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Brake Bias Valve on a 90?


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same as my 110, you could mod the piping to delete that or retain it & add the later PRV, LR rationalsed the brake system parts in 1991 when 90/110 became Defender 90 & 110.

it gives a note in defender workshop manual to the effect the some 110 models have the PRV depending on local legal requirements. so adding one [if not fitted] should fairly easy with new pipes off the shelf or made up.

Thats a different set up to my 110 altogether. Mine is more like the one on page 494 of the 110 parts manual (Sorry, can't put pictures up at work). I already have the PDWA fitted but it still doesn't help. I'm planning on fitting somthing more like this:

http://www.ebay.co.uk/itm/Brake-Bias-Valve-Screw-Type-Rally-Proportion-Adjustable-Prop-Adjuster-Track-Car-/161046686763?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item257f216c2b#ht_1718wt_1111

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Thats a different set up to my 110 altogether. Mine is more like the one on page 494 of the 110 parts manual (Sorry, can't put pictures up at work). I already have the PDWA fitted but it still doesn't help. I'm planning on fitting somthing more like this:

http://www.ebay.co.uk/itm/Brake-Bias-Valve-Screw-Type-Rally-Proportion-Adjustable-Prop-Adjuster-Track-Car-/161046686763?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item257f216c2b#ht_1718wt_1111

this one http://www.brit-car.co.uk/product.php/164822/0/brake_valve_assy_with_disc_drum_def

which is a combined PDWA & PCV ???

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I thought the brake biasing was internal to the main brake sevo/master cylinder housing on all defenders?

If you are talking about the PDWA then my 110 definately has one. It is on page 493 of the parts manual.

I cannot get my 110 to stop locking the rear wheels. I was just putting it down to not having enough weight on the rear end and too much on the front (whinch etc) combined with MTs.

I have been looking into fitting an adjustable brake bias valve to correct this.

I had this problem on my 110 Van, after I did the chalk test on the tyres and dropped the pressure in the rear tyres from 42 to 34/36 it pulls up far more square.

Dave!

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No, mine is NRC7871 but what I meant was that the master cylinder and brake pipe layout was different from those pictured. Mine are like this:

http://www.landroverworkshop.com/diagrams/braking-systems/hoses-pipes/front-rear-drums_52924#3

May try reducing the pressures in the rears. I think I am running at 35 ish anyway but they are same front and back.

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No, mine is NRC7871 but what I meant was that the master cylinder and brake pipe layout was different from those pictured. Mine are like this:

http://www.landroverworkshop.com/diagrams/braking-systems/hoses-pipes/front-rear-drums_52924#3

May try reducing the pressures in the rears. I think I am running at 35 ish anyway but they are same front and back.

exactly the same layout as my '89 110CSW, but no pressure reducing valve in that circuit, just the PDWA which switches a dash warning light on, if the front or rear circuit fails.

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