How to: Supra MA70 rear discs to Hilux

[Robbos_Toyotas]

pete - you dont need any more unions! they are all on the car already, they just need re-positioning....

[infotechplus]

pete - you dont need any more unions! they are all on the car already, they just need re-positioning....

My understanding was that I needed the 3 way off the MA70 because it acts as a proportioning valve. If not, no big deal. I noticed there are two unions on the driver's side frame.

Here's the Hilux (RN85R, built Nov. 1988) brake setup:



Note that the front outlet from the master cylinder controls the passenger side front, the driver's side front and the rear (through the Load Proportioning Valve or LPV). The rear outlet also goes to the rear axle (also through the LPV).

In the first photo we see the RN85R master cylinder:



The front outlet goes down to the three way union below the MC and the rear outlet spirals down to the two way union (located on the driver's side frame behind the three way union.)





Here are the two unions mentioned above:



On the three way, the front outlet goes to the driver's side brake. The rear outlet goes along the Lux's frame to the rear. On the two way, it goes straight to the rear.

Both lines meet up in the green union mounted on the rear frame.





The top outlet feeds down to another three way union, which sends a line out to the Passenger Side Rear and Driver's Side Rear.



Cheers,

Peter

[Robbos_Toyotas]

sorry dude when you meant you need a 3 way union i thought u were referring to the one in your 4th pic. You DO still need the brake bias valve thingy i was telling you about tho...the green thing i had pics of i sent to you...

[1JZ~lux]

mmm... I missed that extra line running to the back when I looked at mine. How would this extra line from the front brakes effect the bias? I was also planning on removing the load sensing when I do my suspension and get the GVM reduced, how would this effect the bias?

[Screamn_Sleeka]

Just thought id share my findings, it seems that 90's tarago's share the MA70 rear discs.

[Herus]

how much proof do you have?

measurements, etc? would the backing plate be the same?

I should be able to get tarago rear disks easy as.

Thanks

Andrew

[SillyCarS]

that diagram would look a whole lot better with a line locker

[Screamn_Sleeka]

Herus, toyota part number.

Cant confirm the backing plate, but if it is different it will just need to be modified differently to to the MA70 one.

[Herus]

Hm...

Sneaky little toyota..

Ill look into it this weekend when im at the wreckers..

Thanks

Herus

[infotechplus]

Just thought id share my findings, it seems that 90's tarago's share the MA70 rear discs.

I'm going up to Pick'n'Payless this morning. I'll do a quick measure up and visual on the Taragos and report back.

Cheers,

Peter

[Herus]

I'm going up to Pick'n'Payless this morning. I'll do a quick measure up and visual on the Taragos and report back.

Cheers,

Peter

Sweet,

Thanks Peter

Andrew

[infotechplus]

Sweet,

Thanks Peter

Andrew

Sorry Andrew but there were no 90's Taragos to check out at Pick'n'Payless. Early ones (1980's) were certainly significantly different and unusable.

Cheers,

Peter

[Herus]

Doh! Thanks for having a look for me anyway!

Sleeka, Can you link me to where you got all the details from?

Id like to have a look at a few things.

Thanks

Andrew

[infotechplus]

This afternoon I began installing the MA70 booster and master cylinder.

I ordered a new gasket from Castle Hill Toyota, and first they forgot to order it, then they failed to deliver it and eventually I had to go up there and pick it up. To compensate me they gave me a TRD sticker.

This afternoon I began installing the MA70 booster and master cylinder.

I ordered a new gasket from Castle Hill Toyota, and first they forgot to order it, then they failed to deliver it and eventually I had to go up there and pick it up. To compensate me they gave me a TRD sticker.



I removed all the brake lines off the original Hilux master cylinder, and undid the four nuts holding it on, and then undid the other four inside the cabin to remove the booster. The only other attachment is a clevis pin and spring clip. Took about 10 minutes.

Here's the firewall ready to accept the new parts:



Here's the inside showing the four holes the MA70 booster has to fit through:



The first problem is that the original Hilux booster has quite long studs, longer than the MA70 booster:





The Hilux booster is held proud of the firewall by an aluminium spacer about 20mm thick. The MA70 does not have enough thread inside the firewall with this spacer. So I removed about 5mm off it and refitted the booster. Three studs now have enough thread to put the nuts back on.



The problem now is that the spacer will need to be deleted altogether as the brake light is permanently on due to the break in contact of the stoplight. This means material will need to be removed from the hole in the firewall as there is sufficient interference to not let the MA70 booster go through properly.

This photo shows the gap that must be closed:



This is with the horseshoe fitting at its most extended length.

The MA70 booster and master cylinder fitted up:







So tomorrow I will have to remove everything again, and take the spacer out, and widen the opening in the firewall. This should be enough to bridge the stoplight gap, and allow all four studs to have their nuts fitted.

Cheers,

Peter

So tomorrow I will have to remove everything again, and take the spacer out, and widen the opening in the firewall. This should be enough to bridge the stoplight gap, and allow all four studs to have their nuts fitted.

Cheers,

Peter

[infotechplus]

Whilst I was out at Pick'n'Payless I picked up a couple of items. Namely, the front and rear unions of the MA70 that originally donated my rear calipers and discs. I thought I might be able to use them at some time when re-routing the brake lines.



The left one is the rear union that sits just near the fuel tank. The right one is down by the driver's side guard in the engine bay.

This multi-union is off an MX83 Cressida:





It feeds both front and rear brake lines from just under the master cylinder. It mounts to the guard via two bolts.

Cheers,

Peter