Gotta get bigger!
just another Rockwell looser
Joined: Feb 2003
Posts: 4,042
Likes: 0
From: Cocoa, FL
i had a magic 8.8 axle shaft that wouldn't break.....i broke everything in my old 8.8 except that one axleshaft, the splines were twisted to hell but it would never break while i broke multiple axleshafts on the other side....wierd
my uncle runs his truck all around with the stock drums.
but if you do run disks eventually, save some $$$ and build them yourself.
my uncle runs his truck all around with the stock drums.
but if you do run disks eventually, save some $$$ and build them yourself.
Post Fiend
Joined: Oct 2003
Posts: 6,949
Likes: 1
From: utica il
dave, i know they don't have to be large to accomplish good braking, they get a little "assist" from the gear reduction, or however you would say it. what i was getting at is that it is still a **** ton of force and heat to put on such a small area. i would imagine after a few hard brakeing's(sp?) that you would have some warpage.
granted monster trucks are about 10,000 lbs, but this guy said his truck weighs 8k. you ever see a monster truck hit the skids? sparks flying like a torch trying to stop that heavy weight with just two pinion brakes.
EDIT: this just occurred to me as well: in 2x4 you only have rear brakes with that setup, correct????
granted monster trucks are about 10,000 lbs, but this guy said his truck weighs 8k. you ever see a monster truck hit the skids? sparks flying like a torch trying to stop that heavy weight with just two pinion brakes.
EDIT: this just occurred to me as well: in 2x4 you only have rear brakes with that setup, correct????
Junior User
Joined: Apr 2010
Posts: 56
Likes: 0
From: Los Alamos, New Mexico
Check your local laws regarding the pinion brakes. Here in New Mexico the law reads something to the effect that you have to have two wheels stopping per end. If you run locking diffs in the axles and run just a pinion brake this makes them legal here. Also, running a single rotor per axle will give the wheels a mechanical advantage over the brake system surface area. But, with the brakes located on the pinion there is a lot of air flow over the rotor helping cool the system down quickly. My brother in law installed some cross drilled rotors to further the cooling of the system. It makes a funny noise when the brakes are applied but, works well.
LT.
LT.
Thread Starter
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Senior User
Joined: Mar 2005
Posts: 177
Likes: 0
I would think that the biggest issue with pinion brakes on the street would be a broken axle shaft. Without a welded axle you'd be SOL. I assume that it is an effective braking system on its own, but 6 brakes compared to 2 or 4 sounds like a sweet deal. Seems like it would take some dialing in to get them to all work together, but I bet it would sure stop well.
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just another Rockwell looser
Joined: Feb 2003
Posts: 4,042
Likes: 0
From: Cocoa, FL
i wouldn't recomend pinion brakes on the street......
ive been in several, they are extremely sensitive.....barely touch the pedal and your face is through the windshield.
just one brake easily stops very large trucks....
ive been in several, they are extremely sensitive.....barely touch the pedal and your face is through the windshield.
just one brake easily stops very large trucks....
Thread Starter
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Senior User
Joined: Mar 2005
Posts: 177
Likes: 0
Well, like I said, proportioning valve would be necessary to balance the power out, but I'd rather have the ability to put my face through my windshield then not be able to keep my truck from going through someone else's.
I've already decided that if it's possible to work it right, then I'm gonna do it. My only concern is whether or not a proportioning valve has the ability to adjust to that much of a difference, because with the mech advantage of the pinion brakes, I'm sure the amount of pressure going to them would have to be greatly different from the pressure to the wheel brakes in order to balance it out.
Would there be any other issues?
I've already decided that if it's possible to work it right, then I'm gonna do it. My only concern is whether or not a proportioning valve has the ability to adjust to that much of a difference, because with the mech advantage of the pinion brakes, I'm sure the amount of pressure going to them would have to be greatly different from the pressure to the wheel brakes in order to balance it out.
Would there be any other issues?
Elder User
Joined: Oct 2009
Posts: 933
Likes: 0
From: Lawrenceville, Ga
What retard daily drives a truck on rockwells anyways...? It'd be fine to run pinions on the street some in terms of warpage, overheating and whatnot. Plus, if you design them without going insane like some people, rotors are $20 a piece and pads are lifetime warranty.
Posting Guru
Joined: Apr 2006
Posts: 1,218
Likes: 0
From: Fl
If your running rocks on the street you should just suck it up and run 4 wheel disks.
Thread Starter
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Senior User
Joined: Mar 2005
Posts: 177
Likes: 0
Maybe I will 
Actually, not planning on daily driving, but I do plan on driving on the street occasionally. I fully intend on going to 4 wheel discs. Obviously 4 wheel discs with pinion brakes isn't a popular possibility on this forum. Which probably means I'll probably do it just to be the only one with it 
As long as everything else on the truck is gonna be excessive, my brakes might as well be too.
Actually, not planning on daily driving, but I do plan on driving on the street occasionally. I fully intend on going to 4 wheel discs. Obviously 4 wheel discs with pinion brakes isn't a popular possibility on this forum. Which probably means I'll probably do it just to be the only one with it As long as everything else on the truck is gonna be excessive, my brakes might as well be too.