The Stovebolt Site Forums The Parking Lot Big Bolts Driveline parking brake ???

I am trying to find some sort of parking brake that I can attach to the rear of my Roadranger RTO-6613 transmission. Never available with a transmission mounted parking brake, as far as I have been able to tell.
I would like to find some sort of mechanical disc caliper, or a spring set air released caliper.
I need something bigger and stronger than an ordinary hydraulic caliper with provisions for a manual parking brake.
Can you think of some sort of equipment, or vehicle that may have something like this that I could addapt?
I don't have any problems putting stuff together and making things work, I just have not seen the pieces I need so I can put them together yet.

http://www.tsmmfg.com

I have heard from the mud bog guys that this same caliper and rotor setup is available from your local Tractor Supply Company.

Thanks, that's a start, and will work if I don't find something heavier. I suppose I could use two calipers on the same disk.
Any other ideas?

Wheel chocks?

Grigg,

Sort of the same idea...I know a Cat V-80 forklift uses a disc and mechanically actuated caliper, but probably not large enough for your taste.

I would maybe focus on this type of market..industrial lift trucks. There is a company called Horton that makes brakes, but I am not sure they have a mechanical one.

I have seen the photos of your shop and have seen your skill level...you could make the disc quite easily. The caliper in the V-80 Cat resembles a automotive caliper. Two stationary friction "pucks" on one side, and two that are actuated by a cam action on the other side. Pulling the parking brake rotates the cam that squeezes the frictions and centers the caliper.

Don't forget that when you come backwards through the ring and pinion ratio, you gain quite an advantage to hold your heavy truck with less brake.


Stuart

Check with International ( Navistar.) Our 4700's with juice brakes have a driveline brake. Usually, right after the trans. The actuator handle is universal and adjustable, in fact, you'll find those types of handles on most forklifts or electric carts. Hyster uses them alot.

I am liking the sound of a mechanical disc caliper from a fork lift or a front end loader.
Anyone have one handy, or know where to find one used? or cheap?
Grigg

would you want to use a hydrolock on the brakes? They work well........

fatweed, You mean Micolock?

Wouldn't you want a "true" mechanical connection for the parking brake. The Mico Lock I use at work merely blocks a hydraulic brake line that has been energized by pressing the brake pedal........but, I just went to the Mico Lock site and they have mechanically applied floating disc brake calipers..KOOL!

http://www.mico.com/literature/cbrakes.php3

Steve,

I knew you had it in you..bravo. A six pack of Brown Derby is headed your way, compliments of Joker.

Stuart

the older superduty fords, what we now call a F450 had a driveline brake with a drum and a set of shoes.this will be 88-98 or so. activated by a cable.

WOW Brown Derby Ale

yeah i meant mico lock...fergimme....im gettin old... LOL...

OK yer fergiven,
NOW ,Wanna Share summa Stu,s Brown Derby?
Ale that is

steve,

If your trying to get a rise out of me (appendage?) you'll not succeed my man! :p


Stu-Derby

Thanks for all the info!
I know the Mico lock is not good for a parking brake, that's why I want something on my transmission with spring, or mechanical apply.
The wheel chocks would work, but to be "legal" I have to have a real parking brake in my state. Also, I don't know of any automatic wheel chocks, the only models I am aware of require getting out of the cab.....

I think the Mico mechanicaly applied caliper is the closest thing yet, but not sure if it is strong enough, but could be. I don't want to deal with hydraulic release, although some of those calipers look nice.

Any other ideas out there?
Grigg

Besides the Navistar setup, I believe the Chevy / GMC P-vans came with a driveline brake at the end of the trans. The 4 wheel disc versions. I know P-vans are included in the 1 ton section when looking for parts, but they can be a bit bigger than that what with the I beam front axle and all.

The Navistar 4700, which is probably equivalent to a 3 or 4 ton truck, should use the Mico mechanical caliper. Not much force is needed to lockup that driveline. These trucks are powered by a DT466 with an automatic Allison World trans. If you'd like, I could crawl under one and get some part numbers or some pictures. We have a fleet of them where I work.

I don't think they ever put a parking on a tranny that big. Maybe somthing can be fabricated in the center on the drive shaft. Using the 13 speed is a cool idea, but it seems with a tranny like that with such a light truck it would be hard to shift. I think you would have to skip gears when your up shifting because you could not shift fast enough. I think a five or six speed would work better for you.

MNSmith, If you could please look and see about a 4700 it would help and if you could even send a picture of it that would be great!
If they do use the mechanical MICO caliper could you confirm it?
Could you also get a part number if it is on it, it soulds like they only make one, but just to be sure...
And if all else fails, I should be able to dig one up if I have the vin number of a truck equiped with one of these mechanical disc parking brakes.
Grigg

By the way, I am using the front and rear axles from a P-van.

Big T,
I think you are right about there not being a brake on a transmission this size, that's why I am thying to fabricate something for it. I can't use a center driveshaft one because I will only have a one piece driveshaft (no carrier bearing) with my short wheel base, and therefore it will be moving as the suspension travels.

The RTO6613 13 speed weighs 550 pounds, it's the smallest of the roadrangers.
My truck will be a 2 ton, so still light for a roadranger, but should handle it just fine.
I don't plan to use all the gears unless I am loaded and need them, otherwise I'll skip some and 4 or 5 will probably be enough. I don't expect it to be hard to shift.

On another note, I have decided to run some taller tires than I was originally planing on. So now I don't need an overdrive transmission to cruse at 70mph. I'll use one of the RT610 10 speeds that I already have, they weigh about 350 pounds. I'll still need a parking brake.
Take a look on my picture link below to see them.
Grigg

Grigg,

Do the roadranger transmissions have some air actuated shifting mechanism on them..will your truck need a air compressor?

Stuart

yes, I will need a little bit of air to shift from high to low range and back again. I will use an electric compressor and a tank

Solved! Well, at least on paper.

I have decided to use a new MICO mechanical caliper. A 13 or 14" by 1/2" thick steel disk welded to my output yoke. And a Bendix spring brake chamber specifficaly made for parking brakes, their number SB-1.

I have yet to find the chamber, or make the disk, but the caliper will be here in a day or 3.

Thank you all again for your help.
Grigg

Maybe you could use a front brake rotor off like a 3/4 or one ton but they might be to thick for what you need. A rotor off a full size car might work if the center is big enough.

I have been to the autoparts store today and looked in the catalog by dimensions. I could use a ford disc from a 1999 or so 150, but I think it will be easier to make my own.
Thanks,
Grigg

Good idea to pass on the Micro lock. They work fine for short stops,but they bleed down. At the paving co. where I worked as a kid,they had 2 old stovebolt dump trucks with those Micro locks on 'em. About once or twice a month a driver'd forget they bleed down and leave his truck parked with it set;next morning the boss'd have to either retrieve it from a gravel pile in the pit or drag it out of the river.(the two places in the yard a truck would coast to if released during the night. It wasn't all bad though-every time a driver made that mistake,he had to buy the end-of-shift beer for the whole crew each night for a week.
Speed