Brakes on an M-151

M151 modifications, sugestions, and ideas, official MWO's and unofficial field mods

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Bucolic
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Brakes on an M-151

Post by Bucolic » Thu Nov 20, 2014 8:59 pm

Has anyone ever converted the brakes on a 151 to disc brakes, AND had them work well???


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Re: Brakes on an M-151

Post by Rickf » Fri Nov 21, 2014 4:37 am

Go over to the g838.org site and ask there. There were some guys in Pakistan that had done it and as far as I can tell it worked all right. Didn't follow the details so I can't really tell you the details but one of the guys from over there has just started posting again so he may be able to help you out.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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Re: Brakes on an M-151

Post by kserumgard » Tue Apr 26, 2016 3:09 pm

Any luck with finding more info on this topic?
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Re: Brakes on an M-151

Post by Rickf » Tue Apr 26, 2016 4:13 pm

Perrini in Italy makes kits to put disc brakes on, along with lockers. Better have deep pockets!
1964 M151A1
1984 M1008
1967 M416
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12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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Re: Brakes on an M-151

Post by kserumgard » Tue Apr 26, 2016 4:16 pm

Hmm, thanks for the info
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Re: Brakes on an M-151

Post by kserumgard » Tue Apr 26, 2016 4:30 pm

I remember reading somewhere about using pajero front hubs and discs brakes on a mutt!?! Can anyone confirm this?
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Re: Brakes on an M-151

Post by Rickf » Tue Apr 26, 2016 4:42 pm

You would probably have to contact the Pakistani members, I believe they are the ones that were doing that. Maybe the Vietnamese but I think they are more into Toyota engine swaps.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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Re: Brakes on an M-151

Post by artificer » Tue Apr 26, 2016 4:48 pm

Suzuki non ventilated discs as have been very successfully used on the G503 [including mine & a write-up] with no vehicle hardware modification other than removing brake drums & backing plates. Absolutely no bending, cutting or grinding anything. Just bolt straight up.
Should be a very simple adapt/fit to the G838, as well.
These late 80's early 90's model Suzuki 4WD are really cheap @ Pick & Pull type places. Make sure to take one caliper mounting bracket off the donor as it will help get the basis for your adapter.

Most important thing to take on board is that the caliper will need offsetting & not vertical, so as not to interfere with anything.
No problems with the rotors & the wheel stud/bolt hole pattern is correct for G503 & G838 wheels

The only major task is getting the adapter right & this can be experimented with using plywood as the basis for a template, until one gets it right then go to your local water-jet place to get the steel or aluminium adapters cut.
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: Brakes on an M-151

Post by kserumgard » Tue Apr 26, 2016 5:07 pm

Great info, thanks a bunch!
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Re: Brakes on an M-151

Post by sjtrucks » Mon Oct 12, 2020 2:11 pm

Re-opening this old thread - disc brake upgrades aside, anyone upgrade the single MC to dual? My friend/mechanic keeps reminding me that all my brakes depend on a single cylinder and in this day/age - we should run something safer (yep, manual tranny and ebrake aside). We have some steep/windy roads here and if I have kids in the jeep, I would feel more comfortable with dual MC.
- SJ

1950 Willys CJ3A
1966 Ford M151
1997 Toyota LandCruiser

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Re: Brakes on an M-151

Post by Rickf » Mon Oct 12, 2020 4:00 pm

I have not heard of anyone doing it. Mounting one is going to be the biggest challenge. If you have an A2 without a voltage regulator then I am sure you could build a bracket to mount a master cylinder out in the engine bay and fabricate a pedal rod to operate it. Then you will need to plumb the lines and decide if you need a proportioning valve. Keep in mind that this is all home made stuff and safety is in the hands of the fabricator. You are not going to find too many people in todays litigious times that are going to tell you how to do it in case it fails and then the lawyers are all over them. Also, depending on the laws in your state you may have to go through a special inspection where all of that will need to be certified and I can tell you from personal experience that that is a brutal run through.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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Re: Brakes on an M-151

Post by sjtrucks » Mon Oct 12, 2020 6:55 pm

Rickf wrote:
Mon Oct 12, 2020 4:00 pm
I have not heard of anyone doing it. Mounting one is going to be the biggest challenge. If you have an A2 without a voltage regulator then I am sure you could build a bracket to mount a master cylinder out in the engine bay and fabricate a pedal rod to operate it. Then you will need to plumb the lines and decide if you need a proportioning valve. Keep in mind that this is all home made stuff and safety is in the hands of the fabricator. You are not going to find too many people in todays litigious times that are going to tell you how to do it in case it fails and then the lawyers are all over them. Also, depending on the laws in your state you may have to go through a special inspection where all of that will need to be certified and I can tell you from personal experience that that is a brutal run through.
Don't have an A2. Fabricating/mods aren't an issue and here in California, they don't care about anything other than smog and this is a pre-1975 vehicle, which means DMV doesn't care about anything other than taking my registration money, every year :D You'd be surprised on stuff-on-four-wheels that I've gotten the DMV to title here :)

I see the M38A1 has an aftermarket dual MC but I am guessing the mounting is completely different from the M151?
- SJ

1950 Willys CJ3A
1966 Ford M151
1997 Toyota LandCruiser

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Re: Brakes on an M-151

Post by W. Winget » Tue Oct 13, 2020 6:28 am

Your guessing correctly, the MUTT has the master between the pedals inside the body, an extension on the neck sticks out through the unitized body to fill it with fluid. So not only is it inside, the push rod is pushing toward the driver (memory here) when the pedal is pushed. It would be easier to add a dual slave driven by the original single master, then unless the short single line failed or seals went out, you would have dual masters to stop the vehicle.
I went down a steep hill in an A1 which blew the middle line, I grabbed the parking brake, but it wasn't very helpful, fortunately I didn't hit anything and another hill was in front of me, so I crawled her out of the woods, crimped off the broken line while straddling a ditch and added motor oil for brake fluid...that oil ruined the rest of the brakes, but I limped home to replace the lines and seals.
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Re: Brakes on an M-151

Post by Rickf » Tue Oct 13, 2020 6:47 am

What it boils down to is as long as you replace all of the lines, both hard and soft, and the wheel cylinders and master cylinder then you will have a completely safe brake system. That new system is going to last longer than you will if taken care of with proper maintenance. I don't know if you have ever lost the front brakes on a dual system or not but I can assure you that in a standard dual system there is very little braking in the rear and the pedal will be on the floor. You could also engineer in a safety switch which will shut off the broken side of the system so all pressure goes to the good side but that is only the pressure from that side of the master so you still have little in the rear. Dual brake systems are not quite as simple as they sound. And as far as what you can get away with in Cali as far as MV is concerned is fine but have an accident and see if any of that will wash with an accident lawyer for the people that got injured. NOT!
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone


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