Thanks 5, is it ok if I call you that?  :o)
when you say "They" - do you mean later Sdubs, other Toyotas or other brands?
Who makes the Sdub m/c's? Toyota, Denso, Yamaha ,...? Maybe any from that maker might fit ...
 
Also, if I was going to remove the ABS system, now would be a good time to do it...
decisions, decisions.....
 
 
 
 
 

TwoDogs
This morning, the only place in the US that did not list the reco kit as Discontinued, sent me an email
to say they can't fulfill the order. So looks like I will be fitting an m/c from a different car.
 
 

 
Have you tried Amayama or Lithia Toyota parts? 
You'll need the correct part Toyota number for a reco kit for your year/model. 
 
Also could be a good idea to pull the M/C and check the bores before spending money on a reco kit.
 
 

Thanks Redd, checked Amayama and they appear to have it, so have placed the order. Cheaper than the US also.
Yes it would be a good idea to take the m/c out, but that takes the car off the road until completed.
 
 

 Amayama notified me that they cannot supply the m/c rebuild kit for the early m/c.
 So back to square 2... 
 Does anyone know for sure of a bolt on M/c (+/- booster) which will replace my 1990 ABS m/c with fat booster ?
 One more question, do I need to get under the carpet to replace the master cylinder (and poss the booster)?
 Because over Christmas/new year, I will be putting some sound proofing in. Was hoping to reco the m/c in that time
but now I think the brake upgrade won't be in time. (I don't know what to get yet :o)
 thanks for your help.

My understanding is you can get the later model M/C and booster and fit direct to your 90 model.
Few guys have mentioned that here.
Like what's been said make sure
You match abs with abs if you have abs.
Also the later model booster the vacuum valve is at the back. I remember reading is some where.
I have a 90 model fitted with 15/16 later model mr2.
Guys can correct me if I'm wrong

The later 15/16" M/C with thin booster should fit OK, but because of the width of your fat booster, the M/C pipes obviously won't. (may not matter if you get ABS bypass pipes made) 
You'll need to get under the carpet to replace the booster, but not to replace just the master cyl.
BTW, if you were to replace only the M/C, the push rod clearance between it and the booster should be checked in accordance with the service manual.
 

Ok, turns out that Redd's post on page 1 is what I need. The 15/16 (130.44906) is a direct replacement for the earlier 7/8" (130.44903). They are available from the US, but commonly, without the reservoir !! The reservoirs are different shapes, but maybe they fit onto each other's master cylinder ? Does anyone know if the original 1990 reservoir fits onto the 1993 master cyl ? (hoping to save a few $$).
 
Thanks Danti, you were saying the same master cyl.

Also make sure LHD fits RHD.
Have called the mr2 wrecker from melb.

I sms'd Josh a couple of days ago and have not had a response. My window for working on the car means I need to buy immed.

You tried anyone local, supercheap, repco, bursons, napa?

Where are you? If your local my usable original in chillin just over there on the shelf... Happy for you to borrow it to buy some time.