Hi All 

 

just looking to see if anybody else has had this issue. Been getting a rattling noise over bumps pot holes etc .had my suspension checked all good can solid. This has been going on a while. Today I had the car back on the ramps and I noticed I was able to shake/ move the drivers side outer brake pad. These were changed last summer and the brakes with fine. No pulling about under heavy braking all working good .press the pedal and the pads go solid release and it’s lose enough to rattle. ? These are Brembo pads 

 

any thoughts please 

 

Jim 

Disc back plate?

No mate 

I can physically move / wiggle the outside pad.  
press the brake it’s solid .release it I can wiggle it again ??

Edited January 20Jan 20 by Jim Ridley

Well you have a sticking caliper or slide pins then. 
Well worth checking the brake shield while you are there. 

Sounds like you need a brake dismantle and rebuild.

Depends on the caliper set up, but in my experience, there’s usually a stainless steel shim that the pad shoulders sit in the carrier. Usually a smear of ceramic anti-seize on the backs or contact edges.

Brembo means nothing I’m afraid in terms of quality these days, it depends where the pads were manufactured, and overall quality. Personally I like Zimmermann and TexTar products. I think the car would probably have come with ATE pads. If they’re loose in the carrier, then something isn’t right.

I’ve also seen issues with loose pads from corroded brake carriers, seized brake sliders, etc.

10 hours ago, Magnet said:

Well you have a sticking caliper or slide pins then. 
Well worth checking the brake shield while you are there. 

thank you mate 
The calliper does not seem to be sticking .brake off the wheel turns freely brake on it solid release it’s totally free. The C8 doesn’t have slider pins on the front calliper

 

 

 

5 hours ago, spartacus 68 said:

Sounds like you need a brake dismantle and rebuild.

Depends on the caliper set up, but in my experience, there’s usually a stainless steel shim that the pad shoulders sit in the carrier. Usually a smear of ceramic anti-seize on the backs or contact edges.

Brembo means nothing I’m afraid in terms of quality these days, it depends where the pads were manufactured, and overall quality. Personally I like Zimmermann and TexTar products. I think the car would probably have come with ATE pads. If they’re loose in the carrier, then something isn’t right.

I’ve also seen issues with loose pads from corroded brake carriers, seized brake sliders, etc.

The shim is in place .its an odd one .no slider pins in these callipers and both pistons working as they should
 

thank you anyway 

 

Jim 

8 hours ago, Jim Ridley said:

The shim is in place .its an odd one .no slider pins in these callipers and both pistons working as they should
 

thank you anyway 

 

Jim 

Pads usually come with new shims. The shims have flexibility to bend slightly, and again in my experience are usually a tight fit, and even worse if there's corrosion on the pad carrier. There's always the chance pads were wrong in terms of part number right from the get-go, unless you have paperwork and you can cross check?

All comments are being focused on the brake caliper shim being the source of the noise.
Are you positive that element of the system is the true offender in this, rather than the noise being emitted from elsewhere? 

8 hours ago, Magnet said:

All comments are being focused on the brake caliper shim being the source of the noise.
Are you positive that element of the system is the true offender in this, rather than the noise being emitted from elsewhere? 

its the only thing I can find that is lose  , we have a Mot shaker deck at work and the car has been on it three times ,the last time a good 15 mins with the mechanic checked all the suspension parts etc and they are all solid  ,all the under skits and trims are solid  ,the sound I can hear is a metallic clinking when going over bumps in the road  ,I have also heard a noise from the wheel area while driving that stops once I braked , dont get any noise under breaking and the car stays true under very heavy braking   the rattlerly  pad is the only thing I can find lose ??

Perhaps I’ve missed this when it was mentioned earlier, but ‘….metallic clinking when going over bumps…..’. 

Repeating, you are focussing on the brake pad shim as being the culprit here, so logical way forward to prove/refute it being the offender, would be to temporarily insert another piece of shim-like material of appropriate thickness to stop the ‘offending’ shim rattling. 

Metallic clinking would suggest a rotational association, and again repeating, I would be thoroughly inspecting the brake disc back plates - a known sufferer of corrosion and breaking up. 

Definitely the brake pad .slight pressure on the bake over a bump and there is no noise. .car went through MOT yesterday no issues.  Will try your suggestion at the weekend. Thank you mate 

6 hours ago, Jim Ridley said:

Definitely the brake pad .slight pressure on the bake over a bump and there is no noise. .car went through MOT yesterday no issues.  Will try your suggestion at the weekend. Thank you mate 

Hi Jim been studying this one as it developed, what we have here is a classic case of brake pad chatter so rather than buy new pad carriers try this, you can buy on line 3M anti squeal backing, this sticks to the back of the pad and if you thoroughly clean and degrease the contact surfaces of the calliper and the pistons once the brakes are hot the backing semi welds itself to the contact surface, this stops the pads from moving on the contact surface therefore reducing the chatter and any squealing and at around £14 on eBay its definitely worth punt, done over a million miles in various cabs I have owned the worst offenders being Mondeos, and believe me this stuff works, don't quite get the lack of slider pins so if you could indulge me with a picture I can probably workout out.

Steve.

Thank you Steve. I will look this up 

 

Cheers

 

jim 

14 hours ago, Jim Ridley said:

Thank you Steve. I will look this up 

 

Cheers

 

jim 

Hi just twigged it you have fixed callipers, probably twin pot have not seen these on a production car for a long while, also can't figure out why they have gone over to this system as the callipers weigh more and are expensive to produce compared with floating callipers which are lighter and a lot less expensive to produce and refurbish, fixed units are more common on high performance cars Ferrari and track cars, therefore the pad backing should eliminate the chatter.

STEVE.