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Old 11-18-2009, 02:04 PM
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Line Lock Question

I took the truck for it's yearly Govt. test (MOT) & discovered I had little or no rear braking power.

When I was fitting the running gear, 'my man' suggested I fit a line lock, which he conveniently produced from amongst the various bits & pieces on his work bench.

Long story short, we had a misunderstanding & I had to ship the truck right out of there so it wouldn't be a target for his instability/frustration/lack of meds.

Anyway, we never did set the proportioning valve/compensator/bias valve or whatever you want to call it & I was wondering if the adjuster was a universal thing - i.e. clockwise to increase front/anti-clockwise to increase rear or vice versa, or would that be subject to however he fitted it?

The rollers that the brakes are tested on are part of a security protected program at the test station which can only be operated if a valid test is underway. This is neither here nor there, but it does mean I'll need to find some other way of checking my brake balance after I've adjusted it.

Any help or pointers would be gratefully appreciated.

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Old 11-18-2009, 04:16 PM
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Be sure the rear brakes are properly adjusted and in good condition. The drums should be smooth w/o grooving and the adjuster mechanism should work freely, especially if the rears are self-adjusting. No oil or grease on the shoes or drums.

The normal application for a line lock, is to lock the front brakes solidly on, w/o actually continuing to hold the brake pedal down. It is used to be able to spin the rears to heat the tires up before racing (I'm sure you already know this, but just in case). The brakes are then released via the solenoid. A line lock wouldn't work as a proportioning valve.

If there is a proportioning valve besides the line lock, you can test for the brake bias front to rear if you go to a secluded area w/no traffic or other obstacles, pedestrians, wild horses, etc.

A sandy surface is helpful here, both because it allows brake lock-up w/o a lot of drama, and because the tell tale marks left by the tires will be easily seen.

Make a baseline stop or two, checking to see if the rears are locking, and if so, how much after the fronts and at what pedal effort. Keep adding rear bias until you get rear lock up after the fronts- the exact amount is subject to load and tire/road conditions, weather, etc. You don't want the rears to lock up with the fronts at the same time in this test- that would cause premature lock-up of the rear brakes (and a possible loss of control) due to the weight transfer that occurs in real world conditions.

Some trucks were equipped w/a load sensing device that accounted for weight in the back of the truck. When the load was light, the bias was decreased and vice versa.

You also want to see that each side (both front and rear) are locking at the same time. Hopefully after this you will have a feel for adjusting the rear bias enough without going too far, so you can pass muster.

Good luck.
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Old 11-18-2009, 04:33 PM
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Many thanks for the reply.

It seems it's as I figured - I'm gonna have to take it somewhere dusty to try it out.

It'll be a case of trial & error, since I won't know whether I'm increasing or decreasing the rear brakes until I test each adjustment.

The rear brakes are fine, they're just not applying as much as they should.




Have one of these on me...

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Old 11-18-2009, 05:28 PM
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I Want One Too !!!!!!

Hi Job-Rated,i want you to send me one (or 2,or 3 or a case) i like english beer too..........
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Old 11-19-2009, 02:57 AM
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I'd gladly oblige but English beer doesn't travel too well.

If you're ever in my neck of the woods, I'll treat you to a 'Bitter & Twisted' - a simply wonderful drop of ale...
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Old 11-19-2009, 03:40 AM
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Quote:
Originally Posted by Job~Rated
I'd gladly oblige but English beer doesn't travel too well.

If you're ever in my neck of the woods, I'll treat you to a 'Bitter & Twisted' - a simply wonderful drop of ale...
"Bitter & Twisted", ... sounds like an old girlfriend
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Old 11-19-2009, 04:40 AM
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Tastes just as good, too!
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Old 11-19-2009, 06:34 AM
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Originally Posted by Job~Rated
Tastes just as good, too!
HA!! Good 'un.
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