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Disc brake caliper lever bumps into caliper body

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Disc brake caliper lever bumps into caliper body

Postby one_half_3544 on Tue Sep 06, 2011 9:11 pm

Hi!

Subpart #2 (of 340-04/240-04 - brake caliper) bumps into subpart #1 when brake pads are worn heavily:
Image
If the outer pad is already screwed inward at full, the brake does not work and there is no way of adjusting it.
But it happens that brake pads are still usable at this moment - 5 minutes of 'upgrading' with a file and their life is slightly prolonged:
Image

So, I just wanted to ask - is this a design flaw or is it intended?
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Re: Disc brake caliper lever bumps into caliper body

Postby Blackstridaaustria on Tue Sep 06, 2011 10:23 pm

one_half_3544 wrote:...or is it intended?


I don't think so, because there is a difference between front and rear caliper:
The front caliper lever does not touch the subpart #1 (tried on loose calipers without rotor).

You are showing the rear caliper - is that correct?

Are you searching for brake pads?
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Re: Disc brake caliper lever bumps into caliper body

Postby one_half_3544 on Wed Sep 07, 2011 7:12 am

Blackstridaaustria wrote:
one_half_3544 wrote:...or is it intended?


I don't think so, because there is a difference between front and rear caliper:
The front caliper lever does not touch the subpart #1 (tried on loose calipers without rotor).

You are showing the rear caliper - is that correct?

Yes, this is the rear caliper. I thought that they are identical :oops:

Are you searching for brake pads?

Not yet - current pads will work a bit more =)

Maybe I should have posted this to 'riders reports' section.
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Re: Disc brake caliper lever bumps into caliper body

Postby Blackstridaaustria on Wed Sep 07, 2011 6:28 pm

one_half_3544 wrote:I thought that they are identical


I think they ARE identical, in technical sight!

Image

The calipers are built in mirror symmetry, there is a "left" and a "right" one.

Image

I really cannot understand why that has effect to the function. :?

Image

But there IS a difference.

Image

Tried today two caliper pairs - only the rear caliper levers touched the caliper bodies. :?:

To the pads:
Assuming that the identification Hayes MX2/MX3 is correct - there should exist different types of pads : semi-metallic, sinter and kevlar.

http://torontocycles.com/Selling/Pads.html

I think it might be worth a try to test these types.
(And to figure out which type is originally used.)
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Re: Disc brake caliper lever bumps into caliper body

Postby one_half_3544 on Mon Sep 12, 2011 6:45 pm

Blackstridaaustria wrote:To the pads:
Assuming that the identification Hayes MX2/MX3 is correct - there should exist different types of pads : semi-metallic, sinter and kevlar.

http://torontocycles.com/Selling/Pads.html

I think it might be worth a try to test these types.
(And to figure out which type is originally used.)


OK =)

Image
left to right:
strida original
clarks MX2 organic pad
EBC MX2/MX3/sole sintered pad
hayes sole original pad
(I don't have any semi-metallic pads)

Strida pad looks like organic.

To the caliper - the problem with the rear caliper was/is that it is not centered - outer pad was almost worn out, but the inner pad still had much meat on it. Guess I will have to chop some metal from the frame to adjust it.
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Re: Disc brake caliper lever bumps into caliper body

Postby Blackstridaaustria on Mon Sep 12, 2011 8:58 pm

Many thanks,

one_half_3544 wrote:Guess I will have to chop some metal from the frame to adjust it.


Please be careful, wouldn't it be better to change the pads?

You seem to be a "high-miler", which I am definitely not, maybe the inner and outer pads should be changed against each other from time to time?
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Re: Disc brake caliper lever bumps into caliper body

Postby Edd on Tue Sep 13, 2011 1:46 pm

Please don't go chopping some metal on the brakes because it's in the way just to save like $10 of brake pads at most. Because that piece of metal is there to prevent the brake cable from flexing too much when you pull and release. With that piece of metal gone it will be bent at a greater angle every time you brake and eventually it will snap on you when you really need it!! :shock:

every part on the strida was designed with a purpose I don't think they went through 5 generations of changes to only keep that one part to make you buy new pads earlier.
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Re: Disc brake caliper lever bumps into caliper body

Postby one_half_3544 on Thu Sep 15, 2011 8:30 pm

Blackstridaaustria wrote:maybe the inner and outer pads should be changed against each other from time to time?


This is a possible solution, but switching pads requires removing/installing caliper or the rear wheel, which is inconvenient.

Edd wrote:Please don't go chopping some metal on the brakes because it's in the way just to save like $10 of brake pads at most. Because that piece of metal is there to prevent the brake cable from flexing too much when you pull and release. With that piece of metal gone it will be bent at a greater angle every time you brake and eventually it will snap on you when you really need it!! :shock:

Hmm. Possible. But why is it done so on the rear caliper only?
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Re: Disc brake caliper lever bumps into caliper body

Postby Serious on Wed Jul 25, 2018 12:57 pm

Not sure if it is still actual but making lever go further than it suppoed to WILL result in brake caliper failure. Inside a caliper there is a piston. Piston is made out of two cylinders, one is has a notch preventing it prom turning, other turns freely. Between cylinders there are 3 metal balls that gave grooves that they sit in.Grooves have dynamic depth. When lever is pulled the turning cylinder spins and balls are pushed out of deeper grooves and made to go up to less deeper part of a groove. That pushes the piston that pushes the prake pad. If cylinder is turned too much balls fall out of their groves and braking mechanism fails. To repair it you have to take caliper apart and lace balls back to their grooves.
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Re: Disc brake caliper lever bumps into caliper body

Postby ewenement1984 on Mon May 11, 2020 6:27 pm

Hi, I have problem brake disc touching the caliper brake. Refubrished Strida and chagned all washers and brake discs follows the official plan.



Image
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Re: Disc brake caliper lever bumps into caliper body

Postby Blackstridaaustria on Mon May 11, 2020 6:59 pm

Hi,
pardon me, but that image is a little bit small and dark...

I guess you missed to install two washers;
between each one which is in direct contact with the caliper (that convex - concave connection)
and the frame lugs
there has to be another, flat washer.

Hint: At the original drawing / detail 240-04 you can see four times part nr. 7
- even if just two pairs of the parts are identical!
Sadly not good visible on that image below, please disregard the blue arrow:
Image

Thank you very much for reminding - that is misleading issue nr. 3 at the manual!
:?

Impossible to verify at your image; it needs to be bigger, brighter and a little bit more to the right to see that.
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Re: Disc brake caliper lever bumps into caliper body

Postby ewenement1984 on Tue May 12, 2020 12:16 pm

Hi sorry I been so frustrated because forum don't allow me login for last 3 days :)

https://www.flickr.com/photos/185105605@N08

Can you look that?

I'm uploading YT Video is well..
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Re: Disc brake caliper lever bumps into caliper body

Postby Blackstridaaustria on Tue May 12, 2020 1:26 pm

Hi Damian,

welcome at Stridaforum :D

Please pardon me for assigning your post to the wrong user first.

You were logged in the last time today at 10:28 and you were visible,
could you please try again?

Cheers,

Chris
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Re: Disc brake caliper lever bumps into caliper body

Postby ewenement1984 on Tue May 12, 2020 1:38 pm

Blackstridaaustria wrote:Hi Damian,

welcome at Stridaforum :D

Please pardon me for assigning your post to the wrong user first.

You were logged in the last time today at 10:28 and you were visible,
could you please try again?

Cheers,

Chris


Hi, Yeah everything is working currently... don't know how long it will... had some Forbidden 404 errors and can't contact with anybody from forum at private message.

Attaching video: https://youtu.be/DUShDcytcm0

Many thanks to Mark Salo who I spoke on Instagram - he helped me a lot! GOOD LAD!

Sorry if I messed up something in your forum :)
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Re: Disc brake caliper lever bumps into caliper body

Postby Bill Wilby on Tue May 12, 2020 2:32 pm

Hi Damian, I hope this photo helps, on a front caliper the bolt and washer should fit like this. The thick washer with the curve in it matches the curve on the caliper, this helps align the caliper to the plane of the brake disk when tightened. The small silver washer fits under the bolt head. Image

Cheers, Bill
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