 Brake Master washer |
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| Boomguy |
 Apr 24 2020, 03:18 PM
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#1
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Newbie  Group: Members Posts: 21 Joined: 21-April 19 From: Vancouver bc Member No.: 23,052 Region Association: Canada  |
Would someone be able to tell me what size are the 2 washers (part #901-355-936-00-OEM) are that sit inside the m/c reservoir feed line holes? Do they sit inside the bottom ridge.? Thanks in advance.
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Replies(1 - 9)
| mankowski |
Apr 24 2020, 07:12 PM
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#2
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Member Group: Members Posts: 128 Joined: 7-February 10 From: Portland, Oregon Member No.: 11,335 Region Association: Pacific Northwest |
I thought I had the washers sitting in the old MC I replaced a couple years back to measure, but when I look now, they aren't there, unfortunately. But, yes, they do sit in the bottom of the feed inlet ports.
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| mankowski |
Apr 24 2020, 07:19 PM
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#3
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Member Group: Members Posts: 128 Joined: 7-February 10 From: Portland, Oregon Member No.: 11,335 Region Association: Pacific Northwest |
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| mepstein |
Apr 24 2020, 07:20 PM
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#4
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914-6 GT in waiting Group: Members Posts: 19,276 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region 
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I get them from the dealer. No shipping charges
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| roblav1 |
Apr 24 2020, 08:01 PM
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#5
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Senior Member Group: Members Posts: 528 Joined: 18-September 12 From: KY Member No.: 14,943 Region Association: MidAtlantic Region |
You mean at the banjo fitting? 8mm or 5/16". Copper preferred. I just put a bunch of banjo fittings on my car... Boxster calipers, T banjos at M/C and at rear bulkhead.
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| mepstein |
Apr 24 2020, 08:19 PM
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#6
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914-6 GT in waiting Group: Members Posts: 19,276 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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I’m pretty sure it’s the spacer washer that fits under the metal lines that go into the top of the master cylinder. Leave them out and the fluid will eventually leak out. They usually come with new mc’s or reuse the old ones.
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| Boomguy |
Apr 24 2020, 09:20 PM
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#7
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Newbie Group: Members Posts: 21 Joined: 21-April 19 From: Vancouver bc Member No.: 23,052 Region Association: Canada |
The 8mm x 10mm seems small, is this ridge or shoulder where the washer should fit into? This would elevate it about 2mm from the reservoir supply fittings floor.
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| mepstein |
Apr 24 2020, 09:33 PM
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#8
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914-6 GT in waiting Group: Members Posts: 19,276 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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Yes
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| Boomguy |
Apr 24 2020, 10:32 PM
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#9
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Newbie Group: Members Posts: 21 Joined: 21-April 19 From: Vancouver bc Member No.: 23,052 Region Association: Canada |
Ok I now understand where the washer needs to go, bear with me here. I removed a 19mm M/C out of my car today because ... well it looked like ithad been used as an anchor, previous owner put it in. I have on order a new MC but wasn't sure if it would come with washers so I checked the old one .... none, plus one of the two interior seals was backwards so I know why it looked the way it did. Now I asked my original question because I thought maybe I could find some, somewhere. The 19mm step measured at 14.35mm, in one of my drawers I actually found two washers that fit perfectly (14.25mm). Now when you guys said 8x10mm I thought I had the wrong area for the washer. I dug around and found the original 17mm MC and it did have washers... 13.95mm and confirmed that step in the pic. Now I realize the 17mm is oem and the19mm is aftermarket but there is only one part number from porsche. Sorry for rambling...
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| Mikey914 |
Apr 24 2020, 10:38 PM
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#10
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The rubber man Group: Members Posts: 12,670 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None
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The new Master cylinders come with new rubber, but not washers Got them if you need one
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