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  1. #1
    Pete20vt's Avatar
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    Rattle Under Car...

    I don't think for one minute any of you will be able to diagnose my rattle but its really annoying me! I have a very tinny light rattle that seem to come from under the car on the passenger side at the rear, happens when i'm going over bumps or decelerating, so dosnt seem engine/brake/drivetrain related, seems to light a noise to be suspension related too. Had a poke around under there put can't find anything thats loose or makes a noise, i grabbed and shook everything i could see, suspension, exhaust, heat shields etc. Anyone have any ideas?
    FOR SALE: 2003 RED Audi S3 - 73k - MINT - Custom-Code - Black Leather - £6600

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  3. #2
    A3Tom's Avatar
    Smell my finger.

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    My money would have been on the bottom heat shield on the cat...mine got removed not so long ago as it was making a right racket.
    2000 Audi A3 1.8T Sport - Custom Code Phase 1 remap / Custom Stainless Catback Exhuast / MKII 18" RS4 Reps / Wietec Ultra GT40mm / KW ARB's / Forge TIP / Forge 007 / Green Panel Filter / EBC Greenstuff pads / 312mm S3 front brake upgrade / Aero Wipers / LED Interior Lights / LED Side Repeaters / Face Lift Rear Lights and covered in Dodo Juice

  4. #3
    Pete20vt's Avatar
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    Well i'll get back under there tomorrow and double check everything.
    FOR SALE: 2003 RED Audi S3 - 73k - MINT - Custom-Code - Black Leather - £6600

  5. #4
    A3Tom's Avatar
    Smell my finger.

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    Mine used to drive me round the bend...grrr. even remembering it gets my beef

    They're welded on from memory and as the exhaust ages they welds start to fail. They dont do anything other than stop grass setting on fire when you drive over it so they're pretty pointless IMO.
    2000 Audi A3 1.8T Sport - Custom Code Phase 1 remap / Custom Stainless Catback Exhuast / MKII 18" RS4 Reps / Wietec Ultra GT40mm / KW ARB's / Forge TIP / Forge 007 / Green Panel Filter / EBC Greenstuff pads / 312mm S3 front brake upgrade / Aero Wipers / LED Interior Lights / LED Side Repeaters / Face Lift Rear Lights and covered in Dodo Juice

  6. #5
    Pete20vt's Avatar
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    Quote Originally Posted by A3Tom View Post
    Mine used to drive me round the bend...grrr. even remembering it gets my beef
    lol Will pay a bit more attention to the heat shields tomorrow, that said though i've had a noisey heat shield before on another car which sounded different to todays noise, at the minute its sounds as if something is just plain loose and about to fall off.
    FOR SALE: 2003 RED Audi S3 - 73k - MINT - Custom-Code - Black Leather - £6600

  7. #6
    Lemon S3's Avatar
    Alex

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    I had a rattle under idle which was the cat shield as a couple bolts had come off, just re bolted n now can idle in peace
    1999 APY S3 Imola Yellow

    PS3: Broady_11

  8. #7
    funnyclub's Avatar
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    I have this rattle on moving off from a stand still. I taught myself it was the cat shield so it will be getting sorted or getting binned

  9. #8
    Pete20vt's Avatar
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    I took the heat shield off (with an angle grinder) and i still have the rattle. Went over the whole underneath of the car with a rubber mallet and can;t find anything loose! I might take the CAT off and give it a shake to see if its the CAT itself.
    FOR SALE: 2003 RED Audi S3 - 73k - MINT - Custom-Code - Black Leather - £6600

  10. #9
    Pete20vt's Avatar
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    I'm 99% sure its the rear brake caliper! Reasons are as follows...

    • Rattle is defo around the passenger rear wheel
    • No rattle when i beat the exhaust system with a rubber mallet
    • No rattle while beating anything under the car
    • Heat shields have been removed
    • No rattle when i wobble the car by jumping up and down on the door sill, which leads me to believe its something on the hub/suspension arm/wheel
    • No rattle while braking
    Before i take it apart tomorrow and to save me the time of taking the oppostite side apart too for comparison, is there anything obvious i should be looking out for visually, maybe i've lost a spring or something?
    FOR SALE: 2003 RED Audi S3 - 73k - MINT - Custom-Code - Black Leather - £6600

  11. #10
    landopanda's Avatar
    1st Gear

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    I had my rear brakes rattle, it was a very metallic sound. Occurred when going over bumps, but if you were braking wouldn't rattle. Basically it was the pad a bit loose in the calliper, a bit of copper grease around the pad and its never done it since, 1yr.
    2001 AMK ...Black

  12. #11
    voorhees's Avatar
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    Quote Originally Posted by Pete20vt View Post
    I'm 99% sure its the rear brake caliper! Reasons are as follows...
    maybe i've lost a spring or something?
    maybe you have answered the question,it sure does sound like that

  13. #12
    Broken Byzan's Avatar
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    Change the pads, wind the piston back, job done. Common failing in my experience. I have decent front pads fitted (ds 2500) and they rattle/clunking on touching the brakes

 

 

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