Need Mech Brake Advice and pinion/ motor shaft help...
 

Need some quick advice regarding my pinion sitting on my motor shaft with the brake assembly on the new motor mount.

If you look at the pics below...

You can see that with the dual brakes fitted, i will need roughly a 15mm motor spacer to push my motor away from the mount in order to clear the brake assembly.

Dejan is making the custom size spacer for me...

But this means the pinion will have to sit half way off the motor shaft too.

Is this a very bad idea? considering im running 9s? Should i just go with a decent single brake setup in the front?

http://i878.photobucket.com/albums/a...3-08133018.jpg

http://i878.photobucket.com/albums/a...3-08135542.jpg

http://i878.photobucket.com/albums/a...3-08135618.jpg

http://i878.photobucket.com/albums/a...3-08135718.jpg


This does seem like a bad idea, and i should really run a single brake disc and pads instead.

If so... What are the toughest brake pads and discs out there that work with my spider diff axle and can handle high temps with no fade???

THANKS

Maybe a Tekno long shank pinion will solve your woes. It is still going to put similar stresses on the front bearing but should be a little easier on the shaft since it will move the set screw further down the shaft.

Anyway is that the rear brakes. If so I think you can loose a disk IMO. Majority of the braking is done by the front but that also depends on your driving style and setup of the buggy. I would try with only one rear disk and a Tekno long shank pinion. I think that should work. Anyway try before you buy. No need getting parts like the brake disks/pads if the standard ones will do the job.

If you are running a center diff (looks familiar BTW :wink:) isn't it better to have both front and rear brakes? You could run a single brake disk front and rear, seems like it would give the vehicle better braking than with 2 disks on one side.

I'd go with 2 discs in front and one in the rear,as previously said the front does most of the braking anyways.--josh

sorry guys, i didnt make it clear...

I wanted to run dual discs front and single disc on the rear :)

What you are looking at in the pics are my front brakes...
BUT

as the motor is in the way, and i need a spacer to pull the motor from the mount so the brake assembly has space.
So it looks like i can only have one brake disc on the front, unless i use the tekno long shank pinion (but i do not like the idea of only being able to use a single type of pinion) ....
i can still have two on the rear, but as we all know all the braking is basically done with the front... so only one will be necessary....

So as i can only really have a single disc on the front, im wondering what are the best discs and pads that will work for my applications???

OK I see now. Can't really help you much on the mech brake discs/pads as I've never used them. I know Ferodo makes brake materials for 1:1 cars that are supposed to be very good, and you can get RC brake discs and pads made out of their materials. The Slipperential uses Ferodo material for the slipper pads and it seems to be very long lasting and good friction.

If you can't find the ferodo material,some of the best pad and caliper combos is carbon fiber discs and aluminum pads. They bite into each other very well and the carbon fiber wears well too.

have any of you heard of cradlock brake pads???

thanks for the advice so far :)

as mentioned above in rc applications carbon fiber disks with aluminum pads are proving to be the best combination. It's important to note the carbon should be roughened with sandpaper first, a glossy resin finish doesn't bite

The main issue with using a long shank pinion is increasing the load on the motor bearing. The forces aren't exactly huge, but a heavy truck with 9s and a long shank pinion is going to see more than average forces at the bearing. Regular inspection and/or replacement of the front motor bearing would be recommended. Where the setscrew is on the motor shaft doesn't make any difference in the amount of force at the bearing. Its where the gears mesh that determines the leverage and amount force placed on the bearing. The fact the pinion is an odd size is another drawback though.

Thanks for your opinions and advice...
I have decided to go with single antilock cradlock brake pads and metal pads.
My 17kg power servo should be plenty of pressure for stopping my truck without locking the wheels up causing me to lose control... hopefully haha