The Ford Barn

Fordman487 · 06-19-2025, 03:41 PM

I have a 91T-2140 master brake cylinder and need a replacement cap.

Can anyone suggest a source? Although ford lists the 91A-2162 as a replacement, that cap is 1/4" too large. I'm not sure if my master cylinder is a knock off with different dimensions or there were different specs.

If i can't find one, i'll be forced to replace the cylinder. In that situation, can anyone recommend a supplier with a quality cylinder, not a cheap over seas knock off....

GB SISSON · 06-19-2025, 04:40 PM

Maybe with no history on it the time might be right to just replace it. I doubt you'll find a new one that wasn't built overseas, even if it has a USA brand name on it. Some of the early Ford parts have new old stock or new old replacement stock, Good ol' USA, but the rubber parts may be compromised from too many years on the shelf. I just buy new master cylinders at napa. I can pick it up and compare with my own eyes and I have never gotten a bad one.

Terry,OH · 06-20-2025, 06:43 AM

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91A-2162 has an 1.23" outer diameter thread.

06-19-2025, 03:41 PM	#1
Fordman487 Member Join Date: Apr 2016 Posts: 70	Master Brake Cylinder Cap I have a 91T-2140 master brake cylinder and need a replacement cap. Can anyone suggest a source? Although ford lists the 91A-2162 as a replacement, that cap is 1/4" too large. I'm not sure if my master cylinder is a knock off with different dimensions or there were different specs. If i can't find one, i'll be forced to replace the cylinder. In that situation, can anyone recommend a supplier with a quality cylinder, not a cheap over seas knock off....

06-19-2025, 04:40 PM	#2
GB SISSON Senior Member Join Date: Jan 2014 Location: Orcas Island Washington Posts: 5,881	Re: Master Brake Cylinder Cap Maybe with no history on it the time might be right to just replace it. I doubt you'll find a new one that wasn't built overseas, even if it has a USA brand name on it. Some of the early Ford parts have new old stock or new old replacement stock, Good ol' USA, but the rubber parts may be compromised from too many years on the shelf. I just buy new master cylinders at napa. I can pick it up and compare with my own eyes and I have never gotten a bad one. __________________ Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1946 Tonner Pickup with 226 H six, 1979 Toyota landcruiser wagon, now wearing 1947 Ford Jailbar sheet metal. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson)

06-20-2025, 06:43 AM	#3
Terry,OH Senior Member Join Date: May 2010 Posts: 5,188	Re: Master Brake Cylinder Cap Sponsored Links (Register now to hide all advertisements) 91A-2162 has an 1.23" outer diameter thread.