Resolve brake squeal?

[crankedup]

Having tried most things I am advised that I should try to dampen the vibration which causes the screeching. To do this I need to surround the external perimeter of the brake drums with some thick or dense rubber and secure this with???????????????? My brake drum has an measurement of 44 inches round and I need an clip/clamp of some description that I can tighten very firmly onto the rubber and so dampen that vibration. An enormous Jubilee clip would be ideal of course but I don't imagine they are made in such an size. Any ideas please as to what I can use. Thanks.

[guru_1071]

crank

ive seen vintage cars with long coil springs (about 1/2" across) that go right the way round the drum - this is meant to cancel out the harmoniocs that cause the squeal.

ive seen cars with four or five on each drum so it must work i guess?

[youngnick]

A temporary solution might be to use two or three cable ties joined in tandem?

Alan

[mph]

You could try a Band-it clip or similar product. They can be made into any size and are much stronger than a conventional hose clamp. Available in stainless steel too.

http://www.hosexpress.com/bandit/bandit.htm

[RW774]

Find the route cause of the squeal first. I would say the linings have no leading edge and are the material is far too hard. secondly, the drums are oval.No amount of rubber or spring nonsense will resolve the problem .
You should look to flow as much cool air in and out of the drum assembly to keep the drums cool, otherwise they will distort again.

[crankedup]

Many thanks for all the tips and comments.
Both rear brake drums are very slightly oval and are of steel construction, fitted with new brake linings by previous owner. So I am wondering if its worthwhile having those linings removed and fitting softer material as suggested.

Edited by crankedup on Monday 12th July 10:24

[RW774]

Definetly.........

[crankedup]

[lowdrag]

Of course, you cvould also do what we caught one person doing on our 2001 Tour de France with the E-types. To cure the squeal from the rear brakes we found him greasing the discs

[guru_1071]

lowdrag said:

Of course, you cvould also do what we caught one person doing on our 2001 Tour de France with the E-types. To cure the squeal from the rear brakes we found him greasing the discs

i bet it stopped the squeal though!..........

[crankedup]

Blimey! he was thinking outside of the box!!

[RW774]

lucky he didn`t finish up in one.

[TallPaul]

Have you tried taking the shoes out and filing a chamfer onto their leading edges? The squeel is (usually) caused by a cushion of air getting between the shoes and the drum (or pads and disc), making the shoes oscillate. With pads you can apply copper grease to dampen/alter the frequency of the vibration until it is inaudible, with shoes you need to lessen the air cushion. chamfer the shoes and maybe get the drums skimmed.

[crankedup]

Thanks for tips Tallpaul.

[RW774]

TallPaul said:

Have you tried taking the shoes out and filing a chamfer onto their leading edges? The squeel is (usually) caused by a cushion of air getting between the shoes and the drum (or pads and disc), making the shoes oscillate. With pads you can apply copper grease to dampen/alter the frequency of the vibration until it is inaudible, with shoes you need to lessen the air cushion. chamfer the shoes and maybe get the drums skimmed.

The cushion described is the gas created and given off by the brake material when hot, hence the use of grooved discs and drilled drums.