what are the factors that affect brake locking?

[NeolWhyt]

Hey guys, I'm new here. I just wanted to know what are the qualities that causes disc brakes to lock up. Because I used Bajaj Pulsar 200 ns. And its brakes are super sensitive which is sort of annoying cuz, just jamming the rare brakes at around 80kmph causes the brakes to lock up. But when I do the same speed on an R15 and jam the brakes it doesn't lock up but provides equally efficient braking. So what exactly do I need to notice about brake specs to know if they lock up easily?
Thanks in advance.

[Islander]

Simple answer? The friction between the tyre and the road surface is the main factor decent tyres are the obvious thing here but keeping an eye on the road surface is important too. Progressive braking makes a difference as well - i.e. not snatching at the brakes but applying them firmly and progressively.

[NeolWhyt]

[c_dug]

The biggest factor of all is rider technique, "jamming" on the brakes will cause them to lock.
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[Rogerborg]

So, you've cleaned your caliper and pistons, and ensured that the M/C piston isn't being held in by the brake lever?
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[NeolWhyt]

[NeolWhyt]

[RhynoCZ]

Yamaha, a rather respected motorcycle manufacturer vs. Bajaj.

I'm not sure what brakes do these come with, but I am sure Yamaha wouldn't sell a dangerous piece of crap with their brand on it.

MC = Master cylinder, the pump that's on your right handlebar and you operate it with the brake lever.

Brake pads, the suspension, frame geometry... are also very important

EDIT: Tyres are not as important as people would think, when being o dry tar on smaller/light motorcycle. I've done some miles on my mates 150 ETZ and there's a very hard compound front tyre, that's, at a guess, 10+ years old. I got into trouble a couple of times, and grabbed the front brake, the wheel never blocked. I wouldn't ride it fast in wet, but on dry tar, it's alright. And that my friend, is a disc front brake made in the wrong part of the Germany 30 years ago.
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'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Rogerborg]

[NeolWhyt]

[NeolWhyt]

yeah everything is supposedly how it should be.. I had specified the service centre to take a look at the brakes.. And no, everything is stock...

[RhynoCZ]

[Rogerborg]

[misscrabstick]

Did the Yamaha have ABS?

[Taught2BCauti...]

Brakes work by converting the energy of motion into heat, through the friction created between the disc pad and the disc, which is then dissipated into the air by the rotation of the disc.

When the brake locks, this process stops working, so the only thing slowing you down is the friction between the tyre and the road - which is usually not as efficient, because weight is being shifted forwards, and the contact surface between rubber and tarmac is reduced.

If the 2 bikes have the same weight distribution, and too much pressure is applied to the 'rare' or rear brake on the Pulsar, that would cause it to lock up.

One thing to look at here, would be the relationship between the diameters of the pistons in the master cylinder and the caliper, and the length of the brake pedal either side of the pivot point on both bikes, as this would determine the amount of pressure applied to the pads for the same amount of foot pressure.

On the other hand, if you know this to be a problem, simply get used to using a little less pressure on the rear brake, and perhaps a little more on the front.
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[Rogerborg]

[c_dug]

One other thing, if you can't deliberately lock the Yamaha rear break, even by slamming it on suddenly, it would suggest to me a problem there too.

Most bikes, especially Ultra-uber-epic-sports bikes such as the R125 should lock the rear up with ease.
____________________
I am a bellend, I am a man of constant sorrow, I am a gummy bear, I am a rock.

[Taught2BCauti...]

If you break your brake, will it be bracken?
____________________
Honda Varadero XL125(V8)
www.TheFutureIsHere.eu

[Acemastr]

[RhynoCZ]

[salem1987]

a yammy with blue spot callipers an decent pads or whatever (something decent) is going to lock a 15 year old rock hard tyre quicker than a brand new super soft and sticky sc0 supercorsa tyre no?

[Acemastr]

[Carvel]

[RhynoCZ]

What are we talking about? I said a small = LIGHT, motorcycle on dry tar. You then went to 200kg+ 1000cc superbikes.

I did what I did on a '88 150 ETZ equipped with 10+, my mate says 19, years old front tyre, hard as rock and I'm still here. OP is talking about R15 and some Bajaj 200.

I say tyres are not the answer to every question you have, and that's it.
____________________
'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Acemastr]

It clearly is the tires if they are locking... that shows there's plenty of bite from the brakes and it overcomes the traction of the tire...
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