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Frequent disc brake adjustments...grrr

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Frequent disc brake adjustments...grrr

Old 06-01-17, 05:54 PM
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wannabemekon
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Frequent disc brake adjustments...grrr

I've had my shimano hydraulic disc brakes for about 6 month now and of late they are making me a bit nuts with their need for frequent adjustment. Is this a sign I need to bleed them? Clean them?

And is it normal for disc brakes to go out of alignment if you transport the bike lying on its side without the wheel on?

merci
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Old 06-01-17, 07:38 PM
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Hydraulic brakes should be fit and forget till the pads need replacing.

Are you fitting the supplied travel spacer when removing the wheel(s)? also, is there any sign of leakage from the reservoir when you have moved the bike on it's side?
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Old 06-01-17, 08:45 PM
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Originally Posted by wannabemekon View Post
I've had my shimano hydraulic disc brakes for about 6 month now and of late they are making me a bit nuts with their need for frequent adjustment. Is this a sign I need to bleed them? Clean them?

And is it normal for disc brakes to go out of alignment if you transport the bike lying on its side without the wheel on?

merci
what is the symptom that makes you adjust them? Maybe warped rotor or dirt?

I don't think air causes that, but you should bleed anyway and clean the piston etc.
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Old 06-01-17, 08:54 PM
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QR wheels?
I'm guessing the problem isn't the brake, it's the wheel not winding up in the same position.
When dealing with QR wheels and disc brakes, you need to make sure the wheel is always getting back to the EXACT same position. That means keeping the bike vertical, and putting the wheel in, making sure it's pushed all the way up. Then make sure the QR lever is closed TIGHT. Not snug, it needs to be TIGHT, it should leave a mark on you hand from closing it.

Do that once, then line up the brakes, and you should be good from there on.
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Old 06-02-17, 12:14 PM
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wannabemekon
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Originally Posted by jimc101 View Post
Hydraulic brakes should be fit and forget till the pads need replacing.

Are you fitting the supplied travel spacer when removing the wheel(s)? also, is there any sign of leakage from the reservoir when you have moved the bike on it's side?
No, Wasn't using the spacer. Will try that. Duh!
No leakage from anywhere. Nice and clean.


what is the symptom that makes you adjust them? Maybe warped rotor or dirt?
standard disc brake rubbing sound. dirt is easily dealt with by braking or a squirt from the water bottle...

the rotor may be a tad warped, which i don't understand why it'd be so.

but i noticed today on a ride in the mist/rain that hitting a bump causes the brakes to rub, sometimes for a while. and a hard effort, especially in a big gear standing, causes temporary rub.

[QUOTE]QR wheels? [/QUOTE/

thru-axle on the front, so they should be consistent in their alignment, though i wonder about how flexible the carbon fork is sometimes. rear is QR. i'm good about aligning the wheels, and rarely remove the back wheel. i mean, i basically know what i'm doing but discs are new (and increasingly annoying) territory for me.

this feedback is making me think i may as well do a bleed and clean of the system next rainy spell that keeps me off the road.
thanks
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Old 06-02-17, 12:55 PM
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Originally Posted by wannabemekon View Post
this feedback is making me think i may as well do a bleed and clean of the system next rainy spell that keeps me off the road.
thanks
Make sure the mounting bolts (on the caliper and disc) are tight as well. Although I'm sure you've already checked that.

Yes, you are quickly discovering why disc brakes are annoying and to me, not worth the trouble on anything but a mountain bike ACTUALLY used for mountain biking.

My guess is you may have a sticky caliper so a strip and clean would work well.

Chalk up another "my disc brakes don't work well/make noise" thread.
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Old 06-02-17, 01:02 PM
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Be sure the problem is with the brakes and/or calipers and not wheel alignment. The latter can be an on-going issue. I've had mine since 2014 and there is no getting around the fact that they are finicky.
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Old 06-02-17, 01:31 PM
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Originally Posted by wgscott View Post
Be sure the problem is with the brakes and/or calipers and not wheel alignment. The latter can be an on-going issue. I've had mine since 2014 and there is no getting around the fact that they are finicky.
He has a thru axle. Wheel alignment is a non issue with those. That's the whole point of thru axle.
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Old 06-02-17, 01:56 PM
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Had this problem, found that the mounting area for the brake would allow slipping. I ruffed up the mount area (scuffed the paint) and was able to tighten down the break with no more slipping. Not a problem since.
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Old 06-02-17, 02:10 PM
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Originally Posted by corrado33 View Post
He has a thru axle. Wheel alignment is a non issue with those. That's the whole point of thru axle.
Unless they are self-centering, it might still be an issue. I thought the "whole point" was to keep the axle from popping out.
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Old 06-02-17, 03:39 PM
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Originally Posted by wgscott View Post
Unless they are self-centering, it might still be an issue. I thought the "whole point" was to keep the axle from popping out.
What are you talking about? The wheel cannot be in a different position with a thru axle. That's (one of the) points. It can't be too high on one side or too low on the other. It has to go exactly through the holes and screw into exactly the same mounting point. The wheel cannot "end up" in a different position once the cam is tightened on the outside of the fork. (unless there is a foreign object between the wheel bearing surfaces and the fork surfaces.)

The main point of thru axles was stiffness of forks.

The secondary points were that it makes dealing with discs easier and it makes disc braking safer (disc brake forces QRs out of dropouts.)

Although the chances of the wheel actually popping out with a QR are still very rare unless you're an idiot and don't tighten it.
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Old 06-02-17, 03:50 PM
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Originally Posted by corrado33 View Post
What are you talking about?
http://www.bikeforums.net/19623752-post17.html
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Old 06-05-17, 11:06 AM
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in case someone w/a similar problem reads this thread.

i think i solved my problem, hinted at by jimc101. three rides and all is true.

i must have squeezed the brake levers with the wheel out, or otherwise during transport the pistons/pads moved inward. so i used a flathead screwdriver to push the pads/pistons back in all the way and re-adjusted the calipers. has worked well now.

it also seems to have reduced some mushiness in the brake lever.

lesson learned.
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