Datsun Roadster Forum-311s.org

Those look pretty sweet. Yes, please let us know how well they work.

Will

We'll see. Nice thing is the threads are all the same.

Those do look very nice - four pistons and more than double the pad surface. Price is reasonable, too, when you consider that to replace the stock pistons you'll spend more than $400. Am I missing anything, Curtis? It looks like a great upgrade.

How does the brake flex hose connect up to the caliper?

Mike

mikeb wrote: Wed Dec 18, 2019 3:29 pm Those do look very nice - four pistons and more than double the pad surface. Price is reasonable, too, when you consider that to replace the stock pistons you'll spend more than $400. Am I missing anything, Curtis? It looks like a great upgrade.

How does the brake flex hose connect up to the caliper?

Mike

Same way, metal line.

SLOroadster wrote: Fri Jul 19, 2019 2:20 pm

Curtis wrote: Thu Jul 18, 2019 3:05 pm
There are several available. Put in jaguar e type front brake upgrade. None of them are cheap. Lowest I found is just over $500.

How much is a set of Wilwoods, or any other aftermarket brake calipers? I'd guess they are more.

Will

Wilwoods Dynalites are $170 and much lighter

Looks like they need an adapter.

They don't have Datsun and they don't have Jaguar bolt on kits.

Curtis,

I reached out to the folks at Zeus re ordering and mentioned that it was for a Datsun Roadster and received the following response, in part:

"We are currently undertaking a project on the Datsun Fairlady with a view to ensuring we can supply into the Datsun Roadster mark.. we in particular need to verify the fit around the disc. we manufacture our brakes here on site so do not anticipate too many issues. The cars are as we say here 'right up our street' and engineers are keen to finalize fit early in the new year.

Your discs will differ in thickness. We would need to verify your disc thickness with you and it may be better for you to utilize your existing disc and we would supply the calipers only.

We would like to contact you again early in January with regard to supply as we are currently completing a new system for the Cobra.

Shipping out to you is not a problem as we ship all over the world and have good shipping rates"


I'm pretty sure that the Sumitomo licensed caliper assembly was an exact copy of the Dunlop unit, but it's nice to see the roadster get some recognition!

Mike

Yes, I am emailing with them and sending pictures. I did a stupid thing and told them they were going on a Datsun. So they seem to be very conservative about the whole thing and looking it over. They actually want it to work on the Datsun as another market for them.

If they say no I will buy the Coopercraft or Fosseway and keep my mouth shut. Seriously, the calipers are identical in every way needed. My only concern is the added braking might make the rear end swing around during hard braking. The Jaguar forum reports it had not been a problem but the Jaguar is heavier and longer.

Hi Curtis-

The only time the rear might swinging around is when the rear tires are locked and already sliding. I am following this with great interest.

mikeb wrote: Fri Dec 20, 2019 1:13 pm
Your discs will differ in thickness. We would need to verify your disc thickness with you and it may be better for you to utilize your existing disc and we would supply the calipers only.

Thats a bit of an issue. If the roadster rotor is below minimum thickness for their caliper spec, the pistons will reach maximum travel before the pads are worn out. As the pads continue to wear, the pistons will pass maximum travel point-thats quite dangerous.

May require a custom caliper as they suggest unless the rotors are the same thickness.

If I was going to do a caliper upgrade, I'd definitely go with a light vented disc regardless, better all the way round.

J

That is misleading on the thickness. I sent them the specs. They are suggesting the cast iron version for a stock disc. The jaguar stock disc is .5 thickness as far as I can find. Their engineers are looking at it.

The whole idea of this is a bolt on. If I wanted vented I certainly wouldn't bother with this.

I found a minimum thickness for the Jag is 8mm or .315.

From the 311s wiki.

New rotors are approximately .433" thick with a minimum thickness of.325".

I just called a Jaguar supplier and the new rotor from the shelf is stamped 8.6mm minimum or 0.3386

I recently bought a set of DBA slotted rotors from Dean and brand new they measure .415 in or 10.541 mm.
They show a stamped minimum of 9.4 mm or .370 in.

I guess we'll just have to let the engineers at Zeus sort it out.