what is this?

[Lethal_Locky]

Hi all

just wondering what this thing is attached to the brake master cyclinder assembly....some sort of adjustment. its attached to a bracket to the upper strut bar. is it standard? what does it do?

clicky

also i have noticed a sudden drop if fuel efficiency, from like 450km/tank to around 380km/tank. nothing has changed (i.e driving style, mods) and just had a recent service. I have noticed that petrol fumes/heat haze can be seen being emitted from the fuel cap in my drivers mirror whilst driving....this can't be good. I have also been told that the fuel cap cover (the unscrewable one) is not standard.

could it be simply a problem of the fuel cap not fitting correctly, or is it a more serious problem.

any info would be muchly appriciated

p.s. stock as a rock manual 95 r33 gtst

kthanxbye

[neil_se]

Looks like a brake cylinder brace. I'm not really sure what they do though.

[red900ss]

Looks like a master cylinder brace, though it's strange to have the threaded bit with the locknuts.

Does it extend through the blue anodised bit into the cylinder? If so it's some kind of weird assed bias adjuster. Not standard whatever it is.

[blind_elk]

Yes, I'd have to agree - a brake cylinder brace. It's purpose is to stop the master cylinder moving forwards during heavy brake applications.

[ferni]

as for the fuel thing you could try reseting your ECU?

running rich isn't a bad thing - anyone who has mods generally runs thier car rich - less chance of combustion etc..

[Silver-Arrowz]

It's a brake master cylinder brace alright. The thread there is so you can move the blue bit back and forth and adjust it accordingly.

[wreckedhead]

dont worry about what it is if it doesnt dother you while you drive , dont touch it, if its worked till now, then its fine.

[Lethal_Locky]

thanks for the replys. yep a brake cylinder brace makes perfect sense. i just uscrewed that thread and the bluey anodised bit is like a cradle. cool btw, it is a nismo strut brace, but i have never seen the brake brace b4.

the fuel thing still has me worried. it seems like the fuel cap doesn't fit right.

does anyone, or could anyone take a photo of the stock fuel cap for me, so i can see if mine is original or not. It has nissan written on it, but now i'm not sure because i have been told that it isn't a skyline cap.

but i will try resetting the ecu later this weekend and see if it does anything

thanks again for the help, muchly appriciated

[crooser]

The fuel filler opening is changed as part of compliance. Many say that depending on who complies them, some use a crappy sealant that disolves over time. This could explain the vapour you can smell/see. Worth a look.

re the bad fuel economy, was a change of fuel filter,air filter,plugs and a reset of the factory ecu all done in the recent service you mentioned?

[Lethal_Locky]

ok i will check out the cap situation more. Is it possible to buy a new replacement? or shall i just search wreckers?

re the service, it was just a complete oil change everywhere, a lube up and a general check to get the 100% health tick. nothing needed changing so we didn't change them.

[Al]

A faulty oxygen sensor could also make your fuel economy go up the shit.

But definitaly get the vapour out of fuel cap checked out by a qualified mechanic.

Put your ecu in diagnostic mode and see if it picks up anything. Do a search to fing out how this is done, sorry never did it myself.

[BHDave]

The brace is definatly a custom job looking at the way it's tacked onto the strut brace bracket. Even the way the bracket is shaped makes me think that is custom to suit the master cylinder brace. Weird.

As for the fuel issues you may want to swap the cap over for starters to make sure that it's not stuck open and venting all the time.

Also check your charcoal canister (black cylinder on the passenger side front corner of the engine bay) as thats there to absorb the petrol smell, and the lines running to it. You may have a blockage somewhere that is causing pressure to build up in the tank and vent from there rather than running through the canister.

Your reduced fuel economy has got me stuffed though