Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

All wheel disc conversion


  • Please log in to reply
15 replies to this topic

#1 YaBoyKingsley

YaBoyKingsley

    Advanced Member

  • Members
  • PipPipPip
  • 32 posts
  • chandler arizona

Posted 16 December 2017 - 03:24 PM

Hey guys I was wondering if I could convert my 78 Subaru Brat to all wheel disc to stop better and if I can get drilled and slotted discs that’s a bonus and some decent calipers
I’m putting 15” rims so as long as they fit inside I’m cool with it thanks for your help

#2 dfoyl

dfoyl

    USMB Regular

  • Members
  • 379 posts
  • Victoria, Australia

Posted 16 December 2017 - 03:51 PM

EA82 turbo rear's is the way to get rear discs, assuming you're sticking with 4 x 140. I have a friend in Nevada who has a set spare (4wd) if you're interested. They will fit under stock 13's.

 

Drilled and slotted I haven't seen for rear rotors, and wouldn't make any difference to performance (probably just chew through pads more quickly). Good quality pads and rotors are all you need.



#3 jono

jono

    Reader and writer

  • Members
  • 1,661 posts
  • Southern Hemisphere - AUS

Posted 16 December 2017 - 03:54 PM

If you overhaul your current standard brakes all round including caliper overhaul and all new hoses SLA ves and fluid you could be surprised how good it can be - I was! Nearly as good as when I put RX discs on my other ute rear. Think disc rear from ea82 four wheel drive will bolt up easy

#4 skishop69

skishop69

    If it ain't broke, you're not trying.

  • Members
  • 1,492 posts
  • Puyallup

Posted 16 December 2017 - 07:22 PM

Drilled and slotted rotors are a waste of money unless you are racing. They do absolutely nothing to increase braking on a daily driver. The holes and slots are there to dissipate heat from hard and constant braking faster than just vented rotors and yes, they go through pads faster. Just use the factory EA82 rear disc setup and the improvement will be day and night.


Edited by skishop69, 16 December 2017 - 07:22 PM.


#5 YaBoyKingsley

YaBoyKingsley

    Advanced Member

  • Members
  • PipPipPip
  • 32 posts
  • chandler arizona

Posted 16 December 2017 - 11:57 PM

What models has ea82s in them so I can get the parts of off one

#6 GeneralDisorder

GeneralDisorder

    Elite Master of the Subaru

  • Members
  • 21,618 posts
  • Portland

Posted 17 December 2017 - 03:33 AM

You need the complete rear disc setup from an EA82 4WD turbo model. These ONLY came on turbo models and are getting quite difficult to find. 1990 was the last year for them.

http://www.ultimates...ion-for-gen-1s/

GD

#7 Leeroy

Leeroy

    Old boxer tricks!

  • Members
  • 642 posts
  • Albury, NSW, Australia

Posted 17 December 2017 - 05:53 AM

To mount the rear disc brakes you need to grind some of the backing plate away (on the back) and cut a notch in the trailing arm so you can access one of the caliper bolts. All very easy to do. Ideally you will need to fit a proportioning valve too, either the original EA82 one or something aftermarket. Without one you will always lock the rear brakes in hard stops.



#8 Gloyale

Gloyale

    It's a sickness

  • Members
  • 10,553 posts
  • Corvallis, OR PNW

Posted 17 December 2017 - 01:03 PM

You need the complete rear disc setup from an EA82 4WD turbo model. These ONLY came on turbo models and are getting quite difficult to find. 1990 was the last year for them.

http://www.ultimates...ion-for-gen-1s/

GD

 

also 4cyl XT non-turbo



#9 Gloyale

Gloyale

    It's a sickness

  • Members
  • 10,553 posts
  • Corvallis, OR PNW

Posted 17 December 2017 - 01:05 PM

To mount the rear disc brakes you need to grind some of the backing plate away (on the back) and cut a notch in the trailing arm so you can access one of the caliper bolts. All very easy to do. Ideally you will need to fit a proportioning valve too, either the original EA82 one or something aftermarket. Without one you will always lock the rear brakes in hard stops.

 

neither of those things is essential

 

i put discs on my 84 wagon, no grinding anything, and no proportioning valve 

 

works great.



#10 GeneralDisorder

GeneralDisorder

    Elite Master of the Subaru

  • Members
  • 21,618 posts
  • Portland

Posted 17 December 2017 - 01:10 PM

neither of those things is essential

i put discs on my 84 wagon, no grinding anything, and no proportioning valve

works great.

First gen is not the same as second gen. Quite a bit of grinding is required for a 78.

And I can confirm that the prop valve is important for proper (straight) braking. My 86 Brat would swap ends easily till I added the prop valve.

GD

Edited by GeneralDisorder, 17 December 2017 - 01:10 PM.


#11 Loyale 2.7 Turbo

Loyale 2.7 Turbo

    The Mighty "BumbleBeast"

  • Members
  • 7,528 posts
  • Roatán, Honduras.

Posted 17 December 2017 - 04:00 PM

... And I can confirm that the prop valve is important for proper (straight) braking ...

 

Yes.

 

He can retrofit the one from an EA82.



#12 Loyale 2.7 Turbo

Loyale 2.7 Turbo

    The Mighty "BumbleBeast"

  • Members
  • 7,528 posts
  • Roatán, Honduras.

Posted 17 December 2017 - 04:05 PM


BumbleBeast%20Proportioning%20Valve.jpg



#13 Loyale 2.7 Turbo

Loyale 2.7 Turbo

    The Mighty "BumbleBeast"

  • Members
  • 7,528 posts
  • Roatán, Honduras.

Posted 17 December 2017 - 04:11 PM

GD has posted good info here, for retrofitting it on the EA81:

~► http://www.ultimates...ap/#entry460004
 

I mounted it using it's stock bracket from the EA82 to one of the mounting holes for the Brat's fuel pump shelf.... but the Brat's fuel pump is located in a different spot than the other EA81's... basically the bracket just has two holes, and you need to find a spot for it. The hard lines I used from the donor car - I pulled as many of the hard lines from the rear of the car as I could get - as well as the couplers and stuff. They bend real easily to fit wherever you decide to put the valve. I just routed the lines as best I could and zip-tied them. I'm sure with more time and effort you could make new lines, and do a more proffessional job of routing. I can get pics of mine if you like, but again - it's a Brat so it's different under there.

GD



#14 YaBoyKingsley

YaBoyKingsley

    Advanced Member

  • Members
  • PipPipPip
  • 32 posts
  • chandler arizona

Posted 17 December 2017 - 11:48 PM

You need the complete rear disc setup from an EA82 4WD turbo model. These ONLY came on turbo models and are getting quite difficult to find. 1990 was the last year for them.

http://www.ultimates...ion-for-gen-1s/

GD

Thanks for helping me with a lot of my questions I’ll be taking this route if I can

#15 dfoyl

dfoyl

    USMB Regular

  • Members
  • 379 posts
  • Victoria, Australia

Posted 18 December 2017 - 01:55 AM

Be careful with XT non-turbo as some are 2wd, which don't have the splines needed for 4wd.

 

As I said, I have a set in Nevada including good rotors if you're interested (otherwise I'll have them shipped down under).



#16 ferp420

ferp420

    im not a typer

  • Members
  • 1,052 posts
  • means dry lake california

Posted 18 December 2017 - 11:37 PM

The drilled and slotted rotors are good for oversized tires that need alot more force to stop or live in 5he mountains or run heavy loads i have yet to change my pads and they have been on the car for 3 years now towing boats other cars on 30" tires so the were factor shouldent be a consideration but they dont stop any beter than standerd rotors they just disipate the heat faster




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users