help with brakes needed

Help needed & advice given..try here
old git
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Re: help with brakes needed

Post by old git » Mon May 27, 2019 12:47 pm

hi burkie did not realise you had a thread,so answered in the chat box,So if your master cylinder is mounted lower than your brakes you can fit a residual pressure valve which keeps 2psi in the line on the brake side for disk brakes and 10psi for drum brakes, if you want i can post a picture of one fitted to mine this may not be a full answer to your problem but will definitely help.The valves are made by willwood and you should contact THINK AUTOMOTIVE really helpful people.

Kawazuki
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Re: help with brakes needed

Post by Kawazuki » Mon May 27, 2019 4:41 pm

I've heard of those valves being used with discs but never drums? The disc pistons often retract a bit leading to a 'long' pedal but with drums the slack can be adjusted out so shouldn't need a valve and surely 10psi would result in shoes dragging?

old git
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Re: help with brakes needed

Post by old git » Mon May 27, 2019 6:14 pm

just looked at paperwork and reads 2lb valve for disks and 10lb valve for drums and not psi ooops

adrianbt
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Re: help with brakes needed

Post by adrianbt » Sat Jun 15, 2019 1:40 pm

Wonder if anyone could offer some help in my direction about brakes.

I've got a VW rear end and the brakes are rock hard. It did have a servo fitted by the previous owner and they sort of worked.

So I've fitted:
New Master Cylinder (land rover single system)
New 2.3:1 servo
New brake cylinders
Added a new vacuum pump

And they are still b....y rock hard.

I'm losing the will to live trying to figure out what is causing it.

any ideas would be really a great help
Cheers
adrian

gorbee01279
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Re: help with brakes needed

Post by gorbee01279 » Sat Jun 15, 2019 2:29 pm

Check your master cylinder bore,if it's 3/4" it's to big go down to 5/8"bore if your using original 19mm bore slave cylinders.Had same problem with mine better now with the smaller bore master.

Deep Diver
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Re: help with brakes needed

Post by Deep Diver » Sat Jun 15, 2019 2:36 pm

Also check out the ratio of brake lever
I tried to be normal once, worst two minutes of my life.

Barry the cantankerous old goat. :poke:

adrianbt
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Re: help with brakes needed

Post by adrianbt » Sat Jun 15, 2019 5:32 pm

Well............. it appears to be the angle of the dangle on the pedal. Never thought of looking at that and actually didn't think that it could make that much of a difference...... but wow.....

The original ratio was 2.8:1, so out came the drill and now have a 7:1 ratio which really does make a massive improvement.

Now there is just a pull to the left so there is definitely an imbalance and will need to adjust the right side drum. I guess that it is just adjust a bit and test as don't have the luxury of a friendly garage with a brake testing setup. I think I'll re-bleed the system and then have a look.

Thanks for your help.
mongrel-1.jpg
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Deep Diver
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Re: help with brakes needed

Post by Deep Diver » Sat Jun 15, 2019 6:07 pm

You'll find that you don't need the servo now
I tried to be normal once, worst two minutes of my life.

Barry the cantankerous old goat. :poke:

jinjachin
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Re: help with brakes needed

Post by jinjachin » Sat Jun 15, 2019 6:21 pm

well done brakes on trikes are a pain it took me an age to get mine right . nice trike by the way

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