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Austinsevenfriends
Wanted: Ruby Brake Component BK76 or Suggestions for Repairing It - Printable Version

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+--- Thread: Wanted: Ruby Brake Component BK76 or Suggestions for Repairing It (/showthread.php?tid=10017)

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Wanted: Ruby Brake Component BK76 or Suggestions for Repairing It - Jamie - 27-05-2025

Does anyone have a spare part BK76 for a Mk1 Ruby that they would be willing to sell? 


.png   Screenshot 2025-05-25 094224.png (Size: 76.31 KB / Downloads: 461)

In trying to remove the final amount of wear in the trunnion hole, I managed to ruin the thing altogether by over heating it and melting the thin edge, away from the main body. I imagine that it could be built up with weld and reshaped, but I am not sure how strong that would be. I also wondered whether the two "holes" could be cut off altogether and new steel pieces welded on instead.

I would welcome either a replacement part if one is available for sale or suggestions for repairing it.

Cross-with-himself,

Jamie.

(Moral: do not try this sort of thing when you are tired.)

RE: Wanted: Ruby Brake Component BK76 or Suggestions for Repairing It - Chris KC - 27-05-2025

Sorry to hear that Jamie. Have you tried Tony Leslie (Holmesdale Sevens)? I should have thought he could find you one.
https://oldcarservices.co.uk/austin-seven-specialists/

RE: Wanted: Ruby Brake Component BK76 or Suggestions for Repairing It - Jamie - 27-05-2025

Thank you for the suggestion, Chris. I shall give him a try.

Update: sadly,  he has none at the moment.

Jamie

RE: Wanted: Ruby Brake Component BK76 or Suggestions for Repairing It - andrew34ruby - 27-05-2025

A few photos of the damaged one might help in deciding how/if it can be repaired.

RE: Wanted: Ruby Brake Component BK76 or Suggestions for Repairing It - Jamie - 28-05-2025

These pictures show the self-inflicted damage.
.png   Screenshot 2025-05-28 082705.png (Size: 155.57 KB / Downloads: 321)

.png   Screenshot 2025-05-28 082632.png (Size: 143.85 KB / Downloads: 318)

Failing a replacement part, my thoughts are to either:
  • get the melted part welded up again or
  • cut a metal plate to the same profile as the part and have it welded to the casting. I can then drill an ream a new hole
There is a welding firm nearby that can weld castings.

However, I would welcome suggestions as well.

Jamie.

RE: Wanted: Ruby Brake Component BK76 or Suggestions for Repairing It - Chris KC - 28-05-2025

Yikes.

Where are you based Jamie?
There is Stonehurst Rally next weekend (Leicestershire) and Beaulieu A7 Rally coming up at end of June, both attract a selection of well-known A7 traders with cart-loads of parts. If you can't see the part you are looking for, talk to them. You doubtless could weld that up, but I'm no metallurgist and for my money I'd sooner find one in better shape, considering that it's a 'safety' part.

RE: Wanted: Ruby Brake Component BK76 or Suggestions for Repairing It - Jamie - 28-05-2025

Thank you, Chris.

I am in Aylesbury. It is my daughter's wedding next weekend, so I suspect that I would be a trifle unpopular were I to pop to Stonehurst. Beaulieu might be an option, though. I shall check the date.

Jamie.

RE: Wanted: Ruby Brake Component BK76 or Suggestions for Repairing It - andrew34ruby - 28-05-2025

Rather than build up with weld, I would cut off the damaged bit and make a new piece to weld on. Extend to a point part-way up the original section. In my rough sketch blue is original metal and red is new metal.

   

RE: Wanted: Ruby Brake Component BK76 or Suggestions for Repairing It - Reckless Rat - 28-05-2025

Personally I'd rather replace the part. It's a critical part of the braking system and if it's going to fail it will be in extremis, when you really need it not to. If this is cast steel then it will need a welding specialist to do a "proper job" on it, using stellite rods and heat sinking.

RE: Wanted: Ruby Brake Component BK76 or Suggestions for Repairing It - Jamie - 28-05-2025

(27-05-2025, 06:21 PM)Chris KC Wrote: Sorry to hear that Jamie. Have you tried Tony Leslie (Holmesdale Sevens)? I should have thought he could find you one.
https://oldcarservices.co.uk/austin-seven-specialists/

(28-05-2025, 10:36 AM)Reckless Rat Wrote: Personally I'd rather replace the part. It's a critical part of the braking system and if it's going to fail it will be in extremis, when you really need it not to. If this is cast steel then it will need a welding specialist to do a "proper job" on it, using stellite rods and heat sinking.

I have been in touch with a local welding firm who have advised against welding mild steel to it because of the problems that that can cause. They are talking about using specialised rods, which is encouraging. However, I confess that a replacement part would be preferable.

Jamie