Master Cylinder Outer Copper Crush Washer
Fits 41-66 Jeep & Willys

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Master Cylinder Outer Copper Crush Washer
Fits 41-66 Jeep & Willys
New Replacement Master Cylinder Outer Copper Crush Washer (1 required per vehicle)

Goes between your master cylinder and each side of your brass outlet fitting. Ensure a no leak system on your frame mounted master cylinder.

41-45 MB
41-45 GPW
46-49 CJ-2A
49-53 CJ-3A
53-64 CJ-3B
55-66 CJ-5
50-52 M38
52-66 M38A1
46-64 Truck
46-64 Station Wagon
48-51 Jeepster
Item # Price

Availability: In stock

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Questions: What is the thickness of your 637604 and 637606 copper washers?
Question By: Clive Ellis on Jul 20 2019 10:33 PM
Answer By: michael on Jul 22 2019 6:48 AM
Questions: The crush washer description states "1 required per vehicle" When I order the part does it come in a 2 pack? One for each side of the fitting.
Question By: Will on Aug 28 2018 8:04 PM
You need 1 of this part number and 1 of part number: 637604.
Answer By: Willys Jeep Parts Tech on Aug 29 2018 5:23 AM
Questions: So I have new master cyl; new outlet/eye bolt; new brass 'Y' and two new crush washers. Still leaking. The two washers appear to be different inside diameters but the washer with the smaller insider diameter wouldn't fit onto the shoulder of the eye bolt. Should they be the same? Did I mix up one of these crush washers with the new washers for the flex brake lines?
Question By: Cal on Jan 26 2014 12:00 AM
I would double check for any wear on your outlet bolt. You may just need to tighten it up more as well. Also check your brake light switch.
Answer By: Willys Tech on Jan 27 2014 12:00 AM
Questions: Just received two crush washer's for master cylinder...installed and leak's at master cyl flange ....any suggestion's how to stop this...? this is the second set of washer's ...everything else look's ok....
Question By: Anonymous on Sep 3 2011 12:00 AM
Check your torque on it. I would tighten it up and check for any scoring.
Answer By: Willys Tech on Sep 6 2011 12:00 AM