No breaking power!

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waqr

waqr

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Hi!

I was out bashing yeasterday with my FG MT and suddenly I realised that I had no braking power. The brake looks intact and it seems that all parts are still there. When I brake the metalplate hits the disc as it should. Any suggestions?
 
WHAT SERVO ARE YOU RUNNING? my 5g servo lost power after a while. i don't have an fg mt, but i know theres and adjusting collor at the end of the linkage. you might have to pull it in a little. is there a spring there or is it fuel line. ive taken the springs out of mine and installed fuel line for more braking torche.
 
cyclops1970 said:
your grub screw that holds the layshaft square came loose and when you retighen it make sure its on the flat part of the layshaft and use blue thread lock
Click to expand...

Can you explain more please. Didn`t understand everything (not so good in english) Maybe you have pictures that can show me what screw you mean?
 
kryptonite5b said:
WHAT SERVO ARE YOU RUNNING? my 5g servo lost power after a while. i don't have an fg mt, but i know theres and adjusting collor at the end of the linkage. you might have to pull it in a little. is there a spring there or is it fuel line. ive taken the springs out of mine and installed fuel line for more braking torche.
Click to expand...

The servo is ok and I have tried to adjust the linkage. I have fuelline, not a spring.
 
theres a set screw on the alloy brake square where the disk runs on , either your brake disk lost the square and is now round or your screw came loose , look to see the set screw on the square that your brake disk is on and tighen up that one ..
 
cyclops1970 said:
theres a set screw on the alloy brake square where the disk runs on , either your brake disk lost the square and is now round or your screw came loose , look to see the set screw on the square that your brake disk is on and tighen up that one ..
Click to expand...


Ahhh....now I understand :) But how does the brake work? This alloy brake square spins when I move the wheels and when I hit the brakes it should come to a halt inside the brake disc, Is this correct understood by me?
 
waqr said:
Ahhh....now I understand :) But how does the brake work? This alloy brake square spins when I move the wheels and when I hit the brakes it should come to a halt inside the brake disc, Is this correct understood by me?
Click to expand...

correct when you apply the brakes the caliper squeezes the brake disk which stops the shaft from turning to the differental i hope you understand or can kinda figure it out because im poop at expliaining stuff !
Good Luck
 
Damn....I still can`t find the problem with my brake :( It was not the alloy square that were loose and I can`t see anything else that looks wrong either.

But I still can`t figure out what happens when the metalplate squeezes the brakedisc. What stops the shaft from spinning? I would understand if the brakedisc were spinning but on the FG it is not moving at all as I have understood. In that case why have a metalplate that squeezes the disc?

Can someone also please tell me how the easiest way to dissasemble the car so I can dismount the brakes?
 
ok, so what your saying is that the fiberglass discs are not spinning when you turn the wheels or you can hold the discs with you fingure and they wont move while spinning both wheels? if you look in there you will see that the discs have a square whole. the only way that the discs wouldnt spin is if they were rounded off, wich is very hard to do. have tried adjusting the coller that is closest to the fuel line? it just has a small set screw in there. also have you tried to pull the brakes by hand and trying to push the truck? does it feel like it wants to stop? is the disc riding on the metal square block that is on the layshaft? or has the block moved out of reach for the disc? i do not have the same truck as you, but the brake set-up is very close as it is an fg. try those thing first. if the disc is "free spinning" on the square hub, then the disc need to be replased. as i stated, the discs are supposed to have a square hole that fits over the square block. i will try to help you take it apart the best i can, but its tuff when you have to type everything, ya know.
not sure if the pic will help, but this is what its supposed to look like,note that the disc has square hole over square hub..
helpwaqr003.webp
 
so you can imagine its hard to explain. but a good tip would be to put all the screws back in were they came out as you disasemble.. first you need to take the layshaft gear out, wich is the smallest gear, closest to the diff case on the same shaft that the brakes are on. next i would take off the square hub that is on the layshaft. that square hub is "supposed" to grab the fiberglass brake discs. now go over to the spur gear wich is the large plastic gear closer to the motor. it comes off with an e-clip. once thats off, the layshaft 'MAY' slide out. the discs should fall out with the layshaft and the brake pads will just be hanging around. thats it. its out. im suspecting that the discs are rounded by what you have said. never seen it before, but yu never know. if you have trouble just post a question up on were to find the on-line manual link. it will give you an "exploded" veiw of the hole truck. let me know what happens and good luck.
to help you out next time, you should work on taking your truck apart and clean everything and put it back together(even if its not dirty). just do a portion at a time, like start with your suspension and then go to the shocks and eventually youll be pulling the motor out just to look at it..lol. its part of the fun and it will give you a great understanding as to how it all works. its easy as long as you stay orginized..jason
 
Thanks very much for taking time to write such a good explantion. I really appreciate it :)

What I say is that the brake disc is never spinning, it is stuck (and maybe it should be like this?). The only thing spinning is the alloy square when I spinn the wheels. And this square still spinns when I apply the brakes. I have tried to tighten the screw that holds the alloy square without any result. However, I haven`t tride to unsrew it och push it further inside the disc (maybe it is like you say that it is out of reach for the disc).

The car is almost brand new (about 8 litres) so I would be surprised if the disc would be worn out.
 
If your brake disk it not spinning, the square(in the middle) must be worn out and needs to be replaced.

With the engine off, can you spin the brake disk around the shaft? If so, it is one of two things:
1) does your layshaft(shaft that holds the spur gear) slide in and out? if so more than a few milimeters? If so, the square that the brake disk goes around may be mounted in the wrong plact.

2) The sqare in the disk is stripped or rounded out and you need a new brake disk.
 
Hmmm...ok but I can`t move the disc at all. It is stuck. Should it be like this or should I be able to spin the disc with my fingers?

When I move the car forward the layshaft and the alloy square (that is mounted on the shaft) is the only thing that moves.
 
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DUDE!! YOU don't NEED TO TAKE THE ENGINE OUT...waqr. im completly understanding what you are saying. the brake pad or caliper is stuck to the disc. IT IS NOT SUPPOSED TO BE LIKE THAT!!:no:.. THIS COULD HAVE BEEN COUSE BY A FEW THINGS, one of them being the adjusting coller on the rod that has the fuel line could have been over adjusted(from factory) you may not have noticed it being that it is fairly new and its your first large scale(?). if you ran it like that, it could have easly melted the fiber glass disc turning. its just a thought. regardless.. answer this question... is the fiber glass disc that is on the large square hub ROUNDED OR SQUARE in the CENTER????? think of it as the brake rotor on your real car. the rotor spins on the axel and the caliper squeezes the rotor to slow it down. in effect, your layshaft would be your axel.. it sounds like you have to replace the disc. take it apart as i stated and see what the problem is. the parts are REALLY CHEAP. HERE IS A LINK SO YOU CAN SEE WHAT THE DISC IS SUPPOSED TO LOOK LIKE. the other link is for the brake hub wich im sure you wont need.

this link is for fgsupply, also commonly refered to as vsmodelsport. this is the only place i buy my fg parts from. they are the best!!
http://www.fgsupply.com/FG_Monster_Stadium-Brake_disk_epoxy_97_new_1_pcs.html

http://www.fgsupply.com/FG_Monster_Stadium-Brake_square_97_new_1_pcs.html
 
I have already ordered a new disc and brake hub :) (just in case). I can?t see wether the disc i rounded of or not in the center without taking the disc off the car.

I have just one question about getting the layshaft off. When I have taken away the gear protector, and the main gear (48 teeth), how do I get off the spur gear (the one that is closest to the diff). This is the gear that stopping the layshaft from coming off. It seems impossible to reach the gear without having to dismount the engine :( Because I think I need to take the layshaft off in order to get to the disc, right?
 
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i may be wrong, but im really thinking that you don't have to take the motor out to remove the brakes and stuff. the spur gear comes off with an e-clip. just take a flat head screw driver and carefully and slowly pry it off. it tends to fly accross the room. there is a small gear at the end of your lay shaft, that is connected to the large metal diff gear in the center. that small gear comes off with 2 small set screws. if you spin the gear you will see them. once the spur gear is off, the layshaft gear is off, and the square brake hub is off, the layshaft should slide out. are you saying that you cant reach the set screws in the layshaft gear? it is very simular to what i have and comes out very easy, once you know what screws to take out. can you take some pictures of it for me? that would help. your parts should be here soon, so we need to get it apart so you can get back out there!!!!:2guns:
 
No need to remove the engine but you do have to remove the gear carrier assembly. The clutchbell and pinion gear can stay on. Remove the 3 large allen head bolts going into the engine. Then remove the gear carrier which holds the 48T gear. If it's plastic, replace with a metal one. If it's aluminum undo the set screws. Once this is done you can remove the assembly. If you try to remove the pinion that connects to the diff gear it will be very difficult. FG likes to use red threadlock there.

It's good to remove all of it to see how it works so you can fix it next time. The disk works good but the steel brake disk upgrade works very well. I've had several FG's and once you know how to work on them it's easy.
 
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