Noise after fitting new brakes...

[jon h]

I took the Cerb for a quick bedding in run today after doing some work. This included new disks and pads (green stuff) all round. I now get a noise, from the rear near side, I think. It is a sort of clunking rattle, clearly speed related, which goes as soon as I touch the brakes, then comes back when I release them. I am thinking that this could be the rear pads rattling in the callipers. Any thoughts, before I take it all to bits again? I seem to recall the suggestion on here somewhere, possibly by Trackcar, that one can bond the pads to the pistons using silicone or liquid gasket. The old pads I took out (mintex) had a thin foam pad on the back, which the green stuff ones do not have. Perhaps this is a contributory factor?

Thanks in advance

Jon H

[BossCerbera]

I think you're looking in the right place. Sounds like the brake pad isn't returning as far as the piston does. Either the pad is fouling on something or the thin foam pad is needed (or the silicone idea) to take up this 'slack'.

[GreenV8S]

Sanity check that the calipers are securely bolted on, and if it had anti-rattle springs check these are correctly fitted.

[trackcar]

You've got it exactly Jon. Just use std silicone sealer from B+Q or similar .. will do the trick no problem, just a thin smear over the rear of the pad, refit and then stamp on brake pedal amd leave to set. Job done

[jon h]

Thanks Guys. To be honest, the springs were a bit past their best, so I will probably put new ones in, and go in with a dab of silicone too, as a belt and braces approach.

Jon H

[ridds]

Yep rattly pads. Had this before.

[schimg]

jon h said:

I took the Cerb for a quick bedding in run today after doing some work. This included new disks and pads (green stuff) all round. I now get a noise, from the rear near side, I think. It is a sort of clunking rattle, clearly speed related, which goes as soon as I touch the brakes, then comes back when I release them. I am thinking that this could be the rear pads rattling in the callipers. Any thoughts, before I take it all to bits again? I seem to recall the suggestion on here somewhere, possibly by Trackcar, that one can bond the pads to the pistons using silicone or liquid gasket. The old pads I took out (mintex) had a thin foam pad on the back, which the green stuff ones do not have. Perhaps this is a contributory factor? Thanks in advance Jon H

Jon,

I think that the only resolution is to take the body off, works every time...i think!



Looks like this will be resolved without such drastic action though!

[Luckyone]

jon h said:

Thanks Guys. To be honest, the springs were a bit past their best, so I will probably put new ones in, and go in with a dab of silicone too, as a belt and braces approach. Jon H

Be sparing with it though, I did it as Trackcar told me to & it got in to the callipers pistons & the pads stayed in permanent contact with the discs - they didn't last long!

I now use double sided carpet tape as recommended by Andy at APM much safer...

[trackcar]

Bloody hell how much did you use?

You can get proper *pad glue* specifically for the purpose by the way, but it's far more expensive than ordinary silicone. Carpet tape sounds a good idea.. any idea what heat it can withstand? .. pads can get very hot and you wouldn't want molten glue coming between the pad and the discs under an emergency stop situation.

[jon h]

Hmm.. I have a fairly technical double sided tape in the garage with a 120 degrees c. adhesive. I am not sure how hot the back of the pads would get (don't tend to do track work) but I am guessing it would out perform carpet tape. I may give it a try.

No plans to have the body off just yet, Steve. I only meant to clean up the chassis on this project, and have ended up with new disks, pads, drop links and Act water pipes. God knows what I would end up replacing if I had the whole body off!

Jon H

[luckyone]

trackcar said:

Bloody hell how much did you use? You can get proper *pad glue* specifically for the purpose by the way, but it's far more expensive than ordinary silicone. Carpet tape sounds a good idea.. any idea what heat it can withstand? .. pads can get very hot and you wouldn't want molten glue coming between the pad and the discs under an emergency stop situation.

What I thought was a small amount there was no obvious excess anywhere, strange I know you use it a lot.

The tape stood up to some very excessive abuse at the monster day, an open pit & two not very good drivers = a lot of very heavy brake use especially for the rears as I’ve made some cooling ducts for the fronts.

I wanted to say hi to you there Joolz & tell you how great your larger AP discs were, but couldn’t drag my self away from the open race track

[DeathRace2005]

trackcar said:

Bloody hell how much did you use? Carpet tape sounds a good idea.. any idea what heat it can withstand? .. pads can get very hot ......

Actually, I was a little worried that B&Q silicone would melt ! I saw the development of the Elise TV series and they were talking in hundreds of degrees !

Is CopperSlip no good for this type of application ?

Just wondering !?

[Luckyone]

DeathRace2005 said:

trackcar said: Bloody hell how much did you use? Carpet tape sounds a good idea.. any idea what heat it can withstand? .. pads can get very hot ...... Actually, I was a little worried that B&Q silicone would melt ! I saw the development of the Elise TV series and they were talking in hundreds of degrees ! Is CopperSlip no good for this type of application ? Just wondering !?

No, the idea is to stick the pads to the calipers pistons to stop them catching on the discs & bumping up & down. Joolz has done it on a lot of cars & had no probs as far as I know. Just I had the problem above.

[schimg]

jon h said:

Hmm.. I have a fairly technical double sided tape in the garage with a 120 degrees c. adhesive. I am not sure how hot the back of the pads would get (don't tend to do track work) but I am guessing it would out perform carpet tape. I may give it a try. No plans to have the body off just yet, Steve. I only meant to clean up the chassis on this project, and have ended up with new disks, pads, drop links and Act water pipes. God knows what I would end up replacing if I had the whole body off! Jon H

Jon, I could give you some idea of the "Shopping List!" you'd end with, at least you are doing ot yourself and saving a packet, and gaining a working knowledge of the cerbie. If you need a hand give me a shout no problem, good luck with it, probably hook up over x'mas Rugger Tavern....lynn and Richard perhaps?

Give you opportunity to have a gander at the rebuild...

Steve