16 replies to this topic

[Tonyspit]

Looking for a new pair of rear calipers..

 

Just Wondering if anyone could point me in the right direction where the best place would

be to buy a pair.

 

Thanks..

[martinroger]

Why not refurb?

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[Tonyspit]

What I've heard if the Allen grub screw is seized which mine are you're looking 

at new calipers..

[Ivor]

What I've heard if the Allen grub screw is seized which mine are you're looking
at new calipers..

I'm sure that there are threads on here about sorting the grub screw, try an interweb Google search it usually finds the posts better than the forum Search

[Tonyspit]

Thanks I'll take a look..

[martinroger]

Make sure you use the correct Allen key first. 4.5mm (not 4) and preferably mounted on a socket, not as an L key. Then leave it to soak overnight with penetrating oil, and use a breaker bar on that 4.5mm socket bit. Sometimes they are just a bit stuck but people only have hand hex keys, so they can't get a lot of force there. It's an M10*1.0 thread so it is quite tight.

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[Tonyspit]

Believe it or not that's what I've exactly already tried also a little heat and the bugger won't budge..

Ended up snapping my 4.5mm snap-on socket bit off in the grub screw..

 

I'm in the Motor trade so I'm pretty switched on when it comes to things like this, but this bugger

isn't going anywhere..!!

 

Currently doing a full nut and bolt restoration on her and fitting a super charger plus loads of other

bits..

 

Thanks for the advice and once I get the broken bit out of the grub screw I'll give it another go.

 

Cheers

 

[mbes2]

https://www.elisepar...brake-calipers/

[zimmer]

Christopher Neil Lotus were the cheapest when I got new ones, but that was 5 years ago (£195 +VAT each back then!)

[Tonyspit]

That sounds good I'll give them a call tomorrow.. Cheers

[Mat Jackson]

Is there anywhere near to you that does spark erosion? That’s what he’s to be done to mine to get the screw out during refurb


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[Pidgeon]

Search for Contract Auto Engineering on here

 

 

[Lee37vernon]

Someone on here think was jayvx220 or similar was refurbishing then 6 and had a fix for the grub screw.. sure a search with jay may find it

[FLD]

I've drilled them out in the past.  From what I remember I used a 9 or 9.5mm drill and went to a depth of 25mm.  You can then pop the nub of the screw out from the inside of the caliper and re-tap the threads.  You do have to turn up a new screw but it's no major pain.  I do it from a 20mm long M10x1 grub screw.  The only trauma I found was getting the form tool right to put the radius spot on.

[Arno]

If you have access to someone with a mill then, like FLD, if you use a 9 mm endmill you can cut the treaded section off.

 

It's shaped like:

 

 

The final sealing section and locking tip will then be free and can be re-used.

 

Clean up the old threads in the housing and refit the sealing section and then just put a regular M10x1.00 bolt on top to lock it in.

 

Trickiest bit usually is to get the caliper set up in a mill so it can drill/mill exactly down and not damage the threads.

 

Bye, Arno.

[martinroger]

Technically the radius is only there for sealing and fluid tightness. The pin is here to prevent the piston wormscrew from rotating when actuating the handbrake mechanism. It could be possible to just machine the end of a M10x1.0 bolt into a dowel shape and then seal the whole thing using good thread sealant (not loctite 243/248!) that works ok with brake fluid...

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[Tonyspit]

Thanks everyone for all the info really appreciated..