Vigo Load sensing valve working?

[Mornes]

The load sensing valve on my Vigo doesn't seem to make a difference to my breaking ability. I have essentially set it up max on an extended threaded rod with no effect. Is this a common symptom or issue?

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[Mud Dog]

What makes you think it's not working? What do you typically carry in the rear full time.

Remember this, most of the braking (on forward movement) is achieved through the front wheels and less brake fluid pressure is apportioned to the rear in a standard set up otherwise the rear wheels would lock up when braking. The LSPV is there to allow more hydraulic pressure on the rear when there is a load.

From your avatar pic I can see that there is a canopy. Although not much, it does add some weight - what do you carry inside. More importantly, I see the you have larger tyres - the increased diameter gives the wheels more leverage against the braking force, front and back. The tyre compound, width of the tread and road surface also plays a huge part in whether or not the wheels will be able to lock up under braking. Have you raised the suspension?

So it could be that the LSPV is fully open but because of some or all the above factors there is just not enough braking power to lock the rear wheels.

That is all assuming that your braking system is in optimal working condition. If the rear drums or shoes are glazed it would also have a big influence as does the compound of the brake lining.

If your problem is one that the rear wheels are indeed locking up, then you are adjusting into the fault rather than against it by extending the length of the arm, thus making the problem worse.

[Mornes]

Great details here.

I have fitted these larger tyres (285 70 17) recently and understand that the larger inertia will affect braking, but the problem stems from before this.

Suspension is indeed raised by approx 50mm.

I have an aluminium canopy and 70 liter fridge mounted permanently in the back.

Brake linings should be ok as they were replaced less than 10 000km back by agents.

I have never seen lock up in the rear which essentially leads me to believe that my rear isn't assisting as much as it should.



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[Mud Dog]

Ideally the wheels should never lock up Morne. Since I'm old school and don't always immediately relate to newer tech, I failed to recognise that your model is fitted with ABS. This of course will also prevent lock up.

Here's the thing ... the rear brakes must be working but your question is how effectively. To find out you could take it past an AA test station, roadworthy centre or brake specialist that have a "rolling road" which can measure the braking force on each wheel. Then you'll know for sure. If you're an AA member they might even do the test for free but either way it shouldn't cost too much and it will either give you peace of mind or identify a problem.

I'm no ABS fundi, but if there is a way to disconnect the rear ABS units, you could do a basic test on gravel and then a harder surface to see if you can get the rear to lock up without ABS. However, brakes are a critical component, so I would rather pay the couple hundred sheets and have a professional assesment.

[Mornes]

Thanks Mud Dog

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