R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 05-17-2008, 11:15 PM   #1
Tech Addict
 
jt415gz's Avatar
 
Join Date: Mar 2008
Location: The Bay
Posts: 656
Trader Rating: 29 (100%+)
Angry MRX-4X building brake pads/disc friction problem

Quick question for you guys...

I just built the rear bulkhead and need to know if the ventilated disc brake rubs on the teflon brake pads all the time on purpose as its design?

I swear the disc brake should rotate freely without any friction before applying any braking power purposely.

Did I do something wrong? Haha I did CA the pads to the metal plates.

The lower half of disc and brake pads have freeplay but the upper half portion are touching each part causing friction and not allowing 2speed axle to rotate freely enough, pretty notchy.

Anyone notice this happening too during build?
If so, is it supposed to be this way...how did you fix the problem?

-Jeff
__________________
Thanks,
-jT =]
jt415gz is offline   Reply With Quote
Old 05-17-2008, 11:52 PM   #2
Tech Champion
 
Roelof's Avatar
 
Join Date: Aug 2007
Location: Holland
Posts: 6,287
Send a message via ICQ to Roelof
Default

The glue could made the pads thicker, just rub them on a piece of sandpaper to make them flat and a tiny bit thinner.
__________________
The quality of an answer comes with the quality of the question.
Roelof is offline   Reply With Quote
Old 05-18-2008, 12:36 AM   #3
Tech Addict
 
jt415gz's Avatar
 
Join Date: Mar 2008
Location: The Bay
Posts: 656
Trader Rating: 29 (100%+)
Default

just shaved off the pads a lil on both sides in hopes of getting the pads symetrical and it helped a little, so I am just going to break in these pads when I practice on track. Hopefully it will be free afterwards.

Thanks for your help buddy!
__________________
Thanks,
-jT =]
jt415gz is offline   Reply With Quote
Old 05-18-2008, 06:03 AM   #4
Tech Elite
 
evostyle's Avatar
 
Join Date: Oct 2003
Location: St. Louis
Posts: 3,700
Trader Rating: 102 (98%+)
Default

I would check and make sure the disc is not binding on the three pins. It's designed to float on the pins a small amount. If so your disc will not rotate true. I just replaced my pad and also noticed the yellow teflon pads are just a tad taller than what I remember. The excess material at the top of the brake disc could also be binding up against the top plate. Since you said you glued them the other item that may be causing your problem is the HOLES may not be perfectly aligned on the plate / pad causing your pads to stick / drag on the mounting screws. Other than that you should have a smooth true running disc brake. Hope this helps...
__________________
"If you no longer go for the gap that exist, you are no longer racing". Ayrton Senna
evostyle is offline   Reply With Quote
Old 05-18-2008, 12:04 PM   #5
Tech Addict
 
jt415gz's Avatar
 
Join Date: Mar 2008
Location: The Bay
Posts: 656
Trader Rating: 29 (100%+)
Default

Quote:
Originally Posted by evostyle View Post
I would check and make sure the disc is not binding on the three pins. It's designed to float on the pins a small amount. If so your disc will not rotate true. I just replaced my pad and also noticed the yellow teflon pads are just a tad taller than what I remember. The excess material at the top of the brake disc could also be binding up against the top plate. Since you said you glued them the other item that may be causing your problem is the HOLES may not be perfectly aligned on the plate / pad causing your pads to stick / drag on the mounting screws. Other than that you should have a smooth true running disc brake. Hope this helps...
Will definitely check out all of those areas and come back and talk about what I've found. If it matters at all, I am using T0154 eccentrics for the rear set at upper 90 degrees slot.

Found another binding issue: Front drive belt that rotates over middle/center pulley to front one-way pulley...problem is that the belt tightens through 25% out of its complete/full revolution...the other 75% is free and loose...I am using the H0188 as opposed to the T0154 eccentric hubs in front set at LOWER CENTER SLOT (90 degree)

__________________
Thanks,
-jT =]
jt415gz is offline   Reply With Quote
Old 05-18-2008, 04:53 PM   #6
Tech Addict
 
jt415gz's Avatar
 
Join Date: Mar 2008
Location: The Bay
Posts: 656
Trader Rating: 29 (100%+)
Smile

I just really needed to shave those brake pads down about .25mm on both sides and doing that really helped smooth things out freely.

Now as far as the front drive belt...decided to change to the T0154 eccentrics upfront in lower/middle slot and took apart front one-way completely and inspected the 24T pulley for any abnormalities (I didn't find anything misleading)
I then proceeded the rebuild process carefully and surprisingly the front drive belt now only has about 5%-10% untrue circular rotation characteristics.

I guess nothing is perfect in each factory kit.
__________________
Thanks,
-jT =]
jt415gz is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Gluing Brake Pads newbie2006 Nitro Off-Road 4 06-19-2007 03:19 AM
teflon brake pads wario69 Nitro On-Road 9 04-23-2007 08:04 AM
Wanted Kfactory optional brake disc and pads for V1RRR jeff1 R/C Items: Wanted to Buy 2 08-05-2006 10:37 AM
brake pads Modifiedrs4evo3 Nitro On-Road 7 01-31-2006 06:44 AM
NTC3 brake pads froghead R/C Items: Wanted to Buy 0 04-14-2004 11:58 AM



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 02:34 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net