SQUEEEAAAAAKKK!!!!!!
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mr.b



Joined: 04 Sep 2011
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PostPosted: Thu Dec 29, 2016 11:34 am    Post subject: SQUEEEAAAAAKKK!!!!!! Reply with quote

Went to go for a short ride this morning as it's been far too long.
To find a horrid squeak from my bike.
I aborted my ride rather sharpish and returned home
Located the noise to the front disc.
Tried to realign the front wheel but it seems the calliper is slightly skew to be disc
I have checked the disc a it's pretty much as true as it could be being 5 years old
Is it just a case of slackening off the calliper mount and adjusting it from there?

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MPX309



Joined: 17 Jul 2014
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PostPosted: Thu Dec 29, 2016 12:48 pm    Post subject: Reply with quote

What brakes are they? Usually lighter plastic body calipers (like shimano), yes you can slacken the bolts. . . tie an elastic band around the brake lever and the handle to clamp it up tight, n slowly tighten them up again and you're pretty much straight.

I found with my Hopes (or possibly other big metal calipers) this doesn't work so well, it was easier for me to face the bike against a light (or even just a window) so i could see through, tighten one side down ever so gently, and the other and keep going back and fourth slowly until it's running with no rubbing.

But are they squeaking or rubbing? if it's squeaking it could just be some sort of oil or residue on the pads/rotor?

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mr.b



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PostPosted: Thu Dec 29, 2016 1:09 pm    Post subject: Reply with quote

Ones that came on the bike Very Happy
Tekko maybe? Hydrolic ones anyway they look metal but to be fair I have really looked so I assume it's metal
Will there be any play in the mount as it looks like a tiny amount?
Think it has be resting on something in the shed Rolling Eyes

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mr.b



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PostPosted: Thu Dec 29, 2016 1:12 pm    Post subject: Reply with quote

Defo a squeak, I ran with brake on for a bit to see if there was some suface contamination but it didn't help
Will have a look as the wife has guests this afternoon and in have to pretend to like them Wink

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giantAstax



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PostPosted: Thu Dec 29, 2016 7:50 pm    Post subject: Reply with quote

MPX309 wrote:
What brakes are they? Usually lighter plastic body calipers (like shimano), yes you can slacken the bolts. . . tie an elastic band around the brake lever and the handle to clamp it up tight, n slowly tighten them up again and you're pretty much straight.


This is not good practice. I did a mechanic course and the prescribed method is.....

1. Remove the wheel
2. Check the disk rotor isn't bent or warped. Straighten or replace as necessary.
3. Remove and check pads. Are they evenly worn on both sides. If not replace.
4. Check pistons move in and out freely and evenly. If not use a brake cleaner and clean the pistons.
5. Refit the wheel but not the pads
6. Loosen the calliper mounting bolts so you can just move the calliper
7. Visually align the calliper so that the gap either side of the rotor is identical. Most callipers can be aligned easily.
8. Once correctly aligned carefully tighten the caliper bolts making sure the caliper doesn't shift.
9. Refit the pads. No more pad rubbing guaranteed

As for brake squeal, there are loads of potential causes and unfortunately some pads just squeal even from new. You could try thoroughly cleaning the rotor, clean the pads, run the brakes very lightly, then progressively increase lever pressure and wheel speed and eventually do several emergency stops. This may sort your problem or may not.

I have two bikes with identical setups and one squeals badly in the wet the other is fine. You may just have to live with it.
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mr.b



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PostPosted: Thu Dec 29, 2016 11:32 pm    Post subject: Reply with quote

Haven't factored in the wet weather, it wasn't raining but was damp/moist.
The squeak didn't start straight away but around 250m down the road.
The calliper is slightly skew to the disc so will need to be sorted any how.
Thanks for the walk through on alignment

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KTM540



Joined: 24 Sep 2013
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PostPosted: Fri Dec 30, 2016 11:06 am    Post subject: Reply with quote

MPX309 wrote:
What brakes are they? Usually lighter plastic body calipers (like shimano)



"Plastic body calipers" ........ ??? Shocked Shocked

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KTM540



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PostPosted: Fri Dec 30, 2016 11:10 am    Post subject: Reply with quote

giantAstax wrote:
MPX309 wrote:
What brakes are they? Usually lighter plastic body calipers (like shimano), yes you can slacken the bolts. . . tie an elastic band around the brake lever and the handle to clamp it up tight, n slowly tighten them up again and you're pretty much straight.


This is not good practice. I did a mechanic course and the prescribed method is.....

1. Remove the wheel
2. Check the disk rotor isn't bent or warped. Straighten or replace as necessary.
3. Remove and check pads. Are they evenly worn on both sides. If not replace.
4. Check pistons move in and out freely and evenly. If not use a brake cleaner and clean the pistons.
5. Refit the wheel but not the pads
6. Loosen the calliper mounting bolts so you can just move the calliper
7. Visually align the calliper so that the gap either side of the rotor is identical. Most callipers can be aligned easily.
8. Once correctly aligned carefully tighten the caliper bolts making sure the caliper doesn't shift.
9. Refit the pads. No more pad rubbing guaranteed

As for brake squeal, there are loads of potential causes and unfortunately some pads just squeal even from new. You could try thoroughly cleaning the rotor, clean the pads, run the brakes very lightly, then progressively increase lever pressure and wheel speed and eventually do several emergency stops. This may sort your problem or may not.

I have two bikes with identical setups and one squeals badly in the wet the other is fine. You may just have to live with it.


This is the correct method and the only one that should be used in my opinion, tho as stated in #4, the pistons need to be moving at equal amounts, and at the same time .. if not, and you're not confident in stripping the caliper, a LBS will sort it for a few quid Wink

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MPX309



Joined: 17 Jul 2014
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PostPosted: Fri Dec 30, 2016 1:24 pm    Post subject: Reply with quote

KTM540 wrote:
MPX309 wrote:
What brakes are they? Usually lighter plastic body calipers (like shimano)



"Plastic body calipers" ........ ??? Shocked Shocked


lol dont now, think i might been on drugs when i responded to this. sorry. lol

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KTM540



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PostPosted: Sat Dec 31, 2016 11:42 am    Post subject: Reply with quote

We'll put that one down to seasonal mince pie poisoning aye .. Laughing
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mr.b



Joined: 04 Sep 2011
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PostPosted: Sat Jan 21, 2017 4:16 pm    Post subject: Reply with quote

All sorted now, realigned the calliper took about 30mins as it moved as i tightened the bolts Rolling Eyes
Quick test ride and some heavy braking and all is well Very Happy
May try get out for a ride tomorrow

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