Play in mechanical disc brakes when held tight, normal?
12-12-16, 09:07 PM
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Play in mechanical disc brakes when held tight, normal?
Hi guys, recently I built a bike with TRP Spyre mechanical disc brakes. I feel a little play when holding down the brake lever tightly and rocking the bike forward / back.
It seems the play is coming from the brake pads and not from a loose heatset. Perhaps this is normal behaviour?
I don't see so much play on my Giant Defy Advanced 2 with in house hydraulic brakes however.
It seems the play is coming from the brake pads and not from a loose heatset. Perhaps this is normal behaviour?
I don't see so much play on my Giant Defy Advanced 2 with in house hydraulic brakes however.
12-12-16, 09:16 PM
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Ya, it's not consistent but some Spyres do it and some don't based on what I see in the shop. My personal bike does it too but only in the front. Shouldn't affect anything but it is a little off-putting.
12-12-16, 09:43 PM
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It's normal for pads to jiggle against the retaining pin. This happens with all disc brake systems that use such a setup.
12-12-16, 09:55 PM
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My pads rock a bit.
12-12-16, 10:11 PM
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FWIW, the latest gen 105 road calipers do the same thing. The arm with the quick release rocks back and forth as if the bushing is worn out.
I thought my headset was loose, then I thought it was the brake pad but whole caliper has slop/play.
-Tim-
I thought my headset was loose, then I thought it was the brake pad but whole caliper has slop/play.
-Tim-
12-12-16, 11:18 PM
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Thanks guys, I think this is normal too. It doesn't rock too much, perhaps just less than 5mm of wheel rotation involved. Just wanted a second opinion on this as everything is tightened to the correct torque.
It's a steel fork, different forks can change this behaviour?
It's a steel fork, different forks can change this behaviour?
12-12-16, 11:32 PM
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my TRP Spykes do it too (MTB version of Spyre)
I've heard on another forum, of someone taking shimano xt pads, which are a few mm wider than the TRP ones but use identical retention pattern; and griding them down to be a Perfect fit for the Spykes so no more wiggle.
Related note, kind of an underwhelming brake isn't it? I can do about.... 2 endos, then need to readjust the pads before I can do another
I've heard on another forum, of someone taking shimano xt pads, which are a few mm wider than the TRP ones but use identical retention pattern; and griding them down to be a Perfect fit for the Spykes so no more wiggle.
Related note, kind of an underwhelming brake isn't it? I can do about.... 2 endos, then need to readjust the pads before I can do another
12-13-16, 05:41 AM
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Yep, it is for what you're doing with the brake.
Nope.
Rocking the bike backwards and forwards with the brake applied will cause this to happen because the pads aren't a tight fit in the caliper, this movement you're experiencing is the pad backing plate rubbing against the pistons.
When you ride the bike, the wheel only rotates one way, you won't experience this 'problem' when you ride the bike.
If you stop rocking the bike backwards and forwards with the brake applied and this 'problem' will cease.
Rotors have a arrow on them, it points to the direction that the rotor is supposed to rotate.
Nope.
Rocking the bike backwards and forwards with the brake applied will cause this to happen because the pads aren't a tight fit in the caliper, this movement you're experiencing is the pad backing plate rubbing against the pistons.
When you ride the bike, the wheel only rotates one way, you won't experience this 'problem' when you ride the bike.
If you stop rocking the bike backwards and forwards with the brake applied and this 'problem' will cease.
Rotors have a arrow on them, it points to the direction that the rotor is supposed to rotate.
12-13-16, 07:25 AM
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Shimano caliper brakes are adjustable to remove this kind of wear. The pivot bolt for that arm has a lock nut on the back side. Loosen the locknut and tighten the bolt with a suitable allen key until the play is gone and retighten the lock nut. This is a sensitive adjustment as the difference between no play and binding is very small so it may take a few tries to get it right.
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