LSPV Rear brake woes, MOT failure game

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LSPV Rear brake woes, MOT failure game

Post by HighlyJetted on Fri Sep 20, 2013 10:47 pm

On tuesday a local guy called me wanting an LSPV for a Hijet,

I agree'd to deliver it on Wednesday as I would be in Northwich anyway.

I told him to get his knackard one off before I got there as I would show him a thing or two about it.


He was told by the MOT station that it was seized thus why it had failed the MOT on lack of rear brake efficiency.

His LSPV valve was not seized, the plunger moved freely (they pull outwards not push inwards, just like every LSPV does I've come across Rolling Eyes )

Anyway, told him that he can have the new one I've brought, but personally I would strip and clean his old one and refit that as there is nothing wrong with it.

So I spoke to him yesterday, where he had failed the MOT retest Crying or Very sad 

So today after going shooting I went back up to see him, being a helpful sort of fool.

On his van, the bracket that mounts the LSPV was bent upwards, so the lever never had enough motion to actually contact the rubber "button" on the LSPV.

So I pulled(bent) the bracket back down to where it should be, helped him bleed his brakes as he'd changed a rear slave cylinder too, and now his back brakes work perfect.


Rear brake failure is very common on Hijets, and is always blamed on the greatly misunderstood LSPV - now I'm not doing myself any favours here, but I'm going to have to write some form of information article about them and their common system failure points. Although I quite like selling things, what I really like to do is get people back on the road properly and not chasing dead ends.

So here we go - Understand the misunderstood LSPV

LSPV valves rarely seize as the piston is constantly moving due to brake pressure every time you press the pedal.

The system stops working because:-

The LSPV actuation arm spring goes weak.
The upper bracket bends upwards due to overloading and poor build quality.
The LSPV actuation arm stops moving properly due to corrosion on the pivot.
The seals can fail in them, but then it would be actually leaking.
And finally yes, they can seize up inside.

The LSPV is fully rebuild-able. The inner is held in via 2 circlips underneath the rubber dust cap.
After these are removed the inners pull out.
You will find a spring, a couple of seals, a long shaft and that's it pretty much.

The spring keeps the "button" all the way in - so it never can be pressed.
Brake fluid pressure pushes it back out - touch the lever against the button and press the brakes - you will feel it push back at you.


I had someone try to collect an LSPV, but claimed the one I was offering was knackard as they couldn't press the button inwards. I showed them another one in bits to show them how it worked but they did not understand or want to understand.


What is the purpose of this post?

I'm sure you'll find out sooner or later Laughing Laughing Laughing Laughing

Another monologue rant by HighlyJetted. Wink
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Re: LSPV Rear brake woes, MOT failure game

Post by HighlyJetted on Fri Sep 20, 2013 10:59 pm





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Re: LSPV Rear brake woes, MOT failure game

Post by Logi on Sat Sep 21, 2013 8:54 am

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Re: LSPV Rear brake woes, MOT failure game

Post by Logi on Sat Sep 21, 2013 8:54 am

You're gonna like my new toy I bought for the shed Wink
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Re: LSPV Rear brake woes, MOT failure game

Post by HighlyJetted on Sat Sep 21, 2013 11:10 am

Tell me you've bought a motorbike rolling road ????
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Re: LSPV Rear brake woes, MOT failure game

Post by xxemaphorr on Sat Sep 21, 2013 12:51 pm

nice article. I had problems with mine as the M.O.T recorded the rear brakes as having 49% efficiency and either 50 or 51% was the minimum. I ended up stripping and resealing mine but this would have been helpful to me at the time. Its good of you to take the time to write these articles for people HJ.
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Re: LSPV Rear brake woes, MOT failure game

Post by xxemaphorr on Sat Sep 21, 2013 12:52 pm

and im pretty sure I ordered a spare from the isle of wight as a backup! Wink 
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Re: LSPV Rear brake woes, MOT failure game

Post by Logi on Sat Sep 21, 2013 3:31 pm

HighlyJetted wrote:Tell me you've bought a motorbike rolling road ????
Not yet, but I did buy an ultrasonic cleaning bath Very Happy 
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Re: LSPV Rear brake woes, MOT failure game

Post by HighlyJetted on Sat Sep 21, 2013 3:41 pm

Nice, that had them at aldi a little while back.

Is it big enough to fit a cylinder head in?!
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Re: LSPV Rear brake woes, MOT failure game

Post by Logi on Sat Sep 21, 2013 3:47 pm

HighlyJetted wrote:Nice, that had them at aldi a little while back.

Is it big enough to fit a cylinder head in?!
Yes.























































Off my latest purchase alien 

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Re: LSPV Rear brake woes, MOT failure game

Post by rich the mechanic on Sat Sep 21, 2013 8:38 pm

Blimey thats a little rarity see plenty of cub 90's not so many 70's or 50's plus a few town mates but I don't think I have ever seen the Suzuki version I don't even know what it's called.
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Re: LSPV Rear brake woes, MOT failure game

Post by Scarface GTti on Thu Mar 12, 2015 12:05 pm

HJ I just wanted you to know that your posts are very much appreciated. The post above gave me some pointers to check before pulling my valve apart. As it happened I did have to strip my valve as it was seized solid and it really took some effort to sort it but it moves great now. The only question I would have is that because the manual gives you a setup procedure that involves hydraulic pressure measurement, is there an easy way to set up the valve?

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Re: LSPV Rear brake woes, MOT failure game

Post by HighlyJetted on Thu Mar 12, 2015 3:25 pm

Yeah fuck all that.

Just adjust it to the max on the axle.
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Re: LSPV Rear brake woes, MOT failure game

Post by Scarface GTti on Fri Mar 13, 2015 8:58 am

Ok cheers

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