All Activity

That's really a risky maneuver. Overall length isn't as important as where the seals end up located when the cylinder is at rest. It would take a lot of study and investigation to know if it would work. Off the top of my head, looking at the rearmost piston (the one that the master cylinder pushes against), it has the seal in a different location than the original. The front piston is harder to analyze since it depends on where the seal will end up when the stop screw hits the lip of the piston. I'm just a guy with a keyboard, but I don't like it.

I only have one of the anomalies; the other four are outer shells for the hatch buttons

I would think if the OD's on the pistons are similar and both brake port holes are open at rest it would probably work...

Pretty cool. Odd that there's no fan shroud. Maybe because it doesn't get that hot in the U.K.? I've heard/read about the carb'ed European 260Z's, still around after EFI was introduced in the States. Never seen one.

I considered putting this in the ZX section but I thought the brake specific section would be better due to all the upgrade threads. I was wondering if anyone has tried or knows what happens if you try to use the pistons from a Tokico master cylinder rebuild kit in a Nabco MC. looking at them side by side they are clearly different, but only just. It make be hard to see in the photo but there are small differences in the measurements between them (dirty is Nabco, shiny/bagged is Tokico). The overall length looks the same. I haven’t measured them yet so can’t give you precise numbers.

You dont see these everyday in Australia; perhaps that is why it was imported from the UK (of all places!) Classic Throttle Shop1978 Datsun 260ZTime-capsule 260Z: low mileage, UK-delivered, tastefully upgraded, impeccably maintained, and beautifully documented throughout...

My daughter identified it using a Google function. Pretty cool... It's a Mopar antenna nut, not mine

If you have a caliper on the bench you might as well pop the piston out. Don't scratch the cylinder with the metal dust seal retaining ring. Images won't load but the Brake chapter describes it. Uploading Attachment... Uploading Attachment...

Not sure what you mean by two pieces. But if it's sitting on the bench then, obviously, there's an open port to atmosphere. No way to hold pressure. The piston should be easily moved by hand if the caliper is new or newly rebuilt and has had fluid in it. Or maybe not, re above. Where did you get the calipers? Might have a bad rebuild. Tight seals.

Cody's in Florida so I think he's safe. I just don't want to ship it back and then realize it's mine. But I don't recall any part like that

Most calipers I've worked couldn't be collapsed by hand and my hands are pretty strong. Have the calipers been rebuilt?

There is still fluid in that assembly. Did you blow everything out with compressed air?

Did you open the bleeder??

Haha, rabbit hole for sure. Sitting on the bench, with the caliper taken apart in 2 pieces, the brake pads "piston" ought to be able to compress without having to open the bleeder, correct? The fluid should go back the way it came from. Anyway, how hard should it be to move the piston? Can you compress it by hand or do you need a C clamp like I did?

Might want to ask Cody if he had a few parts he wanted to slide in on the Old man!😂😂

Brake line is quite different than the bleed system. IMO go back and do it by having that bleeder open. You might be going down a rabbit hole here.

I can't recall anything like that on my ride, so no idea.

Opening the bleeder when the brakes are stuck will tell you if the problem is pressure in the caliper or something else. If there's pressure in the caliper you can work your way back to the the MC fitting by fitting. Or work your way down, from the MC. First you need to know if it's hydraulic pressure or just mechanical sticking.

Probably worthwhile to read the Brake Chapter. It's not long. Well-illustrated.

But, don't overlook the brake pressure warning switch. Or the NP valve. Can't remember the car. (https://www.classiczcars.com/settings/signature/) It can get gummed up also. Uploading Attachment... Uploading Attachment...

No, I don't think so. But the line was disconnected. It has new rubber hoses, so don't think that's it. The hole in the master cylinder, that creates the pressure when you hit the brakes, is this also the return hole for the fluid?

The Nissan calipers use the rubber seal to retract the pistons. One common cause of sticking caliper pistons is collapsed rubber hoses. The MC can generate high pressure to push through the collapse but the rubber seal cannot to allow the pressure to release. It becomes like a check valve. On some cars the cause is a metal clamp on the hose that rustjacks and pinches the hose. But just degrading internal material can cause it also. I ould guess that a kink in the hose could cause it also.

Was the bleeder open when you tried to push the piston in?

I appreciate all the info. I removed one of the calipers and to compress the pistons, I needed to use a C clamp. Is this normal? Seems like they're awful hard to move. It takes alot of pressure to get them to move one way or the other. So when a guy applies the brakes, then releases the brakes, there's no spring to make the pads retract, they just kinda ride along the rotor. This drag is causing things to heat up and expand, making it tight. Some Fords have springs in the calipers to make them retract. I applied the brakes while the front end was lifted up, it wasn't heated up. After releasing the pedal, there was a more noticeable drag on the rotors. I pulled the master cylinder away from the master-vac, and there was no change. I don't think that's the issue.