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Because this is about your brakes take this to a mechanic as soon as you can!Noisy brakes could be anything from a minor issue to a serious caliper or damaged rotor problem.
When you press the brake pedal does it feel different? Spongy? Harder than normal? Gritty? A pulse as you apply pressure?
I am not familiar with the term flapper. I don't think our toilet cisterns use a flapper.
All the cisterns I have seen work by a syphon action and mostly the only thing that goes wrong with them is the thin polythene disc buried inside the syphon. The disc lays across a hollow piston and the linkage lifts the piston to begin the syphon action and the flush.
There are a few designs of push-button cisterns designed to be more economic on water which I haven't yet seen the inside of but I expect they too will work on a syphon principle - in the absence of a pump how else could it work?
in almost every case of a syphon not working (assuming everything is more or less as it should be) is air getting in somewhere and preventing the mechanism lifting the head of water to begin the syphon.
Loud rumbling noises are often caused by either water boiling in the burner or by entrapped air in the system. To help prevent water boiling make sure that the boiler system has a pressure between 15 - 30 psi. Also check for sufficient water flow and remove any sediment from the in-line filter. To remove entrapped air, install an automatic or manual air vent at the highest point in the heating system and also make sure you have a properly working micro-air vent installed. With the unit turned off and cooled down, you can also try flipping the lever on the pressure relief valve to try and flush out any air in the heat exchanger . Hope this helps.
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