Towman2277

I was contemplating running a set of pinion brakes on my 5-ton, and was curious if anyone was using them on theirs? And if so, what master cylinder system were they running, with or without vacuum??

TheBuggyman

Towman,
We run pinion brakes on our Deuce rock crawler axles with great sucess but we found out three things:

1) We experienced alot of vibration unless one axle was fully locked. (spooled or welded)
We weld the rears and use a Detroit in the front.

2) Pinion brakes are more of an on/off control instead of a modulating control unless you
use low friction circle track pads.

3) Pinion brakes generate an enormous amount of heat even when they are not being
used, remember, the pinion is spinning roughly 6.5 times as fast as the wheel.

Conclusion: I can lock up four 44" Swampers on dry pavement with a manual brake set up and two pinion brakes! P-brakes kick major hind-end off road but i do not think that they would be a good choice for a street driven vehicle. Just an opinion from someone who has them. Hope this helps.

BTW, USA6X6 has very nice P-brake set ups for the Deuce with Wilwood Calipers and low friction pads at a good price. Rotors too. They may be able to get you squared away on a set for the Fiver.

1977 USMC M813-A1
M796A1 Trailer
MKT-95 Field kitchen

All that I am 'cuz of Uncle Sam!

Towman2277

Thanks for the input. I will be running duece axles under my 1-ton and using 47's for mud play, and plan on using pinion brakes, but after your advice, I will keep the 5-ton brakes stock!! Thanks!

TheBuggyman

Are you using the 47" LTB? That looks like an awesome tire, when my 44's wear out I think that I may switch. Do you know of anyone who wants a set of 44" TSL's on USA 6X6 double internal beadlocks for Deuce axles?

1977 USMC M813-A1
M796A1 Trailer
MKT-95 Field kitchen

All that I am 'cuz of Uncle Sam!

Towman2277

I plan on using the 47" LTB's. They are perfect for what i'm planning for. How much you selling your rim/tire combo for? I know many "mud-heads" running duece axles.

TheBuggyman

Tires are in real good shape leading edge is rounded, lugs almost full height. Tires have not been reversed so the other edge is pretty sharp. I also have a few extra o-rings for the wheels. $1600 firm for all four still mounted. If you sell them for more consider it a commission!

1977 USMC M813-A1
M796A1 Trailer
MKT-95 Field kitchen

All that I am 'cuz of Uncle Sam!

jwaller

I wonder how hard it would be to keep the stock deuce brakes and add pinion brakes at the same time. this way you improve the crappy stock brakes and more less wear and tear on the pinion setup. wonder if you could get them to all work together and not fight each other.

M998 W/W
XM818 W/W
M35A2 W/W
M932A2 W/W
M270A1 (2)

Waller performance owner/builder
http://www.wallerperformance.com

TheBuggyman

Might work together but you will still generate all that heat as the pad drags on the rotor.
Probably generate enough to boil the fluid/warp the rotor/ruin the caliper on an extended drive.

1977 USMC M813-A1
M796A1 Trailer
MKT-95 Field kitchen

All that I am 'cuz of Uncle Sam!

cranetruck

I once estimated the power dissipation capacity for each of the service brake drums to be about 12,000 watts. If you try to dublicate that with a single disc, it will get very hot.

Bjorn
Virginia's Blue Ridge Mountains

(Link to PS magazines: http://old.steelsoldiers.com/index.php?name=gallery)

Avatar: XM757 in OK prepared for 1,000 mile trip home. Part of 6,000 mile journey in 2006.
1968 M49A2C modified with 1960 M756A2 truck bed and 1975 HIAB 765A knuckleboom. Heated dual tank system for biodiesel/veggie oil use.
1969 Ford XM757 8x8, 5-ton Pershing 1A truck tractor, the "improved" MV.
"Some things can't be made better, just differently......a lot of things actually"

TheBuggyman

Yeah, what he said!

1977 USMC M813-A1
M796A1 Trailer
MKT-95 Field kitchen

All that I am 'cuz of Uncle Sam!