Uneven braking

Message

spiderwheels · #16 Post by **spiderwheels** » Sun May 11, 2014 10:42 pm

D-Rider wrote:Could be material deposition if the pads were not bedded in correctly: http://www.stoptech.com/technical-suppo ... ther-myths

that article is certainly doing the rounds.. it seems to show up in every discussion of juddering brakes.

There are a number of options to explore..

Falco Frank · #17 Post by **Falco Frank** » Mon May 12, 2014 9:50 am

I have heard of ultra-hard deposits left on disc surfaces as a function of the high temperatures.

Apparently, nothing will remove this short of sanding the disc with very fine grade (1000+) wet and dry paper.

Oddly, I cleaned some discs recently and still wasn't happy with the results either so did (carefully) the above...

Time Will Tell.

Erm, yes - to digress, these Monsters are going on my Ducati for the meantime but I'm sure will end up on my Falco as they are fully compatible

M4 Monoblocs.

D-Rider · #18 Post by **D-Rider** » Mon May 12, 2014 12:22 pm

spiderwheels wrote:
D-Rider wrote:Could be material deposition if the pads were not bedded in correctly: http://www.stoptech.com/technical-suppo ... ther-myths
that article is certainly doing the rounds.. it seems to show up in every discussion of juddering brakes.

There are a number of options to explore..

We've been posting it on here for many years now - glad to hear other places are catching up

D-Rider · #19 Post by **D-Rider** » Mon May 12, 2014 12:25 pm

Falco Frank wrote:
Erm, yes - to digress, these Monsters are going on my Ducati for the meantime but I'm sure will end up on my Falco as they are fully compatible

Interesting non-radial mounting of "radial" callipers

Falco Frank wrote:
M4 Monoblocs.

Will they work on other motorways?

Falco Frank · #20 Post by **Falco Frank** » Mon May 12, 2014 2:20 pm

Sadly, I couldnt get the radial forks to fit either

and

Oh, yes - Autobahn's too (but they were bought with my Falco in mide).

#21 Post by **mangocrazy** » Tue May 13, 2014 9:06 am

Falco Frank wrote:Erm, yes - to digress, these Monsters are going on my Ducati for the meantime but I'm sure will end up on my Falco as they are fully compatible

M4 Monoblocs.

Mmmmmmmm - I like them very much.... The important question is, where did you get the caliper brackets from and how much are they?

spiderwheels · #22 Post by **spiderwheels** » Tue May 13, 2014 7:03 pm

Meanwhile, back on topic

The pads are fine. All 8 pistons were pushed back with finger pressure. I gave the calipers a clean up. The issue is no better so I'll assume the problem is as described in the article. I'm not sure I can go to all the trouble of sanding discs!

HisNibbs · #23 Post by **HisNibbs** » Tue May 13, 2014 7:49 pm

I usually give the brake a big squeeze every now and then. Always sorted it so far. PS don't try this advice in the wet, on diesel or without sensitivity....

Aladinsaneuk · #24 Post by **Aladinsaneuk** » Tue May 13, 2014 8:03 pm

Ok

Are all the bolts securing the disc correctly torqued up?

Suggest using a front paddock stand and checking the disks are true

spiderwheels · #25 Post by **spiderwheels** » Wed May 21, 2014 9:13 pm

The only thing I haven't been able to check is the disc runout as I don't have a front lift.

Sanding the discs by hand with various pieces of sand paper / wet and dry / thing that looks like a brillo pad but heavier duty hasn't made any different. I'm wondering if it would be worth getting the discs off and getting a sanding disc on my drill... (as well as checking the runout when I get a lift)

spiderwheels · #26 Post by **spiderwheels** » Sat May 31, 2014 7:20 pm

I finally got my front abba stand and sanded 7 hells out of the discs with my drill. Put everything back together and it feels exactly the same

Does anyone local to me have a dial guage?

The next MOT is next January so I will see whether or not it passes as is as I can live with the vibes. I will save up for discs. I need to spend some money on my forks...

fatboy · #27 Post by **fatboy** » Sun Jun 01, 2014 7:22 pm

Do your discs (rotors) show any signs of overheating ?
If so this can alter the properties of said disc and affect the pads ability to grip, likewise are the pads glazed ?
Maybe try a different pad compound ?

spiderwheels · #28 Post by **spiderwheels** » Mon Jun 02, 2014 7:48 pm

There are no signs of over heating - no visible signs of any issues at all.

The purpose of sanding them was to remove any glazing and/or pad material deposits and start again with a fresh surface.

Maybe the previous owner warped them with a disc lock

Moose · #29 Post by **Moose** » Mon Jun 02, 2014 10:32 pm

I had this problem, brake cleaner didn't work, bolt & nut through hole connected to cordless drill, two tins of cleaner, made no difference.

I removed the rotors, and popped the "clips" on the inside of the bobbin (they were facing the disc's) so they faced out this made them float and the problem went away.

I am sure I read "how to" on this forum.

This link is to a picture of the clip.

http://trialstribulations.net/images/pr ... 24x768.jpg

spiderwheels · #30 Post by **spiderwheels** » Tue Jun 03, 2014 5:13 pm

Moose wrote:I had this problem, brake cleaner didn't work, bolt & nut through hole connected to cordless drill, two tins of cleaner, made no difference.

I removed the rotors, and popped the "clips" on the inside of the bobbin (they were facing the disc's) so they faced out this made them float and the problem went away.

I am sure I read "how to" on this forum.

This link is to a picture of the clip.

http://trialstribulations.net/images/pr ... 24x768.jpg

Thanks.

Edit: so somehow the clips have popped themselves the wrong way over time and use?