DieselDoris 1947 CJ2a from Sweden - Page 11 - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 10-03-2019, 04:10 AM   #251 (permalink)
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Nice work there.
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Old 10-03-2019, 07:46 AM   #252 (permalink)
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Quote:
Originally Posted by pigge View Post
The callipers are from Volvo V70 2014 and newer.
Basically it's the same calliper on XC70 and S60 also, they are available with vented and solid discs and in different sizes (diameter)

It works with a motor that extend the piston, the return and adjustment of the piston is handled by the piston seal as a normal calliper.
The adjustment will work without the hydraulics attached.

On the Volvo the "clamping" force is controlled by the current.

In and out of the parking brake is controlled by two wires that just changes polarity.

It will work as emergency brake with damage/lost brake hoses.

I hope this answers you questions.
So if you turn the parking brake on, it motors in and clamps. Then if you turn power off, it stays clamped until you reverse power? Or does it require some power to hold? I assume it must hold with no power.

When you switch it on and the motor goes in, how long till it's at full brake? I guess it will stall at maximum clamping force? At that point, is it getting wires hot? Or is there some kind of clutch? Do you have it on a momentary contact switch?

Have you ever played with this system on the Volvo? Like if you're going 20 mph and switch it on, will it drag it down quick?

I'm really sorry for all the questions. I find this system interesting.
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Old 10-03-2019, 08:34 AM   #253 (permalink)
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Finally someone as crazy as me! I've had a prototype running around since EJS on an early jeep using a very similar VW/Audi electric ebrake caliper. So far it works sweet. The only issue is current draw when the motor is already clamped and you try to go the wrong way or use both motors at the same time. I will say they hold better than any ebrake I have seen yet!
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Old 10-03-2019, 11:10 AM   #254 (permalink)
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Quote:
Originally Posted by waterhorse View Post
So if you turn the parking brake on, it motors in and clamps. Then if you turn power off, it stays clamped until you reverse power? Or does it require some power to hold? I assume it must hold with no power.

When you switch it on and the motor goes in, how long till it's at full brake? I guess it will stall at maximum clamping force? At that point, is it getting wires hot? Or is there some kind of clutch? Do you have it on a momentary contact switch?

Have you ever played with this system on the Volvo? Like if you're going 20 mph and switch it on, will it drag it down quick?

I'm really sorry for all the questions. I find this system interesting.
It doesn't need any power to hold.
If you let the motor clamp until it stalls you will burn the motor



This is how I gone do it.

One of my friends is going to build me a small controller with the following functions.

When you activate the brake it will clamp until current X is reached (don't now the current yet, will use same current as doner.)

Realise the brake, it will power the motor back for X seconds, this will take some trail and error to find the sweet spot.

With current one way and time the other will make the system "self adjusting"
and keep the shortest possible time from no break till full break, which will be important for the steering break function.


I have two friend with the same calliper that "only" use a winch switch to activate/deactivate the break with and do it by the sound (you hear when it starts to clamp hard) and that works really good.
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Old 11-05-2019, 12:44 PM   #255 (permalink)
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For the moment I'm doing a lot of small stuff that takes forever to get done.
It's not showing so no pictures to show.

But now I really have to finish this build and start to tune it, I have signed up for a competition in May.
https://www.facebook.com/LodbrokeSweden/

It's going to be so much fun.

Last edited by pigge; 11-07-2019 at 03:30 PM.
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Old 11-07-2019, 03:33 PM   #256 (permalink)
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Today I can show two pictures of the rear radius arms with coil over and limit strap.

20191107_211505

20191107_211753
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Old 11-13-2019, 10:46 AM   #257 (permalink)
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I have started to build my skid plate.

20191112_213121
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