R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro Off-Road

Reply
 
Thread Tools Search this Thread
Old 08-23-2010, 07:34 AM   #1
Tech Addict
 
Join Date: Mar 2010
Posts: 614
Trader Rating: 8 (100%+)
Default Why do I have no brakes?

Losi 8ight t 2.0. It has the newer design rotors. My linkage was setup perfect per losi addendum instructions. I run spektrum dx3s and the epa on the brake end is about 40%. I get some brake but not much. I'm running 9100T at throttle so torque isn't an issue. I'm alittle gun shy of upping the epa since losi's eat throttle servos. What is everyone else's epa on brake if running a spektrum(so they might somewhat compare to mine). I get my servo horn on straight as well.

I see some guy's run so much brake they could lock it up at WOT. Not quite looking for that but i do tend to drive using some push brake. Thanks.
__________________
Losi 8ight T 2.0 - Mugen Ninja
Mugen Eco - Tekin 1900KV RX8
Byrons 30%
Spektrum
Proline/J Concepts/AKA
bacchus is offline   Reply With Quote
Old 08-23-2010, 09:01 AM   #2
Tech Adept
 
Join Date: May 2010
Posts: 126
Default

Have you tried adjusting the brake knobs?

Your brake rod could be pushing the pads only a little.

I've known WD40 to cause some brake problems but goes away quite fast.

My epa is 50 or less I don't quite remember I don't use a whole lot of brake
__________________
Team Losi 8ight 2.0
Team Losi Nitrotec w/ 2013
riverviewrc is offline   Reply With Quote
Old 08-23-2010, 09:22 AM   #3
Tech Adept
 
josefmd's Avatar
 
Join Date: Jul 2010
Location: Lebanon, OH
Posts: 119
Trader Rating: 7 (100%+)
Default

I am running 50 on my brake EP, and 40 on my throttle! If I increase my throttle EP up to 70 like the Losi DX3S radio setup PDF has, I have way too much throw. I get major rubbing on my body when I go full throttle.
Like the above poster said, try adjusting both front and rear knobs a couple turns at a time. I have spent some time trying to get my brakes fine tuned.

DX3S-LOSB0084.pdf
__________________
Team Associated SC10 brushless
Team Associated RC10 B4.1
Team Associated RC8B
GO GX5R
Spektrum
josefmd is offline   Reply With Quote
Old 08-23-2010, 09:27 AM   #4
Tech Fanatic
 
jwm2's Avatar
 
Join Date: May 2010
Location: Grand Rapids, MI
Posts: 823
Trader Rating: 5 (100%+)
Default

To me the EPA seems abit low. I usually adjust it to stop right before it starts to move the radio tray when applied. It may shift the radio tray a mm or so, but it shouldn't move it too much. Any less than that and you aren't getting engough throw to apply the brakes. The brakes work on friction and without enough throw it won't build enough friction to stop your rc. You can also try adjusting the knobs but don't over do it. I'd start with the EPA, bump it up to 45 or 50% and see how it goes. You can roll the car on the ground and lock up the brakes to get a feel for its stopping power. Then adjust accordingly.
jwm2 is offline   Reply With Quote
Old 08-23-2010, 10:09 AM   #5
Tech Elite
 
Join Date: Mar 2009
Location: Aurora, Colorado
Posts: 3,644
Default

My EPA is set just so the radio tray dont flex much........ Then I use brake control to adjust.........

my radio is set at 89% on brakes. I just all the torque my servo can dish out..
__________________
TLR - Spektrum - Horizon - TLR 8ight 4.0 - TLR 8ight-T 4.0 - TLR 22 4.0 - Orion
token is offline   Reply With Quote
Old 08-23-2010, 10:13 AM   #6
Tech Adept
 
Join Date: Nov 2009
Location: southern ca
Posts: 164
Trader Rating: 5 (100%+)
Default

your break pads could have gotten oil on them or could have glazed over. the epa sounds good because that is all i ran in my losi when i had it, but you should also play with the knobs a bit to completely dial it all in.
__________________
"when a man live's dangerous he's not afraid to die, ...... when a man's not afraid to die he live's stangely happy."
bigred0988 is offline   Reply With Quote
Old 08-23-2010, 11:46 AM   #7
Tech Addict
 
Join Date: Mar 2010
Posts: 614
Trader Rating: 8 (100%+)
Default

Yeah at low speeds they feel ok but at higher speeds they don't work as well. Maybe i need to run alittle more epa. The stock settings were like 65% or something crazy. i just don't wanna burn up a servo!
__________________
Losi 8ight T 2.0 - Mugen Ninja
Mugen Eco - Tekin 1900KV RX8
Byrons 30%
Spektrum
Proline/J Concepts/AKA
bacchus is offline   Reply With Quote
Old 08-23-2010, 11:47 AM   #8
Tech Addict
 
Join Date: Mar 2010
Posts: 614
Trader Rating: 8 (100%+)
Default

Quote:
Originally Posted by bigred0988 View Post
your break pads could have gotten oil on them or could have glazed over. the epa sounds good because that is all i ran in my losi when i had it, but you should also play with the knobs a bit to completely dial it all in.
Any good way to clean them? Like the metal shoes and the rotors?
__________________
Losi 8ight T 2.0 - Mugen Ninja
Mugen Eco - Tekin 1900KV RX8
Byrons 30%
Spektrum
Proline/J Concepts/AKA
bacchus is offline   Reply With Quote
Old 08-23-2010, 12:35 PM   #9
Tech Prophet
 
tc5 man's Avatar
 
Join Date: Oct 2007
Location: levittown pa
Posts: 16,872
Default

Quote:
Originally Posted by bacchus View Post
Yeah at low speeds they feel ok but at higher speeds they don't work as well. Maybe i need to run alittle more epa. The stock settings were like 65% or something crazy. i just don't wanna burn up a servo!

adjust the brake collars, and follow what the manuel says and dont go farther than that or you will get brake drag. i had the same exact problem even though i had my, brake epa to 45 % and had clearance on the brake pads also clean the brake pads off, with motor spray and scuff them with sandpaper.
tc5 man is offline   Reply With Quote
Old 08-23-2010, 12:41 PM   #10
Tech Fanatic
 
jwm2's Avatar
 
Join Date: May 2010
Location: Grand Rapids, MI
Posts: 823
Trader Rating: 5 (100%+)
Default

65% isn't crazy, hell even 100% isn't crazy, thats what the radio and servo are suppose to operate at. 100% just means full throw. We turn them down to save wear and tear on the servos and to make them last longer, but alot of people don't use EPA or even know what it is.

If it feels good at 65% then run it at that. On brakes you will always have some servo noise when they are being used because they operate on friction, they are fighting the servo in order to create the friction to stop your vehicle.

Like i said above adjust it to you radio tray only moves slightly if possible, the less movement the better but also be sure your brakes operate correctly. A new radio tray is alot cheaper than broken parts if you don't get your vehicle stopped in time to avoid danger.
jwm2 is offline   Reply With Quote
Old 08-23-2010, 12:43 PM   #11
Tech Fanatic
 
jwm2's Avatar
 
Join Date: May 2010
Location: Grand Rapids, MI
Posts: 823
Trader Rating: 5 (100%+)
Default

Quote:
Originally Posted by bacchus View Post
Any good way to clean them? Like the metal shoes and the rotors?
Brake cleaner is cheap and handy to have on hand. I use it if i get oil on the brake pads on accident. The oil i've used in the past has a habit of shooting out rapidly even if you only lightly press the trigger. Just squirt some brake cleaner on them and let it dry, then try the brakes again on the ground or run a tank of fuel through it using the brakes as often as you can. They'll lock up alittle better each time you apply them.
jwm2 is offline   Reply With Quote
Old 08-25-2010, 12:20 PM   #12
Tech Addict
 
Join Date: Mar 2010
Posts: 614
Trader Rating: 8 (100%+)
Default

So just clean the brakes with automotive brake parts cleaner? I can wipe down the pads and the black circular discs with it? Just want to make sure it won't ruin the material the discs are made out of. I have the newer thick ones.
__________________
Losi 8ight T 2.0 - Mugen Ninja
Mugen Eco - Tekin 1900KV RX8
Byrons 30%
Spektrum
Proline/J Concepts/AKA
bacchus is offline   Reply With Quote
Old 08-25-2010, 12:41 PM   #13
Tech Fanatic
 
jwm2's Avatar
 
Join Date: May 2010
Location: Grand Rapids, MI
Posts: 823
Trader Rating: 5 (100%+)
Default

If you are worried you can just use some rubbing alcohol. That may at least save you a trip to the store to buy brake cleaner.
jwm2 is offline   Reply With Quote
Old 08-25-2010, 12:42 PM   #14
Tech Addict
 
Join Date: Apr 2008
Posts: 544
Default

Quote:
Originally Posted by bacchus View Post
Any good way to clean them? Like the metal shoes and the rotors?
This might sound silly, but I clean my brake rotors on my garage floor. Its a smooth finish floor, so I scuff the rotors on it then spray them off with brake cleaner.
__________________
Shaun Davis
VP ProUSA
Mugen Seiki/Alpha Engines
Team Trinity
Miniracer23 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
New to electric, what do i need ? Pattojnr Electric On-Road 11 12-30-2009 11:37 AM
Throtle Servo Fried, Thoughts On Why????? dishsoap Nitro Off-Road 10 03-22-2009 12:32 AM
Guys i need help from experince drivers... didrace Nitro On-Road 43 10-10-2008 10:11 AM
Why do people disconnect there power caps in 4-cell 1/12th onroad noline Electric On-Road 9 12-14-2005 05:50 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 11:27 AM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net