Vehicle & Technical > Defender

Brakes on 90

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V8MoneyPit:
I've got my specialist on the case, but have done a bit of digging in the mean time. When discs were fitted to the rear of a 90 (LA930456 onwards) the bias valve changed to part number to NTC8836. This is pre ABS.

The disc/drum valve was NRC8215. But, apparently, this was hardtops only  :-k

So, there is a difference, but I can't say what it is!

The front brakes may have changed at the same time though and this would also affect the front/rear balance. I'm still running the solid discs on the front. I have read on another forum that someone fitted 110 calipers to the front which solved the problem.

I might try one of these NTC8836 valves, but they ain't cheap!

ChrisW70:
I *think* the valve is the same across different set-ups, the way the valve is piped up does differ though.

If you have it, have a look at the diagram of the brake pipe set-up in Rave as this does show how the valve is connected with the different set-ups.

V8MoneyPit:
The NTC8836 is visually different to the earlier one that I currently have fitted. It has a bleed screw on it and the ports are in different locations. Obviously, I can't tell if it operates differently though.

If it's like an early Mini one, it would not limit rear pressure under normal braking. But when the brakes are hit hard the piston would deflect further and restrict the outlet port.

V8MoneyPit:
Just looked a bit more....

NTC8836 has 3 pipe ports on it. The older ones only have 2. How are the 3 ports plumbed?

But....
NRC8215, which appears to be the earlier one was not only fitted to drum rear 90's, but also to 90's fitted with vented front/solid rear discs from  LA930456 to LA939975. So, on this basis, it should also work fine with solid discs all round as long as the pistons in the front calipers are the same diameter and the pads are the same size..... I'll keep digging  :D

Update:
There doesn't appear to be a master cylinder change at the same VIN as rear disc introduction. Equally, the front caliper pistons and pads didn't change. The caliper part number changed because it had to be wider for vented discs, but the pad and piston areas seemed to remain the same.

This all suggests that the earlier NRC8215 valve should be fine.

I'm beginning to wonder if it is just faulty and the disc brake conversion just highlights this.

graham2306:
Brilliant stuff, Keep going MoneyPit, the answer is there somewhere I hope.

Cheers Guys

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