Vehicle & Technical > Defender

Brakes on 90

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graham2306:
A mate of mine has recently bought a really nice 90.  It has a 300 tdi engine, discs all round and the rear axle is a Range Rover one (shocks at opposing angles).  The vehicle was built on a galvanised chassis and a has a 2" suspemnsion lift.

At the moment it is almost undriveable as it locks up the rear brakes long before the fronts, making it bloody dangerous.  It has new discs and pads all the way round and all the brakes work fine.  the master cyclinder is different to the one on mine and on a 110 we have looked at, it has 2 pipes out and is very long compared with mine which has 3 pipes out.

Other than that all the plumbing seems to be the same as mine.  What does the block on the chassis rail below the master cyclinder do? 

Any ideas what the problem might be anyone?

V8MoneyPit:
Hi

The 'block' on the chassis rail is a pressure reducing valve for the rear.

Mine have a Disco disc brake rear axle, but standard brakes everywhere else. In the wet, mine can lock the rear first. I'm not sure if there is a different valve available for the disc rear axle.

Axetamer:
Mine does the same locking the rears first even in the dry under heavy braking, mine was originally a 2.5 petrol with drums on the rear, but now is a 200tdi with a td5 defender rear axle converted some 10 years ago I am told, Like V8moneypit hinted at there is a different bias valve for discs all round, but I'm not sure of any part numbers, I have enquired about this down my local 4x4 specialist and it seems to be a bit of a minefield.....but like has been said bloody scary when you need to jump on the brakes!!

V8MoneyPit:
We are in the automotive industry and have contacts at a major LR wholesale company so I'll do a bit of investigation next week and let you know what I find. I really should sort mine out anyway!

graham2306:
Thanks guys.  We guessed it was some kind of restrictor valve and have since looked at several different vehicles, they all look the same, but I bet they aint the same inside.

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