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Re: Front Brakes Rubbing

PostPosted: Mon Apr 25, 2016 3:10 pm
by Ryan92
pch1 wrote:
Ryan92 wrote:
SMUDGER wrote:Put on stand. Face head on to the wheel spin it fast and watch very closely at that brake disc it could have a in tolerance bend that catches the pad hence you can hear it the faster u go

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It could well be this, had a look just now and it's hard to see but there's a point that sounds like it's catching on each revolution. Is getting the braking faces skimmed an option here to get them flat, or is it just a replace job?


Skimming discs is not an option.
Skim a disc with too fine a finish and you can land up arse over tit (front wheel lock up).
Some brake discs eventually get hard spots (often incorrectly identified as warped disc) in them, no amount of skimming will change the material properties of the disc.

The correct thing to do is to replace both disc and brake pad, if the disc is worn beyond specification, with grooves etc and the brake pad has taken its shape.



I'm replacing the pads as they'd worn unevenly, I think I've sorted that issue out though now. If I'm getting no issues with braking apart from a slight noise it's rotating, I assume it's OK to leave as is?

Re: Front Brakes Rubbing

PostPosted: Mon Apr 25, 2016 5:24 pm
by pch1
Ryan92 wrote:
pch1 wrote:
Ryan92 wrote:[quote="SMUDGER"]Put on stand. Face head on to the wheel spin it fast and watch very closely at that brake disc it could have a in tolerance bend that catches the pad hence you can hear it the faster u go

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It could well be this, had a look just now and it's hard to see but there's a point that sounds like it's catching on each revolution. Is getting the braking faces skimmed an option here to get them flat, or is it just a replace job?


Skimming discs is not an option.
Skim a disc with too fine a finish and you can land up arse over tit (front wheel lock up).
Some brake discs eventually get hard spots (often incorrectly identified as warped disc) in them, no amount of skimming will change the material properties of the disc.

The correct thing to do is to replace both disc and brake pad, if the disc is worn beyond specification, with grooves etc and the brake pad has taken its shape.



I'm replacing the pads as they'd worn unevenly, I think I've sorted that issue out though now. If I'm getting no issues with braking apart from a slight noise it's rotating, I assume it's OK to leave as is?[/quote]

All depends on the lengths you're prepared to go and the depths of your pockets.

If your bike is used for commuting and occasional track day, then a bit of noise isn't much of an issue. Bear in mind that it can be subjective and a bit of noise to you might be blissful silence to an old git like Cabernet (different strokes, same old folks etc).

Now...if you were entering the world's longest free wheeling contest and Guinness world records were on standby to officiate the record; then I'd definitely look into the noise. Energy is neither created nor destroyed, but converted from one form to another.
The noise may well be forward propulsion energy being lost and converted into unnecessary harmonic frequencies resonating on your eardrums.

PS Tongue in cheek

Re: Front Brakes Rubbing

PostPosted: Mon Apr 25, 2016 5:55 pm
by Cabernet
Pardon?

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Re: Front Brakes Rubbing

PostPosted: Tue Apr 26, 2016 3:05 pm
by Marco
Can I just tag onto this. I have just replaced my front brake pads and now the front wheel is quite stiff is this normal till they bed in? It's been a while since I replaced brake pads and can't remember what happened last time


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Re: Front Brakes Rubbing

PostPosted: Tue Apr 26, 2016 3:17 pm
by Cabernet
Marco wrote:Can I just tag onto this. I have just replaced my front brake pads and now the front wheel is quite stiff is this normal till they bed in? It's been a while since I replaced brake pads and can't remember what happened last time


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No.
Put the girlfriends coat over the tank.
Then take the top off the master cylinder resvoir.
You may well have compressed the last of the gas in the top and it is holding some pressure on the system.
If left you could boil the brake fluid and that is not fun.
The lever will come back to the bar with no front brake applied.
Had this on Cadwell Park race circuit.
Thank heavens for the exit slip at the end of the "hall bends" :o .

Re: Front Brakes Rubbing

PostPosted: Tue Apr 26, 2016 4:01 pm
by Marco
Cabernet wrote:
Marco wrote:Can I just tag onto this. I have just replaced my front brake pads and now the front wheel is quite stiff is this normal till they bed in? It's been a while since I replaced brake pads and can't remember what happened last time


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No.
Put the girlfriends coat over the tank.
Then take the top off the master cylinder resvoir.
You may well have compressed the last of the gas in the top and it is holding some pressure on the system.
If left you could boil the brake fluid and that is not fun.
The lever will come back to the bar with no front brake applied.
Had this on Cadwell Park race circuit.
Thank heavens for the exit slip at the end of the "hall bends" :o .


The cap was off the reservoir when I bled them back I didn't keep hold of the brake when I put the cap back on so I don't think that will work just taking the cap off again or am I wrong?

Re: Front Brakes Rubbing

PostPosted: Tue Apr 26, 2016 5:38 pm
by Cabernet
Did you clean the pistons?

Re: Front Brakes Rubbing

PostPosted: Tue Apr 26, 2016 6:07 pm
by Marco
Yep I cleaned them. Went out and released the pressure and did it again. Same problem


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