Rear brake pad pin confusion

[05omegav6]

Actually the vented calipers contain 42mm diameter pistons, but the principle stands...

Not including the pistons/seals/machining... the bare bones of what differentiates a vented caliper is...

[Andy B]

...
Hows that work then ? Surely if that was done the pads would not float 

Replace the proper pin with a split pin ie make both holes the same the outer hole .... insert long split pin & bend the end over on the inside 

As above though, due to the longeity of the pins, I'd bite the bullet if I needed them & buy the proper pin 

[05omegav6]

...
Hows that work then ? Surely if that was done the pads would not float 

Replace the proper pin with a split pin ie make both holes the same the outer hole .... insert long split pin & bend the end over on the inside 

As above though, due to the longeity of the pins, I'd bite the bullet if I needed them & buy the proper pin 

What like these do...

http://www.ebay.co.uk/itm/FORD-GRANADA-MK2-1977-1985-FRONT-BRAKE-PAD-PIN-KIT-FOR-VENTED-DISCS-BPF0983A-/331327611586?hash=item4d24aa22c2

Not sure they are quite long enough though, but you get the idea

[EMD]

...
Hows that work then ? Surely if that was done the pads would not float 

Replace the proper pin with a split pin ie make both holes the same the outer hole .... insert long split pin & bend the end over on the inside 

As above though, due to the longeity of the pins, I'd bite the bullet if I needed them & buy the proper pin 

[Andy B]

...
Hows that work then ? Surely if that was done the pads would not float 

Replace the proper pin with a split pin ie make both holes the same the outer hole .... insert long split pin & bend the end over on the inside 

As above though, due to the longeity of the pins, I'd bite the bullet if I needed them & buy the proper pin 

What like these do...

http://www.ebay.co.uk/itm/FORD-GRANADA-MK2-1977-1985-FRONT-BRAKE-PAD-PIN-KIT-FOR-VENTED-DISCS-BPF0983A-/331327611586?hash=item4d24aa22c2

Not sure they are quite long enough though, but you get the idea

That would work 

[EMD]

Hmm i wonder if i should get those and get my money back from stealers 

[05omegav6]

Hmm i wonder if i should get those and get my money back from stealers 

No, because they might not fit

[EMD]

Hmm i wonder if i should get those and get my money back from stealers 

No, because they might not fit

If suitable pieces of rod was bought they could be knocked up easily  I wonder if i see an opening into production  I can get measurements from originals when they come and make a batch 

[Diamond Black Geezer]

Actually the vented calipers contain 42mm diameter pistons, but the principle stands...

Not including the pistons/seals/machining... the bare bones of what differentiates a vented caliper is...

Ah, cheers Al. Nice to know. Also nice to see a picture showing the literal differences between the two.

That being the case, then, I wonder how do we stand regarding refurbing the rear calipers with new seals and boots? For the fronts this posed me no problem, I have found many people selling rubber repair kits for standard Omega rear calipers, but what about the larger 42mm pistons, I wonder... Presumably there'll be another 42mm pistn out there; having said that, that's exactly the logic EMD was thinking regarding the pins in the first place.

Any 'upgrade' to vented rear calipers seems to become less and less feasible with every post... hmmmm 

[Nick W]

Hmm i wonder if i should get those and get my money back from stealers 

No, because they might not fit

If suitable pieces of rod was bought they could be knocked up easily  I wonder if i see an opening into production  I can get measurements from originals when they come and make a batch 

I've been thinking a bit more about this and have come up with this, with all dimensions from Al's other post:


6mm rod is a standard size and cheap.


turning the short 5mm diameter is trivial.


We need some way of making a light press fit on the 'wide' end, which on the original part is a sprung clip. Making that is going to be a pain. An R-clip in a crossdrilled hole will work, but isn't much easier. A nice deep knurl will give the same effect, as it will increase the diameter a bit and is easy to do. Some experimenting might be required, but it can't be critical as the sprung clip isn't going to be a particularly precise fit.


5minutes work on the lathe should produce a prototype, which I might try later today.


I can't see any reason why 4 pins should cost more than a tenner posted to anyone.


I've previously mentioned that the pins are easy, and I hope this post shows why. Anyone who has these calipers should be more concerned about the springs, as they are going to be much more difficult to reproduce.


And Al's latest picture shows that the wider vented caliper is produced in the traditional way with spacers and longer bolts in the original, non-vented casting. I wouldn't be worried at all about reconditioning those, as 42mm seals are going to be a standard size. Pistons are easily made from stainless bar, and any necessary alteration to the seal grooves can be accomodated in the process. I've a friend who made all 16 caliper pistons for his NSX calipers from a £35 length of stainless bar. He wasn't going to pay the £150 that Honda wanted for each psiton!

[05omegav6]

Hell, you could cross drill the rod at both ends for the R clips... possibly quicker and easier than flaring it

Best to keep the narrowing on the inboard end, if only to provide a consistent position

[Nick W]

Hell, you could cross drill the rod at both ends for the R clips... possibly quicker and easier than flaring it

Best to keep the narrowing on the inboard end, if only to provide a consistent position

Flaring the end of a 6mm rod is just a matter of hitting it end-on with a hammer. Cross-drilling it is a fiddly process, requiring centering the spindle, putting a flat for the spotting drill(done with a file, but it's still another operation), then drilling through and finally deburring both ends of the hole. We're talking a pretty small hole too, I wouldn't want it to be any bigger than 2mm. Doing all that twice per pin would make a professional charge a lot more! And you'd need to source the clips.


My suggestion of knurling the wide end is to retain the entire pin in a similar manner to the spring clip, and be quick and easy to do. Which it is when the knurling tool is in a quick-change toolholder.


Narrowing the inboard end is vital. I should have written that it is a trivial operation.

[EMD]

For those that dont know or didnt know like me , the brake pad pins number for vented rear discs is :  GM 9195055


Just picked the full set up . Wallet feels a lot lighter now 

[Nick W]

I had a go at this yesterday.

I had to use silver steel as it was the only 6mm stock I have. As expected, less than 5minutes work produced a respectable pin. But silver steel is quite hard, and the knurl only increased the diameter by 0.25mm which isn't enough. Mild steel deforms more than this, so I still think it's the way to go.

A 2m length of 6mm rod costs £3.50 from B&Q; better quality is likely to be cheaper from a proper supplier. But even at that price, it would make enough pins for five cars.

[Steve B]

I had a go at this yesterday.

I had to use silver steel as it was the only 6mm stock I have. As expected, less than 5minutes work produced a respectable pin. But silver steel is quite hard, and the knurl only increased the diameter by 0.25mm which isn't enough. Mild steel deforms more than this, so I still think it's the way to go.

A 2m length of 6mm rod costs £3.50 from B&Q; better quality is likely to be cheaper from a proper supplier. But even at that price, it would make enough pins for five cars.

I think this is a great idea considering the problems on getting hold of them,And the stupid price main dealer charged EMD

Nice one Nick W