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**Noor** · 08-10-2011, 06:00 PM

Thread approved

**rx100.7050** · 08-10-2011, 06:08 PM

Originally posted by Divya Sharan View Post

Hi friends,

Recently I bought the Karizma ZMR. I've ridden the ZMA-R quite a lot, so I was confident of pulling it through with the new one too.
But I have observed this thing twice, whenever I brake hard at speeds around 50-60, the rear portion skids. Thankfully, I never fell off. I use both discs for applying brakes.
I didn't notice this problem with Karizma R or with Pulsars (drummed ones).
Is my braking technique faulty?

Happens when you first move to dual disc bike. Try to do most of the braking on the front disc. Rear disc should be used as a support. You will get used to it. There is a fantastic article on braking by old fox in the one of the XBHP magazine's previous issue. Go through it.

**sharingan** · 08-10-2011, 07:11 PM

^+1

On my r15 too I use only the front. Only in uncertain conditions I start using rear because I prefer to slip the rear and not front..
The rear wheel cannot produce much stopping power hence most bikes dont have disk brakes at rear.

**Divya Sharan** · 08-10-2011, 07:30 PM

Originally posted by sharingan View Post

^+1

On my r15 too I use only the front. Only in uncertain conditions I start using rear because I prefer to slip the rear and not front..
The rear wheel cannot produce much stopping power hence most bikes dont have disk brakes at rear.

@Sharingan:
True, but I experience the skid factor only when I ride alone. With a pillion, all is well. So does is mean that a pillion adds stability to the ride?

**driftjockey** · 08-10-2011, 07:40 PM

Try using a 65% front and 35% back combined..

**Divya Sharan** · 08-10-2011, 09:06 PM

Originally posted by driftjockey View Post

Try using a 65% front and 35% back combined..

Ok, but is there any method for automating the control for discs? I mean like drum breaks where we just need to tighten the screw and the break becomes more responsive. Is there any such setting possible?

**aargee** · 08-10-2011, 09:36 PM

None!!!!!!

**nirmaldas** · 08-10-2011, 09:51 PM

Originally posted by Divya Sharan View Post

@Sharingan:
True, but I experience the skid factor only when I ride alone. With a pillion, all is well. So does is mean that a pillion adds stability to the ride?

i believe i read this somewhere in xbhp itself that more weight => more friction => less skidding

tyre skids when there is less friction between the road and tyre surface.
a pillion sitting adds more weight to the rear, more weight => more friction & hence due to more friction tyre does not lock up and less skidding...

and front braking is more effective because there is more weight towards the front. & while braking rider tends to move forward adding more weight to the front tyre.

**princesirohi** · 08-10-2011, 11:20 PM

not a big problem dear, you simply have to recalibrate your braking style. use front brake more than rear. and when using rear brake, use it slowly and smoothly, remember no sudden jerks.

you should be fine.

**rohitsapru** · 08-11-2011, 01:42 AM

You are not alone.

I have skidded and fallen twice on my ZMR. I think it was because I locked up my rear wheel in panic braking, but I do not know this for certain.

Use 80-100% front brake and 0-20% rear brake. Don't brake hard. Press the lever in gradually stepping-up fashion, I am failing to describe it the way I want to, there is another post in Xbhp about the correct braking method. And try to ride in a safe style so that you don't need to resort to panic braking.

Switch the rear tyre to Michelin Pilot Sporty, it is the same specification as the stock one. I haven't yet found a replacement tyre for the front with stock specs.

After riding in a more sane and safe manner, and changing the stupid stock rear tyre, I have not skidded or fallen again.

**sharingan** · 08-11-2011, 02:34 PM

Originally posted by Divya Sharan View Post

@Sharingan:
True, but I experience the skid factor only when I ride alone. With a pillion, all is well. So does is mean that a pillion adds stability to the ride?

Not exactly stability.. the pillion shifts the balance to the rear, so more weight on the rear making the rear brakes more useful.

My advice: use rear only when the conditions are a little uncertain to use the front. On a clear tarmac road there is absolutely no reason to use the rear.. If you make a habit of always using the rear too, in panic situations you might just go hard on the foot causing the rear to slip..
one more thing: use the disk brakes progressively and not at one go. bikes give excellent feedback of the front wheel making it easy to understand the grip etc. The rear hardly gives any feedback so you will have to observe the conditions and calculate how much you can exert.

Once you get used to the bike, you will know when the wheels are about to slip and how much of slip you can control..call it the human intuitive ABS :P

**Prith** · 08-11-2011, 02:53 PM

Though theory of pillion adding to higher friction and more downforce is plausible, the best option is changing your braking style. Go for front brakes at first instance (gentle, not jamming), and if need arise go for rear brake. Hard braking with rear brake jamming will surely cause trouble depending on road condition and riding experience. If possible lessen your rear tyre's pressure by couple of psi (may affect your fuel economy), but worth it during monsoon.

**stefanm** · 08-11-2011, 03:22 PM

I just use the front, only on certain occasions you will need to use the rear, I had started a thread about riding tuition videos, I suggest you either buy them or download them and practice what they preach, really worthwhile if you're serious about biking http://www.xbhp.com/talkies/pit-stop...ighlight=video street smarts and twist of the wrist 2 are both fantastic must see vids, you will learn a lot from them, you can find the links to them by a simple torrent search.

The purpose of my original thread is that guys on here will obtain the videos, try the techniques and discuss the contents, very little feedback is there though!

**Divya Sharan** · 08-11-2011, 08:38 PM

@All: Thnx a lot guys.. You really make a person feel content... I shall employ all techniques mentioned by all & I'll find the best option for me...

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Using rear disc causes bike to skid : Braking technique fault?

Using rear disc causes bike to skid : Braking technique fault?

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