Loud thudding noise from front disc brake
I have a set of disc brakes and when I get high speeds usually 20-25mph and I apply the brake, I get a loud thudding noise only in the front brake.
Any ideas on what could be causing this? Note: Rotars are not rubbing on caliper. Thanks for the help! :thumb: |
Is the wheel fully in the dropouts? Is the headset tight? Are the caliper bolts tight? Is it just noise or do you feel something in the lever?
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Originally Posted by B1KE
(Post 17930339)
I have a set of disc brakes and when I get high speeds usually 20-25mph and I apply the brake, I get a loud thudding noise only in the front brake.
Any ideas on what could be causing this? Note: Rotars are not rubbing on caliper. Thanks for the help! :thumb: Singular: Loose headset, loose front wheel, loose front axle/bearings. Repeated: That's the noise disk brakes make when you use them at high speeds. Sounds like purring. |
Another repeating noise could be a rotor with a gauge or burr on it. A singular noise could be the pads moving within the caliper, missing pad spring? Andy.
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Originally Posted by Andrew R Stewart
(Post 17933738)
Another repeating noise could be a rotor with a gauge or burr on it. A singular noise could be the pads moving within the caliper, missing pad spring? Andy.
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Originally Posted by Andrew R Stewart
(Post 17933738)
Another repeating noise could be a rotor with a gauge or burr on it. A singular noise could be the pads moving within the caliper, missing pad spring? Andy.
I was recently greasing the headset, I might of hit the pad spring out when I attached the wheel back, what would I look for once I take the wheel out to know whether the pad spring is in the brake pad? |
Originally Posted by Andrew R Stewart
(Post 17933738)
Another repeating noise could be a rotor with a gauge or burr on it. A singular noise could be the pads moving within the caliper, missing pad spring? Andy.
What's a gauge/burr and how do I go about looking for one/solving it if I do have one? |
Additionally the pad noise is perfectly normal in conditions up to 20mph but passed 20mph it makes the loud thudding noise. Hope this might help in the diagnosis.
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A gauge or burr is a localized deformation of the rotor's surface. A gauge is like a tiny trench. A burr is an edge with a bit of it sticking up. Either could be snagging the pad with each revolution. But from your description I doubt that's what's going on. Some brakes have a sheet metal clip or spring to position or to help retract the pads. It should be easy to find a assembly diagram on line, or just look at the rear brake. Andy.
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One issue I see all too often is noise due to wrong alignment of brake pads to rotor, due to wrong mount added (Ex. change AVID to Shimano) or wrongly set up (washers...). Show us a picture of your affected area.
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Was the onset of the noise sudden? Were the brakes working one day and making noise the next? Does any of your maintenance work on the bike coincide with that time?
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Originally Posted by JonathanGennick
(Post 17938318)
Does any of your maintenance work on the bike coincide with that time?
Originally Posted by B1KE
(Post 17935132)
I was recently greasing the headset
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Originally Posted by cobba
(Post 17938338)
A problem with the headset is one of the first things I thought of.
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I'm pretty certain it's a noise from the headset because it's making a thudding noise at low speeds too. What could be loose and what should I check?
I recently removed the headset to grease the bearings. |
If the headset adjustment was too loose there could be a rocking of the fork within the head tube when the brake is applied. A proper adjustment will allow the fork to rotate freely without binding and also have no slop. By applying the ft brake then rocking the bike fore and aft (when holding the handle bars) a loose adjustment will be felt as a knock as the fore then aft force is applied. As the headset adjustment is bit by bit tightened up the rocking/knock will decrease and just go away as the best bearing preload is attained.
It's hard to tell a too tight adjustment from a good one if the bearings are in good condition. But a too tight adjustment will hasten the bearing's demise by a lot. This is why when teaching how to do a headset adjustment I always tell the student to start with a too loose one. This slop can be felt easily. Too tight isn't. When riders come into the shop with a problem, a noise or feel a knock sometimes they don't understand why a complete tune up is what we often start the process with. After all the problem is from one source... But this thread has shown that a simple problem can have a number of sources. A general base lining of the bike's adjustments and condition can often find/fix the problem. It can also allow the time and exploration by a skilled wrench to discover other issues that might not have yet been noticed by the rider. I do wonder if during the headset servicing if the OP got the reassembly correct. If a bearing is placed upside down all adjustment attempts are for naught. Andy. |
Originally Posted by JonathanGennick
(Post 17938318)
Was the onset of the noise sudden? Were the brakes working one day and making noise the next? Does any of your maintenance work on the bike coincide with that time?
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Originally Posted by Andrew R Stewart
(Post 17943665)
If the headset adjustment was too loose there could be a rocking of the fork within the head tube when the brake is applied. A proper adjustment will allow the fork to rotate freely without binding and also have no slop. By applying the ft brake then rocking the bike fore and aft (when holding the handle bars) a loose adjustment will be felt as a knock as the fore then aft force is applied. As the headset adjustment is bit by bit tightened up the rocking/knock will decrease and just go away as the best bearing preload is attained.
It's hard to tell a too tight adjustment from a good one if the bearings are in good condition. But a too tight adjustment will hasten the bearing's demise by a lot. This is why when teaching how to do a headset adjustment I always tell the student to start with a too loose one. This slop can be felt easily. Too tight isn't. When riders come into the shop with a problem, a noise or feel a knock sometimes they don't understand why a complete tune up is what we often start the process with. After all the problem is from one source... But this thread has shown that a simple problem can have a number of sources. A general base lining of the bike's adjustments and condition can often find/fix the problem. It can also allow the time and exploration by a skilled wrench to discover other issues that might not have yet been noticed by the rider. I do wonder if during the headset servicing if the OP got the reassembly correct. If a bearing is placed upside down all adjustment attempts are for naught. Andy. I don't get any play in the headset when I apply the front brake and push it fore and aft, but under sudden stops and harder breaking I do feel a loud thudding noise from the disc brake and feel like the bearings in the headset are making a noise internally. Is it possible for the entire headset to fit, even if I put the bearings on backwards? |
Originally Posted by Andrew R Stewart
(Post 17935536)
A gauge or burr...
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Originally Posted by asmac
(Post 17949106)
Would I be right to think that you and the other poster actually mean "gouge"?
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