Tv175 disc brake squeal

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Davidsquaredson
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Posts: 222
Joined: Sun Jun 10, 2012 11:41 am
Main scooter: Early Eibar Jet 200
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Fri Dec 04, 2020 7:24 pm

Hi, I’ve got an original disc brake. New pads and copper grease ion their edges. Drilled out 3 holes in the disc to the slightly larger recommended size. Put copper grease on the 3 pins. Small amount, just enough to help free play

My brakes work well but are squealing. Any ideas why?

Thx in advance
DdImage

And those spots are wired in as my turn signals , and the correct seat is now on.
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carpe scooter diem

1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200

Warkton Tornado No.1
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Posts: 206
Joined: Mon Oct 17, 2011 6:16 pm
Main scooter: Lambretta SX200
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Sun Dec 06, 2020 1:17 pm

As you have received no responses, I'll state my opinion based upon experience.

The pads, being circular, tend to rotate, particuarly on the static side with it's central adjuster, which also means that it is pivotal with a low area of contact.

Copaslip is great stuff, but on the pad sides will encourage rotation.

TBH my road SX has a similar set-up to yours but I only lube the pads on their bases, & use sintered pads that I select to be a good fit. Fortunately, my brakes do not squeel, but if they did, I would introduce something to stop the rotation.

Within racing, prior to outboard discs becoming the norm, some riders used to go to the extremes of selecting pads with a small tab & notch a corresponding location slot in the backplate. Of course, if you were to notch the pads & fit a dowel 'half & half' to the backplate on both sides, this would achieve the same objective.

The other thing that the likes of LLRT did was to dispense with the adjuster & fit a shim beneath the static pad, effectively a large washer. Ha! In alloy for the weight saving!

We've been here before, but my preference is not to modify the disc itself & retain the anti-rattle circlip. If the disc is cleaned up meticulously on the bore & pin holes, along with the pins & disc spigot it will not bind up & will run truer. My belief is that the disc can flutter a tad & encourage the tendency to squeel.

If you could @ least refit the anti-rattle circlip (nicely Copasliped) then that too should help.

Davidsquaredson
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Posts: 222
Joined: Sun Jun 10, 2012 11:41 am
Main scooter: Early Eibar Jet 200
Contact:

Wed Jan 06, 2021 4:57 pm

Hey, thanks so much for this. I went with sintered pads and on the static side it was a very tight fit. I assumed that was wrong and sanded the edges to allow up / down motion. So I made it worse. Duh.

I will put this scoot up on the bench this weekend and pull the brake and start over, following your advice. Thanks again


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carpe scooter diem

1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200

Shipleystevep
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Joined: Wed Apr 23, 2014 8:34 pm
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Main scooter: Lambretta
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Thu Jan 07, 2021 5:48 pm

I can’t help I’m afraid, my SX200 squealed with cintered pads. I just put up with it and eventually it stopped on it’s own. I never found a solution.
As an aside, I’m not a fan anyway my well set up hub with shoes on my SX150 is a much better brake.

Warkton Tornado No.1
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Posts: 206
Joined: Mon Oct 17, 2011 6:16 pm
Main scooter: Lambretta SX200
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Fri Jan 08, 2021 3:32 am

Shipleystevep wrote:
Thu Jan 07, 2021 5:48 pm
I can’t help I’m afraid, my SX200 squealed with cintered pads. I just put up with it and eventually it stopped on it’s own. I never found a solution.
As an aside, I’m not a fan anyway my well set up hub with shoes on my SX150 is a much better brake.
"All sintered pads are equal, but some are more equal than others"

The really hard, racing pads appear to work @ their best when they get hot & are then very good. A different grade is better for road use, though I can't remember where I acquired the ones in my SX.

IMO the TV175 S1-2 drum brakes with reverse pull are extremely good & was all I could afford when I wanted to upgrade from cable disc in the 70's/80's. That said, the drum lacks feel in the wet & if you get the right pads, discs can work well, but more so with a good hydraulic as MSC used to sell.

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