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Disc brake actuator

Technical help for Series one, two and three Lambrettas. Models include the Li, Li Special, TV, SX, GP, Serveta and API/SIL models

Disc brake actuator

Postby Storkfoot » Fri May 22, 2020 9:09 pm

How do you separate this for plating? Is it preened over ?

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Re: Disc brake actuator

Postby HxPaul » Sat May 23, 2020 8:48 am

Just sandblast it,usually theirs an i cap covering the outside and you dont even see the inside(spring side) because its inside the brake.https://www.ebay.co.uk/itm/LAMBRETTA-FR ... SwTfBcdqBn
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Re: Disc brake actuator

Postby gaz_powell » Sat May 23, 2020 12:43 pm

Paul
I've never stripped one but looking at that one and the remade ones, I'd say they are press/peened over
Good luck
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Re: Disc brake actuator

Postby Warkton Tornado No.1 » Sat May 23, 2020 1:25 pm

I think that I had one apart many years ago, but cannot swear as to how, or even why :?

Because the spring is very strong (like a die spring) they need compressing in a vice with a socket/tube over the pin end. Ideally they need compressing with something that allows access to the end, so an open ended thick spanner (or two) of the right size between the vice jaw & the spring collar.

The balls are just a standard ball bearing.
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Re: Disc brake actuator

Postby coaster » Sat May 23, 2020 2:26 pm

I have an unused pattern one if its any use to you Paul?
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Re: Disc brake actuator

Postby vegansydney » Sat May 23, 2020 2:38 pm

A friend (and mentor) of mine rebuilds these. He submitted the instructions to v2 of the Spanners Manual but I guess they got left on the cutting room floor.

Basically, grind the peened top off, replace the bearing and electroplate everything before reassembling with a high tensile button head bolt. He made a basic jig to hold everything together. I'll see if I can PM you some photos over the weekend.
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Re: Disc brake actuator

Postby Storkfoot » Sat May 23, 2020 2:39 pm

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Prised bearings out which is just as well as they were in a bad way. Still can’t see how to separate without knocking the preen off :?
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Re: Disc brake actuator

Postby Storkfoot » Sat May 23, 2020 2:42 pm

coaster wrote:I have an unused pattern one if its any use to you Paul?


Thanks, mate. I do actually have another one that a previous owner chromed. However, I’d like to save that one for another day :)
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Re: Disc brake actuator

Postby Storkfoot » Sat May 23, 2020 2:43 pm

vegansydney wrote:A friend (and mentor) of mine rebuilds these. He submitted the instructions to v2 of the Spanners Manual but I guess they got left on the cutting room floor.

Basically, grind the peened top off, replace the bearing and electroplate everything before reassembling with a high tensile button head bolt. He made a basic jig to hold everything together. I'll see if I can PM you some photos over the weekend.


That would be brilliant if you could let me see what he did. Thanks, Benji ;)
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Re: Disc brake actuator

Postby dickie » Sat May 23, 2020 2:57 pm

If you get it electroless nickel plated you could give them it in that condition.

It gets dipped (in acid?) first which removes the rust and crap and the nickel gets to all the nooks and crannies without disassembly.

I've had stuff as bad as that done.
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Re: Disc brake actuator

Postby Storkfoot » Sat May 23, 2020 7:05 pm

dickie wrote:If you get it electroless nickel plated you could give them it in that condition.

It gets dipped (in acid?) first which removes the rust and crap and the nickel gets to all the nooks and crannies without disassembly.

I've had stuff as bad as that done.


Not a bad shout. That, as long as it gets to all the rust, new 8mm bearings and a liberal dollop of grease should get a functioning actuator.
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Re: Disc brake actuator

Postby dickie » Sat May 23, 2020 8:25 pm

I prefer the idea of a button head screw for future maintenance though.
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Re: Disc brake actuator

Postby vegansydney » Mon May 25, 2020 4:23 am

dickie wrote:If you get it electroless nickel plated you could give them it in that condition. It gets dipped (in acid?) first which removes the rust and crap and the nickel gets to all the nooks and crannies without disassembly.


I'm a huge fan of electroless nickel. The first thing I do after stripping down a scooter for a rebuild is send all the hardware off for electroless nickel plating. I love the consistent finish, without the watermarks associated with electroplated zinc. It also looks close to factory finish and is stupidly cheap to do. That said, due to the thrust roller bearing inside the actuator, I'd be cautious about doing it on such a critical safety component, but that's just my 2 cents.

Here's a photo I took today of a rebuilt actuator on my GP. It was rebuilt by a friend and mentor, James P. (some might remember him from the old forum). It utilizes a high-tensile button head. The actuator shaft needs to be tapped to accept the button-head. High strength threadlocker is also recommended. This particular one has been in regular use for over 10 years without any issues.

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Re: Disc brake actuator

Postby Storkfoot » Mon May 25, 2020 9:22 am

Thanks, Benji. I’ll do that.
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