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Old 15 March 2012, 18:22   #11
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Oh yeah, sorry - you're pretty much bang on with the dims. 200x50 means a 200mm inside drum diameter and a 50mm width shoe.

TBH a lot of trailer manufacturers are a nightmare for using all sorts of different running gear and braking components (Snipe used to be terrible for it, but I think they're fairly consistent nowadays, even Indespension who've used Knott running gear in their own axles for decades, have now moved over to Alko), but it looks like you've got GKN brakes inside GKN drums - a wonder for small blessings!
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Old 16 March 2012, 18:29   #12
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Thanks a lot for those links mate, they're exactly what I'm after. Not exactly the most intuitive website is it? Especially when random parts of it are in French!

That trailer looks identical to what I've got and the breakdown of the braking system is definitely what's installed on my trailer.

So maybe a silly question, but if the dimensions were exactly the same (will take precise ones tomorrow), could one use some Knott hubs/drums and shoe kits on this GKN axle or would they not be compatible??

Thanks for the bearing packing link, is there no way of topping up the grease in the bearings after they've been dunked in sea water without taking the whole lot apart?

Thanks.
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Old 18 March 2012, 16:03   #13
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The drums are exactly 200mm internal diameter and the shoes are 50mm wide.

Would Al-ko or Knott shoes be compatible with these backplates and drums?

Cheers.
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Old 18 March 2012, 22:27   #14
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Originally Posted by Jonny2488 View Post
Thanks for the bearing packing link, is there no way of topping up the grease in the bearings after they've been dunked in sea water without taking the whole lot apart?
You may be able to find (or build) a dust cap with a zerk fitting in it that allows you to get grease in without disassembly. Have to be careful about blowing out the grease seal though.

jky
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Old 22 March 2012, 09:48   #15
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You may be able to find (or build) a dust cap with a zerk fitting in it that allows you to get grease in without disassembly. Have to be careful about blowing out the grease seal though.
Good idea mate, cheers.

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Originally Posted by Trailer Guy View Post
Oh yeah, sorry - you're pretty much bang on with the dims. 200x50 means a 200mm inside drum diameter and a 50mm width shoe.

TBH a lot of trailer manufacturers are a nightmare for using all sorts of different running gear and braking components (Snipe used to be terrible for it, but I think they're fairly consistent nowadays, even Indespension who've used Knott running gear in their own axles for decades, have now moved over to Alko), but it looks like you've got GKN brakes inside GKN drums - a wonder for small blessings!
Any more thoughts anyone on using brake shoes and drums of a different manufacturer to those that were originally fitted? I'm relatively sure it'll all fit the same, it's just the fittings for the brakes onto the backplate that I'm not sure will be the same. Any thoughts?

Thanks.
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Old 24 March 2012, 05:29   #16
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Hi Jonny

Apologies for the tardiness of my reply, I've been run off my feet. As soon as the weather turns for the better, you can bet your bottom dollar I'll be out from sun up to sun down!

There's a possibility the knott brakes may fit, though there are differences. Obviously, the way they're retained to the backplate differs, the expander is similar, but not identical, and I'm unsure about the sizes of the adjusters. Also, the way the shoe is housed in the adjusters is different - a converse end, rather than a convex.

Is there a reason for looking at converting? Is it the availability of parts? If so, before you go to the possible grief of changing, did you manage to contact Dave, on those details I gave you? If he's a dealer for Satellite then there's a good chance he'll be able to suply the braking components.

As an aside, here's a few pics of Knott and GKN brake parts, so you can see what I mean about the differences:

Knott 200x50







GKN 200x50






All the best, Ben
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Old 25 March 2012, 16:30   #17
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Hi Ben,

Thanks for your reply mate, good that you've been busy and hope that is revenue related I have tried emailing Dave on a couple of addresses but both times they've been rejected and sent back to me, which I fear is bad news. I'm going to try the phone number he's got down tomorrow and see what result I get.

Yes the reason for potentially changing is the current lack of availability of spare parts. I'm hoping Dave will be a dealer and be able to supply the parts, but if not, will have to come up with a plan b.

Thanks a lot for that explanation and photos of the differences, makes it much easier to understand the possible problems.

Thanks again for your help.
Jonny.
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Old 26 March 2012, 16:40   #18
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Originally Posted by Trailer Guy View Post
Is there a reason for looking at converting? Is it the availability of parts? If so, before you go to the possible grief of changing, did you manage to contact Dave, on those details I gave you? If he's a dealer for Satellite then there's a good chance he'll be able to suply the braking components.
Good news Ben!!....I managed to get hold of Dave today. He is indeed a Satellite dealer and can get hold of parts for me! Hooray! Step 1 complete.

I'm waiting on accurate prices, but initially he said about 160 for a pair of brake shoes (1 axle's worth), thought that was a bit steep or is that pretty standard??

Also, do you think these bearings (photo attached) will be specific or generic ones? Dave said they're about 40 a pair, but if they're just the generic ones, I've seen them considerably cheaper than that!

Thanks,
Jonny.
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Old 27 March 2012, 05:34   #19
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I have just paid 260 + vat for a new axle for my trailer as the rebuild was going to cost not far off this & I wanted to change to tapered roller bearing, may be worth costing up just replacing the axles?
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Old 27 March 2012, 05:40   #20
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Hi jonny

That does sound comparatively expensive (Knott 200x50 are around 50 rrp), however I know Dave of old and he's not one in to ripping people off, so it could be the fact they're a PITA to get hold of, or the fact that he needs to get them in from France - shipping, taxes etc... (EU one big happy economic family my arse...)

Anyway, it'd be worth asking him about it, use the fact that it's a twin axle and say you'd like a deal on two sets and make sure it includes the new springs too - your old ones will be shot.

Bearings will likely be fairly generic. Knock them out and let me know the numbers (both on the cone and cup) and the numbers on the seal. I'll be able to point you in the right direction.

All the best, Ben

(or do as Nick did! - happy to price that up for you too)
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