wiL87

91 NA Coupe with single piston front and solid rear disk
no mods

Did a T2/GXL brake upgrade front and back and this is what happened.
I couldn't get the brake lines off to replace with SS lines in the back so I left the regular lines for now...
The fronts.... oh dear. Took it off.

QUESTION - do the SS lines from mazda trix only go on the second part of the line? because that's the only reasonable place it would go by the looks of the line.

I put my rotors on and put the regular brake line in, but there is like 2 mm left from the thread that WON'T go into the calipers.

QUESTION - Do I need the T2/GXL brake lines? ALSO is it ok to compress the pistons one or two at a time and not all 4 at a time? My friend said it might freeze up so i don't know.

It's 7:04pm now and I really wanted to get this done, but I guess I need the different brake lines.

anyone have that part of the brake lines for T2/GXL brakes (ONLY if i need em')
and I guess it's better for me to replace my rear brake lines because the bolt is really stripped and I can't seem to get it off and put on my SS lines.

Josh18_2k

iTrader: (3)

you can compress the pistons however you feel like doing it. if you push only one or two tho, the others tend to come out, so you kinda have to push them all at the same time.
the SS lines only replace the flexible brake lines. no need to replace the hard lines as they dont flex under pressure.
"I put my rotors on and put the regular brake line in, but there is like 2 mm left from the thread that WON'T go into the calipers." - i dont really get what you're saying here. the line isnt threaded, theres a bolt that goes through it into the caliper, which shouldnt be any different between brake models.
get those SS lines in the rear somehow and it will all be OK :-)
btw, if you strip or round off the hard line in the back, dont worry about it, they can be replaced pretty cheaply at autozone. i didnt know this, so i was really paranoid abotu messing them up.

wiL87

Well you know how the front, there are two sections to the brake line. The thing that goes into the caliper in the front is too long. The thing where the line goes for the single piston caliper is deeper than the hole for the 4piston calipers.

wiL87

single piston front


four piston front



notice the gap with the 4piston caliper, where as there is no gap with the single piston.

jacked up brake lines in the rears that i haven't changed yet...





so yeah... is the hardlines the line that comes after the one connecting to the caliper?

wiL87

Maybe this noob should talk about his experience

I changed the rear calipers to Turbo calibers with SS lines from mazdatrix. Everything bolts in place, however the lines were a little hard due to the fact that they were stripped and rusted on.

THE FRONTS aren't done yet but I'll share.

We removed the calipers and rotor (to change both). The 4piston calipers DO bolt in place of the single piston caliper. HOWEVER the lines do NOT work. The pictures above show that the threaded section for the brake line does not completely go into the 4piston caliper. ALSO the fitting from the single piston caliper is different from the 4piston caliper fitting. Now the only thing I can think of is to change that brake line that goes DIRECTLY into the 4piston caliper.

There are two sections in the front. The SS lines do not connect directly to the caliper. That's it for now. I'll update later, hopefully other noobs will read this and understand it

Black91n/a

I actually just changed from the single piston front calipers to the 4 piston ones using new SS lines made for the single piston calipers (bought them before I decided to go 4 pot). The single piston lines work on the 4 piston calipers, but you need to not use the solid line that goes from the caliper to the strut (I didn't get any of those anyway). My lines went in about as far as the ones pictured above, and they sealed perfectly. There's a flare at the bottom of the hole that seals the line, it's not dependant on the compression of the line to the caliper at the bolt head part of the line.

wiL87

Wait... so I need to NOT use it.. meaning I CAN'T use that line that goes directly into the caliper? Or did you just phrase that wrong?

Spirit Rx-7

iTrader: (15)

for the TII 4piston caliper, you will need the hardlines for it, then the SS lines will connect to the hardline.

Pat McGroin

I MIGHT have a pair of 4 piston claiper hardlines, I would have to look for them.


But like that dumbass Spirit RX-7 said you need the hardline that connects to the calipers, then you can use the soft line, or get a braided line(which I would since you're in there anyway) and it connects to the body hardline that goes to the master cylinder.

For the rears if you get stainless braided lines you have no problems at all, just connect the braided line to the rear caliper and it goes directly to the body hardline.

Hope my pics help too.

wiL87

Thanks guys. I already bought the hardlines that connect to the 4piston calipers. SO i should be done by this week.

Black91n/a

Ok, to re-state what I said earlier.

If you have 4 piston calipers you can use one of two brake line setups.

One is the hard line from the caliper to the strut, then a soft line designed for the 4 piston calipers between that hard line and the body hard line.

The other is using a soft line designed for the single piston cars and connect it to the body hardline and connect it directly to the 4 piston caliper, NOT using the factory caliper to strut hard line. That's what I did, as I had single piston SS lines already, and I don't have any caliper hard lines. I've had no leaks with this setup, it fits just fine without any stretching or kinking or anything like that.