Disc Brake Conversion.

**jakeslouw** · 26th May 2010, 02:51 PM

Guys, 12mm steel will require dozens of tons before it even starts bending, let alone to deform permanently.

The only issue I have with the template is the 2 holes for the caliper mounting (the bottom 2 holes in the scanned tracing): since most of the braking forces will mean rotational deflection, perhaps it would be good to DOUBLE UP the plating around the two "ears". Or at least add 5mm. If possible, of course.

**agrojnr** · 26th May 2010, 05:38 PM

If you want to go a little tougher use 350 grade type steel and after that you will have to go to a bisalloy.

They mount holes would take a farly long time to break but you could always make it out of 16 or 20mm

Adam

**Timj** · 26th May 2010, 08:48 PM

What is the normal material for disc brake caliper mounts? Surely there is no need to do more than what is on say an early Disco? After all the Series III would be less than 2000kg even in long wheel base wouldn't it? The SWB is less than 1500kg in station wagon form.

TimJ

**TJWA** · 26th May 2010, 11:49 PM

Originally Posted by banjo

Cool thanks. What size paper is it on my printer only has A4..
this caliper bracket will not fit a swivel housing with a rounded edge, only the ones with a straight cut chamfer.
How do i know which is which do i have to pull it all apart to find out or is it a year spasific.
Mine is a 1973 LWB origanaly a 6cyl now with holden 6cyl..

I think i mite be best to trace it off the screen...

It is on A4 paper (you can see the edges of it in the scan).

Here is a photo of a straight edge swivel housing and a rounded edge swivel housing. Note the edge that runs from the top raiko bearing support to where the edge of the hub support runs to. Two out of my six Series III's have one straight edged hub, the other rounded! It doesn't seem to matter what year or model they are, they can be either. The rounded edge swivel housing does not leave enough room to get the two caliper bolts in once the bracket is mounted.

**isuzurover** · 27th May 2010, 12:52 AM

Originally Posted by TJWA

It is on A4 paper (you can see the edges of it in the scan).

Here is a photo of a straight edge swivel housing and a rounded edge swivel housing. Note the edge that runs from the top raiko bearing support to where the edge of the hub support runs to. Two out of my six Series III's have one straight edged hub, the other rounded! It doesn't seem to matter what year or model they are, they can be either. The rounded edge swivel housing does not leave enough room to get the two caliper bolts in once the bracket is mounted.

The swivel housing is fairly thick. A number of disc conversions I have seen have required some grinding of the swivel housing. However I am not sure what an engineer would say about that.

**TJWA** · 27th May 2010, 01:01 AM

Originally Posted by isuzurover

The swivel housing is fairly thick. A number of disc conversions I have seen have required some grinding of the swivel housing. However I am not sure what an engineer would say about that.

I'm going for a "no grind" approach so I have switched the offending hubs on my road vehicles to the straight edge type.

**chazza** · 27th May 2010, 07:07 AM

Originally Posted by TJWA

The rounded edge swivel housing does not leave enough room to get the two caliper bolts in once the bracket is mounted.

Would there be room for studs in the caliper and nuts on the other end?

Cheers Charlie

**TJWA** · 27th May 2010, 08:38 AM

Originally Posted by chazza

Would there be room for studs in the caliper and nuts on the other end?

Cheers Charlie

That's a good point, I'll have to try it out. Even with the straight edged swivel housings the caliper bolts only just fit in.

**Lotz-A-Landies** · 27th May 2010, 10:03 AM

Originally Posted by Timj

<snip>
After all the Series III would be less than 2000kg even in long wheel base wouldn't it? The SWB is less than 1500kg in station wagon form.
TimJ

Tim

I think that the 109 Station Wagon variants are getting up around 1900Kg with all the glass and extra trim. A military SIII FFR is around the same with the generator and additional batteries and the SIIB 1970 Kg tare with a 1250 Kg X-country payload making a total well over 3 tonne, so material required for stopping that mass from 100KPH is significant.

Originally Posted by agrojnr

<snip>
The mount holes would take a farly long time to break but you could always make it out of 16 or 20mm

Adam

Given that the calipers clamp the both sides of the mounting tabs, the limiting factor will be the dimensions of the caliper mounting.

Originally Posted by TJWA

That's a good point, I'll have to try it out. Even with the straight edged swivel housings the caliper bolts only just fit in.

If the room is too critical, it may be a case that you have to mount the caliper to the plate before mounting the plate onto the swivel housing.

Diana

**banjo** · 27th May 2010, 12:36 PM

Originally Posted by Lotz-A-Landies

If the room is too critical, it may be a case that you have to mount the caliper to the plate before mounting the plate onto the swivel housing.

Diana

That sounds like a realy good way i think i will do it that way when i do get it done.......

Thread: Disc Brake Conversion.

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12mm is pretty thick

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