losing the back under front braking...sometimes?

[darrsi]

[quote author=Val link=topic=22883.msg266297#msg266297 date=1502925478]
[quote author=locksmith link=topic=22883.msg264230#msg264230 date=1499629377]
Just a thought, are you changing down as you do this?, the rear will lock up quite easily due to the strong engine braking.

Nope I rarely do that. If I change down usually I don't use the brake until last few meter before stopping, because the engine braking is very strong on MT09.

That happens only when I need the brake - something happens and I need to use the front brake in a sharpish way.

Update today I was overtaking few cars with 70ish or more and I was in the opposite lane while doing that. The lane was straight and free more then 500-600 meters ahead. A car has popped up from a driveway in front of me in the lane. Luckily there was enough distance. The front brake was pulsing hard at the lever when braking from speed and the whole front was jumping like going through speed bumps.

Any ideas?
[/quote]


I'd put some money on warped disc.
[/quote]


It's a common misconception to blame a warped disc, but as i found out the hard way it's not always the case even if all the signs point in that direction.
The trouble is, you have to spend a fortune on discs to find out if it is them or not. They're not as easy to check as people make out unless they're completely shot.
If you consider warped discs then you have to back track and see if there's a reason why they would warp, like a sticking piston for example.

[locksmith]

My reason for saying that being that in a car I had a terrible juddering when braking heavily from speed, yet normal braking at normal speeds was unaffected. Turned out the discs were badly worn and replacing them was the cure. Now I assume am MT, a couple of years old won't have worn discs, so I mention warped. Possibly just slightly untrue just enough to give the heavy braking symptoms.

[darrsi]

My reason for saying that being that in a car I had a terrible juddering when braking heavily from speed, yet normal braking at normal speeds was unaffected. Turned out the discs were badly worn and replacing them was the cure. Now I assume am MT, a couple of years old won't have worn discs, so I mention warped. Possibly just slightly untrue just enough to give the heavy braking symptoms.

We're talking about semi floating discs though, it would take some savage race type maniac braking to warp them through heat for example.
Sticking piston certainly could cause issues but i would've though Val would've picked up on that earlier.
He actually described perfectly what i was getting before, as if you are braking on a cobbled road.