tomprescott
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| posted on 30/3/10 at 08:18 PM |
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How vital are brake disc back plates?
As title really, I have some knackered backing plates on my rear discs, there are some being sold on ebay at circa £30 posted, but the seller
hasn't specified if thats per plate or for both (and also isn't replying to my emails).
What are your opinions? I'm super skint (as always) so if its not necessary then I'm happy to leave them off, alternatively if they are
needed I'll need to shop around, because I'm not prepared to spend over £60 for a pair.
Ta in advance.
A bird in the hand....
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blakep82
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| posted on 30/3/10 at 08:23 PM |
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i'm with better on but not a problem if left off.
stops stones and things getting in, but also help trap stuff
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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owelly
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| posted on 30/3/10 at 08:28 PM |
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I've voted to fit them to a hedgeback and don't worry about them. It makes your discs easier to inspect, lessens the chance of getting a
squealy pebble in there and you can spend the cash you've saved on cakes.
http://www.ppcmag.co.uk
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tomprescott
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| posted on 30/3/10 at 08:29 PM |
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Cool, that's what I was hoping for. Maybe a potential upgrade at a later date if I encounter problems. Thanks
A bird in the hand....
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tomprescott
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| posted on 30/3/10 at 08:31 PM |
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quote:
Originally posted by owelly
I've voted to fit them to a hedgeback and don't worry about them. It makes your discs easier to inspect, lessens the chance of getting a
squealy pebble in there and you can spend the cash you've saved on cakes.
Mmmm, cake Damnation to you, I have no cake in the house and I'm too idle to go and get some but now I feel the need 
A bird in the hand....
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adithorp
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| posted on 30/3/10 at 08:33 PM |
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They're not fitted on a lot of tin-tops these days. Leave them off.
adrian
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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tomprescott
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| posted on 30/3/10 at 08:42 PM |
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Brilliant, money and weight saving. I love this place! Cheers everyone!
A bird in the hand....
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mcerd1
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| posted on 30/3/10 at 09:04 PM |
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I think I remember seeing vented ones for cossie rally cars (to help cooling but stop the gravel getting in there)
and the old landrovers have them on the fronts (drums on the rear)
but both of those vehicles are designed to deal with mud/gravel.......
-
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Dusty
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| posted on 30/3/10 at 09:23 PM |
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If they were that vital they would have back plates and front plates, or do stones only try to sneak up on discs from one side?
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blakep82
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| posted on 30/3/10 at 09:45 PM |
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quote:
Originally posted by Dusty
If they were that vital they would have back plates and front plates, or do stones only try to sneak up on discs from one side?
well, the wheel generally does the job of the front plate i think  steels more than alloys
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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hillbillyracer
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| posted on 30/3/10 at 11:18 PM |
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Plenty stuff has them front & rear, so long as it's just a tin shield & doesnt hold anything of importance i would'nt worry.
If it's got a drum type handbrake built into the disc then the backplate may be there to hold the shoes & I'd make sure that bit is
sound.
And yes, think cakes!
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britishtrident
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| posted on 31/3/10 at 08:23 AM |
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The reason they are fitted is to stop road spray getting on to the disc in wet conditions.
The story goes spray shields were first employed by Girling in conjunction with Rootes engineers in the late 1950s.
Durring the development of the Hillman Minx based Sunbeam Alpine. Rootes had tried brake calipers from both Lockheed and Girling but had run up
against an excessive pad wear problem. They found that during wet weather testing pad wear was occurring at about 4 times the rate of wear in the
dry, when spray shields were fitted the problem disapeared. As a result Girling were awarded the contract for the braking system on the Alpine,
although Lockheed got the contract for the other models in the range.
A second advantage that later became apparent that only occurs during long motorway journeys in very wet conditions where it can many miles between
applications of the brakes. In these conditions a thin film of oily traffic film can build up on the surface of the disc which takes a heart
stopping split second for the brake pad to bight through and grip the disc.
On modern cars with wide wheels which have a lot of negative offset the brake disc is much better shielded from road spray by the wheel itself so the
spray shields are now omitted from many models.
[Edited on 31/3/10 by britishtrident]
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tomprescott
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| posted on 31/3/10 at 10:43 AM |
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Brill, thanks everyone.
A bird in the hand....
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Daddylonglegs
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| posted on 31/3/10 at 11:37 AM |
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quote:
Originally posted by britishtrident
The reason they are fitted is to stop road spray getting on to the disc in wet conditions.
The story goes spray shields were first employed by Girling in conjunction with Rootes engineers in the late 1950s.
Durring the development of the Hillman Minx based Sunbeam Alpine. Rootes had tried brake calipers from both Lockheed and Girling but had run up
against an excessive pad wear problem. They found that during wet weather testing pad wear was occurring at about 4 times the rate of wear in the
dry, when spray shields were fitted the problem disapeared. As a result Girling were awarded the contract for the braking system on the Alpine,
although Lockheed got the contract for the other models in the range.
A second advantage that later became apparent that only occurs during long motorway journeys in very wet conditions where it can many miles between
applications of the brakes. In these conditions a thin film of oily traffic film can build up on the surface of the disc which takes a heart
stopping split second for the brake pad to bight through and grip the disc.
On modern cars with wide wheels which have a lot of negative offset the brake disc is much better shielded from road spray by the wheel itself so the
spray shields are now omitted from many models.
[Edited on 31/3/10 by britishtrident]
Now THAT is what I call an answer 
It looks like the Midget is winning at the moment......
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Bluemoon
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| posted on 31/3/10 at 12:22 PM |
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quote:
Originally posted by Daddylonglegs
quote:
Originally posted by britishtrident
The reason they are fitted is to stop road spray getting on to the disc in wet conditions.
The story goes spray shields were first employed by Girling in conjunction with Rootes engineers in the late 1950s.
Durring the development of the Hillman Minx based Sunbeam Alpine. Rootes had tried brake calipers from both Lockheed and Girling but had run up
against an excessive pad wear problem. They found that during wet weather testing pad wear was occurring at about 4 times the rate of wear in the
dry, when spray shields were fitted the problem disapeared. As a result Girling were awarded the contract for the braking system on the Alpine,
although Lockheed got the contract for the other models in the range.
A second advantage that later became apparent that only occurs during long motorway journeys in very wet conditions where it can many miles between
applications of the brakes. In these conditions a thin film of oily traffic film can build up on the surface of the disc which takes a heart
stopping split second for the brake pad to bight through and grip the disc.
On modern cars with wide wheels which have a lot of negative offset the brake disc is much better shielded from road spray by the wheel itself so the
spray shields are now omitted from many models.
[Edited on 31/3/10 by britishtrident]
Now THAT is what I call an answer
yep, also indicates you might want them! At least you know what they do now, there is normally a reason why the manufacture uses something otherwise
they would save cash and not fit!
Dan
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