
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Member Group: Members Posts: 179 Joined: 7-January 21 From: Vermilion Ohio Member No.: 25,049 Region Association: North East States |
Can I could jump in the middle here with a question? My new MC of 1 year has been leaking through the switch and a replacement was sent. Waiting on a new washer. I just noticed that there is a small rubber cap on the plunger of the new one. Looked at the old one and it had one as well. Should I have removed this before putting the boot on?
And with a plastic plunger and only one wire at the switch, how does it complete the circuit? There is a lot of black tape on the wire at the boot so I may yet another old hack to deal with. Rob |
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| GregAmy |
Apr 3 2022, 02:08 PM
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#3
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Advanced Member Group: Members Posts: 2,311 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
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QUOTE(bkrantz @ Apr 2 2022, 11:57 PM)  Remember, this is a brand new MC. Not good. QUOTE(robkammer @ Apr 3 2022, 02:34 PM) My new MC of 1 year has been leaking through the switch... There should be no fluid in that center chamber where the switch is. Look at the photo above; see how there's a seal on each side of it? Fluid in that center chamber indicates a leaking seal. I had that same exact problem with a "new" master cylinder last Fall. Vendor sent me a replacement. Might be time for us to identify a good quality MC repair kit and rebuilt known-OE ones. Greg |
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| robkammer |
Apr 3 2022, 05:02 PM
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#4
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Member Group: Members Posts: 179 Joined: 7-January 21 From: Vermilion Ohio Member No.: 25,049 Region Association: North East States |
QUOTE(GregAmy @ Apr 3 2022, 04:08 PM) QUOTE(bkrantz @ Apr 2 2022, 11:57 PM) Remember, this is a brand new MC. Not good. QUOTE(robkammer @ Apr 3 2022, 02:34 PM) My new MC of 1 year has been leaking through the switch... There should be no fluid in that center chamber where the switch is. Look at the photo above; see how there's a seal on each side of it? Fluid in that center chamber indicates a leaking seal. I had that same exact problem with a "new" master cylinder last Fall. Vendor sent me a replacement. Might be time for us to identify a good quality MC repair kit and rebuilt known-OE ones. Greg Thanks Greg. I think. So if I understand correctly, the new 914 rubber ez install MC is leaking where it should not? I wish I would have saved the old mc or at least pulled it apart so I had a better feel for how it's put together. When I talked to Mark at 914R about the switch he didn't hesitate to send a new one, but if what you're saying is true then I'm stuck with the chinese EZ MC and that could be the source of my less than ideal braking. Huh. |
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Posts in this topic
bkrantz Reset Master Cylinder Warning Piston? Mar 30 2022, 08:46 PM
bkrantz Bump.
Eric @Eric_Shea , do you have any suggesti... Mar 31 2022, 03:53 PM PatMc
Seems like the small diameter piston that trigger... Mar 31 2022, 05:41 PM bkrantz Thanks. I tried prying, and then pressing on the ... Apr 1 2022, 07:27 PM GregAmy There's springs on either side to center it...... Apr 1 2022, 08:14 PM bkrantz See my build thread for more details, but I ended ... Apr 2 2022, 09:57 PM bkrantz The second problem is that the distance from the i... Apr 2 2022, 10:01 PM
bkrantz That's right. There should be no brake fluid ... Apr 3 2022, 06:58 PM
robkammer Mark called me back yesterday and feels it may be ... Apr 5 2022, 09:18 AM |
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