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Grenadier

Member Since: 23 Jul 2014
Location: The foot of Mont Blanc...
Posts: 5895

2011 Defender 110 Puma 2.4 DCPU Corris Grey

110 2.4 TDCi Non-ABS - Bias Valve

Hello all.

I’m looking to replace my brake lines, going flexible through Pioneer. This will be the NS and OS lines, plus the chassis to servo line.

Pioneer have asked if I have a Bias Valve, and as far as I can tell, I don’t. I hand felt and visually inspected along the entire length of the chassis, and up the bulkhead into the engine bay, and as far as I can tell, it’s one straight-through, OE copper pipe.

I have a MY2011 110 2.4 DCPU Non-ABS model w/ rear calipers. All original as far as I can tell/know. The pick up area is original, and has no added weight from a roll cage, rack or both.

Couple of questions before I go back to them:

A. Does the following photo indicate that balance is done by the servo?
B. If not, should I have a brake bias valve and would it be advised that I fit one when replacing the lines?

Note that I’ve never had any problems or unforeseen lock-ups of the rear, notably living in an environment where I’m often braking hard and on steep downhill descents when the weight will be particularly nose-heavy, and the back perhaps as light as it’s ever likely to be.

Any thoughts?

Thanks as always.

Click image to enlarge

Click image to enlarge Monsieur Le Grenadier

I've not been everywhere, but it's on my list.....

2011 Puma 110DC - Corris Grey

16th Oct 2025 2:42pm

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 6047

2006 Defender 110 Td5 USW Zermatt Silver

The brake bias valve is on the one line from master cylinder that goes to the rear, and is near the master cylinder/bulk head area.

I doubt you have one fitted. And your system will be balanced/set by the master cylinder

16th Oct 2025 3:22pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 18024

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

To the best of my knowledge you do not have one, should not have one and don't need one.

I have an older but essentially similar vehicle and do not have one.

16th Oct 2025 3:27pm

Grenadier

Member Since: 23 Jul 2014
Location: The foot of Mont Blanc...
Posts: 5895

Thank you both. I’ll run with ‘don’t have one, don’t need one’.

Monsieur Le Grenadier

I've not been everywhere, but it's on my list.....

2011 Puma 110DC - Corris Grey

17th Oct 2025 8:28am

I Like Old Skool

Member Since: 23 Feb 2015
Location: Manchester
Posts: 881

1994 Defender 110 300 Tdi ST Coniston Green

Why the swap to flexible (braided?) hoses instead of quality cupro pipe?

Also, you might want to replace your cracking brake servo before spending on blingy brake hoses?

17th Oct 2025 2:49pm

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