Kurt –
If it ain’t broke, don’t fix it. Just replace the leaking cylinder. Also, DOT 3 is indeed hygroscopic. That’s a good thing. Leave it as DOT 3, unless you are planning to replace the *entire* brake system. You’ll be doing a flush when you replace this leaking cylinder. Going forward, just change your fluid every three or four years and you’ll be fine.
Ron
From: chrysler-300-club-international@xxxxxxxxxxxxxxxx On Behalf Of Kurt Brueske
Sent: Tuesday, May 27, 2025 4:15 PM
To: Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: {Chrysler 300} Wheel cylinder replacement advice
I could use some advice on whether I should replace all four wheel cylinders or just the cylinder that is leaking? Full disclosure this is for my ‘64 Imperial Crown Coupe, not a letter car, but figured the advice would also be beneficial to letter car owners as well.
I discovered the driver side rear is leaking and set out to replace ALL the wheel cylinders as a “preventive measure.” When I checked the condition of the other three cylinders, they all appear fine but I suspect they’re old - “Wagner Lockheed - Made in USA” is stamped on the housing and we all know how few automotive parts are made domestically these days.
Question: should I “leave well enough alone” or is there some benefit to replacing all four at once besides knowing they’re new?
I suspect hygroscopic DOT 3 brake fluid was previously used and the car sat for the better part of 20 years…some clumpy viscous residue in the bottom of the master cylinder. I was thinking replacing all four wheel cylinders would aid in a brake fresh and upgrade to DOT 5.
I appreciate the feedback and help.
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