installing hydraulic handbrake

[Stranger]

Background: Car is converted to rwd, and is in the process of being outfitted to run in some local drift events. Blah blah blah. 99.5 a4 avant 1.8t

So can anyone fluent in how our abs works can you chime in?

I have 3 options for plumbing in a hydraulic handbrake.

1- totally delete abs and run front and rear straight from master cylinder and figure out how to bias. (most work, lose abs, potential for failure skyrockets)
2- Buy a 2 cylinder hydraulic handbrake (Expensive, only one available, twice as many failure points, too big to fit as a vertical lever)
3- Merge rear brake lines to one going into handbrake out into one splitting back to each brake. (easiest and simplest option)



Now the question with option 3 is will abs still function at all? The front should modulate correctly I'm assuming but what about with the rear since the lines are merged. Is our abs system FR RR / FL RL or FL RL / RR RL? I'm not opposed to totally deleting abs but all the line work required is kinda of a pain in the ass. Not to mention being just rwd not having abs is going to kind of suck in inclement weather.


discuss

[walky_talky20]

Is the rear diff welded?

[Stranger]

Not yet, just the center right now. I messaged tryol sport to see if there drift car had a welded rear diff but no answer so far. For now the rear just has the apikol mount with bushings. funds will dictate whether the rear gets welded or an lsd since the car will still be street driven in the summer.

Walky. Can you comment out how our abs is set up? Will the front still work if the rears are joined after the abs block?

[walky_talky20]

As far as I know, the system is Front/Rear out of the master. That bit doesn't actually matter so much because the ABS is definitely a 4-channel system. Each wheel has a separate output.

With a hydro handbrake, your ABS will definitely not work while you are pulling on the handle. That's pretty obvious, though (and that's the way you want it anyway). The only thing you can worry about is making sure the ABS works as normal whenever you *aren't* pulling on the handle. To keep it all working properly (including Electronic Differential Lock, as well as ABS) you must retain 4 channels. That means you must use a dual Master Cylinder hand brake:
http://www.ebay.com/itm/Universal-Hy...52b9da&vxp=mtr
http://www.rallynuts.com/motorsport-...OBPHBB0A3.html
http://ksportusa.com/b2c/proddetail.php?prod=HH0004

The designs are pretty simple, so you could definitely make your own with a little fabrication.

Personally, I think I would want to completely disable any and all ABS operation while I was drifting. I don't want the EDL putting on the brakes while I'm trying to spin the rears, etc. That's up to you.

The implementation of these hydro e-brakes is something of a controversy in the drifting community. Many organizations do not allow them to be plumbed into the service brakes. The reason being that while you are pulling on the handle, the foot brake no longer works the rears. The rules state that the foot brake must always, under all circumstances, put pressure to all 4 wheels. This is obviously not possible with a hydro hand brake in-line. So you will see most (all?) pro drifters now running 2 pairs of calipers out back. The regular service brakes, and usually some sort of small Honda front calipers mounted back there using some custom brackets.

For someone who knows what they are doing, I don't really see this a major safety issue. I think it's more of a legal thing for the pro organizations.

[terraflata]

As far as I know, the system is Front/Rear out of the master. That bit doesn't actually matter so much because the ABS is definitely a 4-channel system. Each wheel has a separate output.

With a hydro handbrake, your ABS will definitely not work while you are pulling on the handle. That's pretty obvious, though (and that's the way you want it anyway). The only thing you can worry about is making sure the ABS works as normal whenever you *aren't* pulling on the handle. To keep it all working properly (including Electronic Differential Lock, as well as ABS) you must retain 4 channels. That means you must use a dual Master Cylinder hand brake:
http://www.ebay.com/itm/Universal-Hy...52b9da&vxp=mtr
http://www.rallynuts.com/motorsport-...OBPHBB0A3.html
http://ksportusa.com/b2c/proddetail.php?prod=HH0004

The designs are pretty simple, so you could definitely make your own with a little fabrication.

Personally, I think I would want to completely disable any and all ABS operation while I was drifting. I don't want the EDL putting on the brakes while I'm trying to spin the rears, etc. That's up to you.

The implementation of these hydro e-brakes is something of a controversy in the drifting community. Many organizations do not allow them to be plumbed into the service brakes. The reason being that while you are pulling on the handle, the foot brake no longer works the rears. The rules state that the foot brake must always, under all circumstances, put pressure to all 4 wheels. This is obviously not possible with a hydro hand brake in-line. So you will see most (all?) pro drifters now running 2 pairs of calipers out back. The regular service brakes, and usually some sort of small Honda front calipers mounted back there using some custom brackets.

For someone who knows what they are doing, I don't really see this a major safety issue. I think it's more of a legal thing for the pro organizations.

What he said. Run two calipers. Most performance brakes that are custom don't have an E-Brake anyways, so the option has always been an additional caliper to support it. Do it, post it and tell us what you think. BTW a lot of calipers out there for just E-Braking (R8, DOdge Viper, ETC) try looking into those for options.

[walky_talky20]

^Wait, that's not what I said. lol