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Post by katt on May 14, 2018 5:23:50 GMT -5
I have been riding for two weeks and front brake was okay it would not lock front wheel even if i push front brake leaver all way.
Changed the brake hose and brake fluid and now front brake acting really stupid wheel locks if i apply very little pressure (even using 2 fingers) and scooter starts skidding.
In other words front brake become TOO efficient to the point that it is not usable anymore. I cannot brake even from 20mph without some mad skidding and almost falling, got to impulse brake in order to avoid locking as any extra pressure locks front wheel instantly.
Its not matter of getting used to it, in dangerous situation i am used to slam the brake hard and this is recipe for losing balance and falling.
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Post by mrkswthwrth on May 14, 2018 5:33:47 GMT -5
Practice practice man. You finally learned what good brakes feel like. You shouldn't ever have to pull the lever to the bar to engage the brakes.
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Post by katt on May 14, 2018 6:09:16 GMT -5
Was in situation today someone drunk turning on red light did not see me so i had to PANIC-BRAK and of course fall down instantly.
I like it pushing brake all way, i rather have longer stopping distance on front brake than no stability, i am selling it unless i can turn it back to way it was.
dont need this brakes thanks.
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Post by benji on May 14, 2018 8:34:31 GMT -5
You probably are just not used to it. You need to ride it some more and get used to it, also get used to using the REAR brake, as it was installed for a reason. Hitting the rear brake in conjunction with the front brake (vs. front brake only) changes the dynamic of the vehicle as it slows down. It begins to equilize pressure on the wheels instead of rotating the mass of the bike on to the front wheel alone. Alot of guys don't even use the rear brake. We call them 'squids', short for squirrelly-kids, cuz there all over the place and can't control the bike but are still hitting the throttle and doing wheelies haha.
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Post by GrumpyUnk on May 14, 2018 11:12:17 GMT -5
Katt, you might want to drain the brake fluid, clean out the caliper cylinder and piston, clean the hose/tubing, and disassemble and clean the 'master' cylinder on the handle bars. Sometimes very tiny bits of 'stuff' can block passages, preventing proper operation, and retraction of the piston.
I had one that you could grab the lever as hard as you want, it felt as if it was working, but no brake action. There was a blockage in the master.
Take it apart and clean it, re-assemble with NEW fluid. See manual for type, I think DOT-3. Flush the master, hose and caliper and see if it improves.
tom
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Post by cagiva4ever on May 14, 2018 16:52:03 GMT -5
maybe "katt" should stop being a biker. and use bicycle. or why not fitt the "adjustable ABS unit" to the front brake, between caliber and hose banjo.
the ABS units have been around for a long time on some of these china scooters. some might be wrongly adjusted, and they always need to be dismantled checked, re-adjusted-tuned.
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Post by katt on May 14, 2018 17:43:03 GMT -5
maybe "katt" should stop being a biker. and use bicycle. or why not fitt the "adjustable ABS unit" to the front brake, between caliber and hose banjo. the ABS units have been around for a long time on some of these china scooters. some might be wrongly adjusted, and they always need to be dismantled checked, re-adjusted-tuned. Perhaps i should stop because before i enjoyed riding it and now i am afraid to use front brakes, and no i will never get used to this because in panic situation i will not brake carefully.
By ABS you mean this thing i have saying ABS how do you adjust it?  |
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Post by benji on May 14, 2018 18:30:49 GMT -5
I'm not sure what that is but I bet that's your problem. My bike doesn't have that haha.
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Post by benji on May 14, 2018 18:33:09 GMT -5
maybe "katt" should stop being a biker. are we bikers? I thought we were,uh,scooter'er's. And if he starts riding a bicycle, wouldn't he continue to be a biker? Personally, I consider myself a Rider. A Team Rider, actually. A 2 stroke assassin. Not just a biker. |
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Post by jeff84 on May 14, 2018 20:40:04 GMT -5
that is not a true abs system, its basically a pressure relieve valve. it only allows you to hit the front brake so hard, and if it ever does what its supposed to do you need to top of you mc, and probably needs to be reset or adjusted. I don't know how to do it off the top of my head, I have never really messed with one
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Post by greginisn on May 14, 2018 23:23:56 GMT -5
When the "ABS" thing first came out on the Chinese scoots a lot of people took them off and tossed em cuz they hindered proper braking power.
I agree, it would be a good idea to re-check your original work just to be sure and give thought to leaving off the ABS thing upon reassembly.
You are right something IS wrong. I have a 2017 TaoTao Thunder and can grab all the front brake I want and or need to slow or stop the bike and it is totally controllable. And I was new to hand operated hydraulic front disk brakes but had years of drum fronts. In fact in most situations I couldn't realize the difference in operation from old to new systems.
Recheck your work, You'll get it sorted out.
Greg
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Post by katt on May 15, 2018 2:36:02 GMT -5
Thanks for the input everyone esp Tom and cagiva4ever for bringing ABS valve to my attention i thought that was automatic and had no idea its adjustable. Let me repeat my experience from yesterday, any SLIGHTEST pressure on the front brake would instantly lock the wheel and bike start skidding without even making any sound. Perhaps because it locks without my weight even transferred to the front of the bike (locked before front shocks were folded). That along with dramatically increased power due to cleaning carburetor made me afraid of riding it.
Now i rebuilt the caliper thankfully i already had repair kit and washed inside ABS valve and caliper with brake cleaner. There was some tough yellow hardened adhesive on both pistons and on the walls of caliper that brake cleaner would not remove even scratch it off with my nail was a hustle so i used 2000 grit sand paper until surface become smooth again.
ABS valve is just a simple mechanism all there is to it is a hex adjustment bolt on the bottom, spring and some plug with 2 ribber gaskets on it so that ABS valve is pretty straight forward and reliable. Not sure whats the procedure for adjusting it properly i never found any manual. So after i assembled everything and bleed the brakes i adjusted ABS valve bolt so it sticks out as much as possible then put a cap that screws over it and started tightening the cap turning adjustment bold along with the cap, before cap screwed tightly when hit the body of ABS sensor. I have done this because that adjustment valve can be turned with fingers and i did not was it unscrew itself. Now my front brake is back to the way it was originally except it still locks the wheel but not as fast as yesterday, its easy to release and reapply plus it makes nice skidding sound letting me know wheel is locked. When i tested along with rear brake (that i always use) IF at ~25mph i first press rear brake leaver and then front leaver scooter stops fast and in very short distance without skidding. If not ABS valve i would have opted for front drum brake downgrade, i feel its adequate for 49cc going up to 40mph. P.S. I have ordered rear brake shoes because right now rear brake does not do much if used on its own i expected it would do better. |
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Post by FrankenMech on May 15, 2018 2:56:24 GMT -5
My scoot has disc brakes on both front wheels, no ABS valve, just a 'T' splitter, and no brake problems. I can lock the front wheels up but I never need to. I have a rear disc brake also and use it.
Those ABS valves were never a good idea.
A person can lock up the front brakes on a car or truck if it doesn't have computerized ABS brakes. You just have to use the brakes wisely. It is just a matter of practice and experience. I would say it is probably better for you to never go where there might be ice, snow, sand, mud, gravel, oil, or even rain on the road that can give braking problems for a novice driver.
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Post by katt on May 15, 2018 15:41:05 GMT -5
Those ABS valves were never a good idea. How so?
T-Splitter meaning one leaver works on both front and back brake?
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Post by FrankenMech on May 15, 2018 18:20:24 GMT -5
My scoot has disc brakes on both front wheels. One lever operates the front disc brakes and another lever operates the rear disc brake.
ABS valves have always been a problem on scoots and motorcycles.
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