When appling brakes it starts viribrating some times

Knocking noise driving me mad!!! - Clubjazz

clubjazz.org/forum/index.php?topic=2287.0;wap2
Honda Jazz, HR-V & Hybrid Forums > Honda Jazz Mk1 2002-2008 ... Has any one experienced a knocking noise from the front end? ... So after a breather and a few more cuppa's I decided to go back over everything that I had had done.

try jacking it up SAFELY and you may have to put it in netural and turn each wheel one at a time and appling the brakes to find what wheel is causing the problem and where its coming from, if you did all this work you should have a good idea of where it could be coming from.

Replace front brake rotors ! inspect rear for un even wear

have you checked pad wear recently also brake fluid level

Did they replace the spring hardware too ?

dry sliders maby cheep or cracked pads

You say you have been to a mechanic and I assume there is nothing mechanically wrong with the brakes so I will not address the numerous possible mechanical causes. But here are a few other suggestions:
Brake sqeal can be cause by high huminty and cold weather and, as you describe, usually goes away after the brakes have been appled a few times and "warmed up" So you can "ride the break" for a few moments when first starting as one easy solution to try.
Accumulated brake dust can also cause brake squeal. Usually this is only in the front wheels as they have the heaviest wear. Try washing by spraying front wheels with highs pressure stream form your garden hose. Do not use compressed air for this task as the dust is unhealthy to breath. Also your local auto part store will sell a spray liquid for this such as:Permatex Brand Disk Brake Quiet 12 oz spray can about $8.00 or CRC 05080 De-Squeak Conditioning Treatment for Brakes. Both can be purchased online also.
Finanlly, if none of these solutions work, and this really bother you and you are willing to spend the money, find a mechanic who is "old school" and know how to fix this problem. There are shims, dampener, lube points, pad shaping and rotor de-glazing that can be tried.
J

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Sounds like a sticky caliper piston. Possibly the slide bolts are dry and need to be greased. These are the long shafts that hold the two pieces of the caliper together.

This is normal, with both wheels off the ground the wheel with the least resistance will spin. Appling the brakes can change this.

Special tool can be bought OR.... With a pair of adjustible pliars grip the piston (DO NOT DAMAGE THE RUBBER BOOT) by the tip and screw clockwise while appling pressure with c-clamp Screw then press, screw then press untill all the way in. Set park brake several times to reset brakes after repair is complete.