Readily available brake cylinders

1959 - 1978, M151, M151A1, M151A2, Technical questions and discussions, regarding anything related to the M151.
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Gunbunny198
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Readily available brake cylinders

Post by Gunbunny198 » Thu Jun 20, 2019 6:02 pm

Has anyone found a brake cylinder available at local parts stores that will work on the 151s? I know they are available but looking for immediate as I may need a new one. Thanks in advance,

Paul

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Re: Readily available brake cylinders

Post by artificer » Thu Jun 20, 2019 6:40 pm

I would recommend replacing not 1 but a minimum of 2 on the front, or 2 on the rear but more preferably all 4. viewtopic.php?t=97921
John GIBBINS Member Institute of Automotive Mechanical Engineers [Ret], ASE Master Medium/Heavy Truck & Auto Technician USA -2002 Licensed Motor Mech NSW MVIC 49593 Current 2015
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
Understand how system parts interact with one another. GOOD parts can then be established & the NOT GOOD problem/s part/s isolated for repair or replacement.

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Re: Readily available brake cylinders

Post by Rickf » Fri Jun 21, 2019 8:18 am

On that note, When I restored mine 7-8 years ago I replaced everything with new parts. Master and wheel cylinders. Metal and rubber lines. I do not use it all that much, if it get 250 miles a year that is a lot. I went into town the other day and when coming to a stop I let off the brake as I was slowing down and immediately I could tell one brake was not fully releasing and then it let go after a second or so. So for the next few stops I paid attention to the attitude of the vehicle and I could tell it was the left front. By the time I got home this had all stopped but I am planning on replacing the brake hoses and dissecting the ones that come off to see what is going on since these were new 8 years ago. Granted, the hoses were probably older than that but they are still soft to this day. Never take NOS parts for granted, they are still old parts.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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Kurt Lesser
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Re: Readily available brake cylinders

Post by Kurt Lesser » Sun Jun 23, 2019 8:48 pm

Can't recall 100% but I think the 151 and A1 cylinders are different from the A2s and the fronts and rears are also different. Could someone on the forum confirm this for Gunbunny?
Kurt Lesser
US Navy, 1969-1975
M996A1 Ambulance w/M101A3 Trailer
M274A2 Mule
M151A1 Mutt w/M416B1 Trailer
M890 Crew cab

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Re: Readily available brake cylinders

Post by artificer » Sun Jun 23, 2019 9:41 pm

Front & rear are different diameters:
1" front & 3/4" rear, I believe:
https://www.ebay.com/p/Jeep-Military-Fo ... 1289589672
John GIBBINS Member Institute of Automotive Mechanical Engineers [Ret], ASE Master Medium/Heavy Truck & Auto Technician USA -2002 Licensed Motor Mech NSW MVIC 49593 Current 2015
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
Understand how system parts interact with one another. GOOD parts can then be established & the NOT GOOD problem/s part/s isolated for repair or replacement.


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Re: Readily available brake cylinders

Post by Rickf » Mon Jun 24, 2019 9:36 am

A1 and earlier use 3/4 all around and A2 uses 1" front and 3/4" rear. I converted my A1 to the 1" front and could be be happier. Not a week after I did it I had someone cut in front of me with inches to spare and I had to hit the brakes HARD! An A1 would have swapped ends due to equal braking at all four BUT heavy front end, so rears would have locked up. We all know what happens when an M151 gets sideways on pavement. :roll: :cry: But the fact that I had the 1" in the front the fronts held harder than the rears and the rears did NOT lock up first and it stopped straight as an arrow. Now I know everyone will point to the bulletins that say to NEVER, EVER put A2 cylinders on an A!. The reason for this is because Private Joe at the motor pool does not own the A1 and probably does not have a clue as to what the difference is between the cylinders nor does he care, so he slaps them on in any position just like he has done for years on the A1 since they are all the same right?! Therein lies the problem, you end up with a 1" on te left front and a 3/4" on the right front and when the brakes are hit hard you make an immediate right turn. If done CORRECTLY they are perfectly safe, 1" on BOTH front wheels and 3/4" on BOTH rear wheels.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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Kurt Lesser
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Re: Readily available brake cylinders

Post by Kurt Lesser » Tue Jun 25, 2019 9:19 am

Thanks Rick! Good info.
Kurt Lesser
US Navy, 1969-1975
M996A1 Ambulance w/M101A3 Trailer
M274A2 Mule
M151A1 Mutt w/M416B1 Trailer
M890 Crew cab

Gunbunny198
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Re: Readily available brake cylinders

Post by Gunbunny198 » Wed Jun 26, 2019 5:52 pm

Thanks to all that have given insight and knowledge. I had to order a set as all local parts store wither didn't have them or wanted double the price of what could be found online. I think I will however upgrade to the 1in in the near future as it makes perfect sense.

Paul

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Re: Readily available brake cylinders

Post by W. Winget » Wed Jun 26, 2019 6:53 pm

Why not just insert new cups? Are the cylinders scored or rust pitted?
Cups would cost around $5-10 at NAPA.
V/R W Winget
Looking for 1918 Standard B 'Liberty' truck parts

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