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Brake load sensing valve
Topic Started: Jul 28 2015, 09:09 PM (1,563 Views)
Daily terroriser
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My 35s12 failed not today on a front lower arm which I can get new for £108 which is bloody cheap! But the bit I'm finding hard to swallow is the brake load sending valve. It failed on it last year and I managed to free it up. This year though it's seized solid. I've managed to free the piston up but it's like something internally is stuck fast!
I have found a new valve for £155 but that price seems a bit of a piss take for something that is basically half a wheel cylinder!
Has anyone purchased one any cheaper or am I going to have to grease myself up and prepare for penetration?
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Dirk VG
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the arm pushing the valve gets smaller, hence pushing less
the piston gets rusted solid, hence no rear brakes

I by-passed the brake line and unbolted the whole mechanism
works fine but I have a rather heavy box on so rear wheels don't block easy under heavy braking

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Daily terroriser
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I spoke to the mot station about is it a failure if it's not there. They said if I remove it n go direct to rear wheels it's still a failure :(
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Spooky_b329
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Try JS Commercials in the forum index, he may have a half decent used one. But for the effort of changing it, probably worth just paying for a new one...it'll last longer especially if it gets a spray of grease every now and then.
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Daily terroriser
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I picked up a fairly decent looking one from truck busters in rugby today. It came of a 2006 model. Looking at it there is no corrosion on the shaft and even the body of the valve isn't corroded so I'd say it works. I fitted it today and bled the brakes. The mot testing station said it shout push out slightly when pressing the brakes. I jumped under the van n got the missus to jump on the brake pedal. No movement......
Looking at the setup has left me asking questions. When the link bar from diff is connected the valve is fully in? That's with nothing in the back either.
Could someone shed some light on this for me please?
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Bazil-S
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Hi,

Without weight the valve output is strangled. The valve opens proportionally to the rear axle loads ie, the higher weight load the stronger rear brake.
On models "L" and "S", those with single wheel, the proportional valve have dual circuit, instead on models "C", twin wheels, the valve has only one circuit, hence the price difference.

This valve has the important job, especially when the vehicle is light without any load, to limit the braking torque that would otherwise block the rear wheels with a consequent skidding and jerking of the vehicle.
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