My L200 has been laid up for a year and forgotten about by my son-in-law who owned the truck from new and because of a company car he now drives he's let me have the truck to fix up.
I have spent quite a lot of time working on the repairs and last week it went for a M.O.T and passed with flying colours but on driving it back home Its brakes failed, soft peddle and hardly any stopping power at all.
I limped it home and looked over the brake system but couldn't find anything amiss, fluid level ok so no leaks on the system so thought the simple thing to do would be bleed the brakes as air could be the problem.
I found no air in the system and a good flow of fluid from both the front pistons but hardly any flow from the rear bleed nipple when bleeding off fluid.
Also when pumping the brake peddle quickly the front brakes work but no braking on the rear wheels at all.
For the truck to pass a M.O.T then within 2 miles fail with no brakes there must be something sticking somewhere.
Any help I would be thankful.

this may have something to do with your load sensing valve ? clevererer people will be on at some point to explain how it works, what it does, where it is and how to possibly fix/replace it .......... hopefully

Cheers Krutly,yeah I think you right because for it to happen so quickly it must be something like that, I hope its a easy fix/repair as I'm itching to get driving my new truck and I've just taxed it ready for the road.

Load sensor is a very likely cause as it is possible for it to stick closed if it is partially siezed, shouldn't have caused spongy brakes though.. the LSV sits under ther ear axle and changes the amount of braking in relation to the load on the rear of the vehicle. As the load increases the LSV opens and allows more fluid to the rear brakes, and a s such improves the braking to the rear.
Full braking on the rear with no load would cause skidding of the rear wheels ( and the undies) at very low speeds..

Do k-74s have vacuum/servo assist brakes?

Don't know but assume that's the servo below and behind the reservoir?

Big round thing.

Thanks for replies and advice, I will have truck jacked up and see if I can locate this load sensor

Over the rear axle, set off to the passenger side, with an arm connected to the diff cover.

Quote: LezT wrote in post #9

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Over the rear axle, set off to the passenger side, with an arm connected to the diff cover.

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Need a pic mate so we can see what you've got please...
Handbrake light could also be fluid level, but check the little switch under the handbrake is switching off properly..

Ok I'll try and get some pics tomorrow and at the same time have a look at this h/b switch.
Thanks again.

If you disconnect the wire from the switch it'll not work, it 'sees' a negative through the switch ..and I'm sure there are no pad pick-ups on the classics..so it won't be a wear indicator on a caliper..

Quote: LezT wrote in post #11

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Need a pic mate so we can see what you've got please...
Handbrake light could also be fluid level, but check the little switch under the handbrake is switching off properly..

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The thing above the axle is the diff lock compressor mate

In pic 3 the bracket that the pipe runs up the front of should have the LSV actuator arm connected to it... does yours have ABS..?

Oh that's what it is so nothing to do with load sensor then.
Where should I find the load sensor as I take it should be attached to the under chassis then linked to the rear axle via this empty bracket on the diff.
Sorry for all the questions.

no the thing in the pics is for the locking diff, on the rear axle there is a 'T' piece with brake ipes running out to each rear wheel, from that there should be a flexi pipe up to the chassis... where it goes to the chassis should be the LSV...... I need to confirm with someone that ABS truck have an LSV still, but I am fairly certain that they should have. @Alan G

didn't read your last post as I was typing my message, yes has abs.
I think it may be best if I got hold of a workshop manual and have a read up as its a bit unfair of me asking what's wrong when I have little knowledge of the workings of this truck so thanks for you kind help and I will do a bit shopping tomorrow.
Thanks again.

Workshop manual on here free mate, just download the bits you need.... 2 mins and i'll do a linky thing..

All the manuals are in the workshop section.. use tham as you need to..

BRAKES...
Basic Brake System
Parking Brakes
ABS 2WD
ABS 4WD

What a helpful site this is the most helpful I've ever been a part of........10 outta 10

Get us all feckin big headed ya will leave off..... when we started this place it was one of the things that really bugged us on the 'other site'... pay your membership... oh and now we'll sell you a manual.... yea right ..
This what what we wanted as a forum mate.... helping each other out..
If there is a knowledgable member near you they would most likely get over and point all the bits out to you..
What area are you in BTW..

PM sent O helpful one. hahaha.

Thanks Luv..