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Brakes Bedford J5 truck

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2 years 1 week ago #234346 by jon_d
Replied by jon_d on topic Brakes Bedford J5 truck
You'll always have problems with cast iron slaves. They rust and then the rubbers tear on the rust.
Master cylinders are the worst because the rubbers tear when the pedal is pressed to the floor during bleeding.

The only long term solution is stainless steel sleeves.
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2 years 1 week ago #234359 by Dutchman
Replied by Dutchman on topic Brakes Bedford J5 truck
One of the spare cylinders looks good, only a broken vent. No problem, we have a lathe and drill string.
The other one I'll put in a few new buses, no time right now.

And indeed, that iron rusts in front of you, so I'll keep an eye out for stainless steel. All right, after that the truck is as good as sold.

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2 years 6 days ago #234394 by Dutchman
Replied by Dutchman on topic Brakes Bedford J5 truck
I hope that I have more lucky with this sleeve, the bleeding nipple I have changed.
They tried to drill out in the past but the drill bit broke. What can I do...?

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2 years 6 days ago #234395 by Dutchman
Replied by Dutchman on topic Brakes Bedford J5 truck
leak test, Get what you see.
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2 years 5 days ago #234402 by cobbadog
Replied by cobbadog on topic Brakes Bedford J5 truck
You can with care remove broken drill bits. You can try LH drill bits in a hammer drill. Take it to a shop that does spark erosion which is the safest or make a tiny slotting chisel and start trying to shatter the broken bit.
Cheers Cobba & Cobbarette
Coopernook, The Centre of our Universe
Working on more play time.

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2 years 5 days ago #234403 by Morris
Replied by Morris on topic Brakes Bedford J5 truck
Bedford wheel cylinders should be relatively cheap and plentiful. I think it would be better to purchase new cylinders rather than spend mony and effort on old cylinders. Many car/truck spare parts shops in Britain will have new cylinders.
I have my shoulder to the wheel,
my nose to the grindstone,
I've put my best foot forward,
I've put my back into it,
I'm gritting my teeth,

Now I find I can't do any work in this position!
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2 years 5 days ago #234404 by Dutchman
Replied by Dutchman on topic Brakes Bedford J5 truck
Yes I know, but I live in Cape Verde and always problems with delivery out U.K. And not realy cheap! But the test shows good results, no leakage at this moment.
When I have time I can change the liner by expert machinery, I have now two for spare.
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1 year 11 months ago #234794 by Dutchman
Replied by Dutchman on topic Brakes Bedford J5 truck
I have brake pressure but I don't think it's enough. I tested the output pressure and it didn't get past 20 PSI, with no booster. This seems clearly on the low side, but the master brake cylinder is brand new.
What could be the cause?

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1 year 11 months ago #234796 by Lang
Replied by Lang on topic Brakes Bedford J5 truck
From a Girling brake repair manual:

For the same amount of force, the smaller the master cylinder, the greater the brake line pressure. Typical brake line pressures during a stop range from less than 800psi under "normal" conditions, to as much as 2000psi in a maximum effort.

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1 year 11 months ago - 1 year 11 months ago #234810 by Dutchman
Replied by Dutchman on topic Brakes Bedford J5 truck
Okay, but how do you explain that I only have 3 psi of pressure on bench testing.

Edit , 30 psi.
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Last edit: 1 year 11 months ago by Dutchman.

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