North American Turbocoupe Organization

SVO brake Master cylinder for rear disc swap on 86
RDOG Offline
Posting Freak
Can I just use a 86 TC brake mastercylinder on my 86 TC to run a 88 TC rear disc setup?
1986 Turbo Coupe. Boport StageIII head, Boport 2.1, Performance Techniques 50 trim hybird, StageII.63, stinger 3" exhaust, Phenolic spacer, Boglog header,NPR FMIC intercooler setup, kirban fpr, bigrmotorsports fuel rail, diablo water meth kit, CAI, remote mount TFI, CHE rear adj control arms, MAC girdle, 8.8 rear disc, aluminum drive shaft, H&R lowerings springs Tbird Turbo Specific, y MAS!!

PsRumors Offline
i know it is old but anyone?

SVO master cylinder and proportioning valve work?
'83 TC - bone stock
'84 GT Turbo

Pete D Offline
The stock 86 TC MC supposidly won't move enough fluid for rear disks. The SVO MC is one way to go.

Pete Dunham


Mike C Offline
Senior Member
Also the residual pressure in the Drum brake master cylinder is different. There are a load of options, depending on the brake booster and the Master cylinder bores. Cool cats is a good read. But at the end of the day any M/C from a dual disc setup with a decent fluid capacity will work. The larger the M/C bore the more foot pressure required to stop!
Mike C
86 5 speed TC black with MS spats and spoiler since 88, 3.73 8.8 since 89. Fresh rebuild at 240K with new Racer Walsh roller cam, 88 hood. All 3" exhaust w/3" performance cat. 13" Cobra brakes,SFC, Max/Motorsport C/C plates,adjustable lower control arms w/ double adjustable uppers. Konis & Eibachs.

EricCoolCats Offline
As mentioned, any rear disc m/c will work. An old trick was to use a Lincoln Versailles m/c, as that car was set up for rear discs. Since the 1983-86 m/c on the Turbo Coupe/XR7 were identical to those on other drum brake models, it's not set up for the proper metering for rear discs.

I am currently running an '84 Crown Vic police car m/c on the convertible (which may or may not cross reference with the SVO m/c--IIRC it did at the time). The fluid reserviors are about 20-30% larger than stock, which is what you need, but the bore is also slightly larger. The pedal effort was high with 11" front brakes (Mark VII calipers) but has dramatically improved with the Cobra 13" brake setup. All this with the stock booster too. If I were to have stayed with the 11" brakes I'd have swapped in the 1994-95 Cobra booster, but for the current system my bone-stock 22-year-old booster is working like a charm.

For the prop valve there are also a few ways to go. The preferred method is to gut the stock prop valve, put in the FRPP fixed plug (M-2450-A), and install an adjustable valve inline. This way you can set up your front/rear bias to your liking. This works great for the older cars with the cast iron m/c and the 2-line setup. Alternately, you could use a prop valve from a stock Ford rear disc car (Versailles, SVO, 1987-88 Turbo Coupe, possibly Mark VII). I have had people report that they work just fine. Obviously you lose the adjustability but otherwise it should be okay. You just may have to redo the front brake lines, as most of the prop valves from 1987-on were made for the 3-line system (front d/s, front p/s, rear). In this case the older you go, the better off you'll be, so look for the SVO or Versailles (maybe even Continental) prop valve made for the 2-line (front, rear) system and you're good to go.
The 1983-88 Mercury Cougar

motormenace Offline
Senior Member
If you use the SVO master cylinder, I recommend using the 73mm SVO calipers also. I did the same thing, but the brake pedal was very firm with the stock 60mm calipers. Either SVO or TC prop valve is fine.
86 turbo coupe (14.12 at 15 psi. sleeper) *gone* you have a V8...isn't that cute...

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