Thanks everyone for the advice. After I wiped away grunge from the failed rear cylinder, it was not a Wagner Lockheed unit like the front two…as a matter of fact, both rears were Bendix and pretty grimy. Someone had been in there before as the left threaded drum was on the right and vice versa. I have decided to overhaul the entire system…booster, upgrade to dual vs. single reservoir, DOT 5, shoes, hardware, etc. I’ve spent considerable time opening everything up, might as well go comprehensive and be done for life (at least mine). I found an outfit in Ft Worth TX that specializes in the 8” dual tandem Bendix booster that was used in the Imperial line starting in ‘62:
https://therammaninc.com
Does anyone have experience with them? The person I spoke to on the phone seemed very knowledgeable with decades of experience (Wayne)?
Thanks again!
Kurt
On Tuesday, May 27, 2025 at 3:14:36 PM UTC-5 Kurt Brueske wrote:
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.
Kurt
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