Hi guys,

 

Spent most of today replacing the front discs and pads on the zed exactly as on the tt.net website and got through it all okay But when i tried the car to test them the pedal just seems to go right to the floor while only applying minimal braking. if you pump it a few times it gives more pressure but just drops away again if you dont touch the pedal for a bit.

 

pretty sure i didnt get any air in but could be wrong and positive the master cylinder is okay because they worked fine before hand but just squeaked cause the pads were shot.

Does it sound like it needs bleeding? will i have to do this from the caliper or the abs unit?

 

Any ideas ?

 

any help appreciated!

 

Thanks

Nick

I would start with bleeding them, you have to do each caliper in a certain order and the ABS unit.

Heres the order to do them in Left rear, right front, left front, right rear, ABS actuator front, ABS actuator rear

Okay great. i think i better start with that!

 

do you know if air would give that feeling with the pedal?

 

havent the first clue on how to bleed brakes. is there any special tools needed?

 

Cheers

nick

You need a 10mm spanner, a proper spanner can be bought but there is no real need, air in the system will do that, when I did my new pads and discs the master cylinder gave up and had the same symptons as yours but best to start with the cheapest easiest options.

cheaper the better sounds good to me!

 

 

is there a guide to doing it anywhere? is the master cylinder hard to find?

 

Havent had the car long and already feel like there is gonna be a few challenges ahead!

 

Cheers for the help

This should tell you all you need to know http://www.ttzd.com/tech/linestech.html

Master cylinder is in engine bay at back on the drivers side, usually has a yellow or black cap on it.

Nick,

 

I am suspecting that when you changed the pads in order to get them in the caliper you pushed back the pistons..right? I also suspect you did this without opening the bleed nipple and without putting a line lock on?

 

This is a very common mistake, if in fact you did do it this way the resulting poor pedal is due to the excess pressure been forced back in to the master cylinder and past the seals, often the piston seals will flip backwards and now you have a poor pedal feel that will creep to the floor under constant pressure.

 

You can try to right the wrong if you like by bleeding as mentioned by others put with a pressure bleeder or with some very heavy pushes on the pedal.

 

If all this fails ( most likely) then you will need to remove the cylinder and replace the seals with a repair kit which are available from Nissan and are around £50.

 

As a warning to any other members changing their brake pads in future, do not force pressure back up the master cylinder open the bleeds and use a line lock, this will prevent the problem occurring.

 

Jeff TT

Hi Jeff

Not quite sure what you mean here and don't wana start another fight over petty stuff. Pushing the pistons back in a timely fashion shouldn't affect the master cylinder seals at all ( if you are able to return the wheel cylinders at a speed to cause this "I'm not gonna mess with ya as you must be built like a house:) ) the fluid will simply bypass the seal and fill the master cylinder res unit. Unless the pedal is being pushed at the time of course. It's gen the first .5mm that closes this off . Both rear brake calipers are on the same circuit with a "T" piece check the manual. Zed has a mental brake system as it's all driven from the off side rear ABS unit apart from the drivers master cylinder of course. But it stops :)

 

Craig

Look forward to further comments

thanks for the comments guys.

no i didnt open any bleed valves when i pushed the pistons back so maybe that could be where i went wrong. im fearing the worst now! car is a 92 but the cylinder unit looks brand new when i had a poke around last night. hope i havent popped a new one! :headvswal

 

 

[

Just to shed a little bit more light and throw in another problem... i had fitted a set of black diamond discs and predator pads all seemed to be great with them i had more stopping power and the were fitted just by easing calipers back they were fitted by a garage so i presumed they knew what they were doing anywhoo all was fine until i raced a 200sx around town givin it wellie and on and off brakes then i hit about a ton and needed to stop on a sixpence..... slammed on the brakes went from 100mph to about 40mph in 20feet locked the wheels up and my brakes just faded i thought they were just hot but since then i have changed the pads where glazed and i have crap brakes again especially when cold when they warm up they improve slightly have i cooked the brake fluid :confused: :confused:

Hi Jeff

Not quite sure what you mean here and don't wana start another fight over petty stuff. Pushing the pistons back in a timely fashion shouldn't affect the master cylinder seals at all ( if you are able to return the wheel cylinders at a speed to cause this "I'm not gonna mess with ya as you must be built like a house:) ) the fluid will simply bypass the seal and fill the master cylinder res unit. Unless the pedal is being pushed at the time of course. It's gen the first .5mm that closes this off . Both rear brake calipers are on the same circuit with a "T" piece check the manual. Zed has a mental brake system as it's all driven from the off side rear ABS unit apart from the drivers master cylinder of course. But it stops :)

 

Craig

Look forward to further comments

Spot on, change at least 3-4 sets of pads a week and have never needed to open the bleed nipple etc mind you the use of proper caliper piston clamps instead of screwdrivers and lever bars does help

 

Ryan

Spot on, change at least 3-4 sets of pads a week and have never needed to open the bleed nipple etc mind you the use of proper caliper piston clamps instead of screwdrivers and lever bars does help

 

Ryan

 

See peeps I do know what I'm talking about :)

 

Hi Ryan got the HICAS arm today and is now fitted "set the backend up to the angles ya gave me feels like a new motor (Rem I'd never driven the car without a woobly back end) :) " Thanks.. Ryan "TOP BLOKE!! Trust this man he knows what he's talking about"

P.s Ya forgot my front brake pad pin spring thing you where gona bung in the bag ner mind I'll survive still running some spring thing I found in a tub under the bench the pad pins ain't gona escape :)

Mmm... very common misconception both of you have there..... that it has worked ok in the past so it must be right.

 

I suppose everyone has there own standards and if your both happy with forcing potentially dirty and/or contaminated fluid back into the master cylinder and past the seals then that`s your decision to risk it, personally I take no risks whatsoever with the braking system of any car let alone a 300 bhp sports car

 

Seriously, taking the extra time to do do it correctly always pays dividends where brakes are concerned.

 

Jeff TT

 

PS.

"Quoted by Ryan "change at least 3-4 sets of pads a week

 

Come on matey keep up...jeez though you were the LARGEST specialist in the UK............. and that`s your own quote!

Mmm... very common misconception both of you have there..... that it has worked ok in the past so it must be right.

 

I suppose everyone has there own standards and if your both happy with forcing potentially dirty and/or contaminated fluid back into the master cylinder and past the seals then that`s your decision to risk it, personally I take no risks whatsoever with the braking system of any car let alone a 300 bhp sports car

 

Seriously, taking the extra time to do do it correctly always pays dividends where brakes are concerned.

 

Jeff TT

 

PS.

"Quoted by Ryan "change at least 3-4 sets of pads a week

 

Come on matey keep up...jeez though you were the LARGEST specialist in the UK............. and that`s your own quote!

 

Wind your neck in there's a good lad ............Standards and Zedworld in the same sentance LMFAO :rofl: :rofl: :rofl:

 

I don't me to be funny jeff but if you were to spend as much time on your customer service and quality of work as you do making trouble on the forum i think the forum members and your customers would be happy

Don`t mince you words, say what you mean, get it off ya chest you know want to. :D

 

Quoted by Ryan: Standards and Zedworld in the same sentance LMFAO

 

Ouch that hurts, and Ryan I thought we such good mates.

 

You need to open a window and get some air matey, seriously you are loosing it!!

 

 

Jeff TT

 

 

 

NOT EDITED BY Jeff TT TODAY OR EVER

Don`t mince you words, say what you mean, get it off ya chest you know want to. :D

 

Quoted by Ryan: Standards and Zedworld in the same sentance LMFAO

 

Ouch that hurts, and Ryan I thought we such good mates.

 

You need to open a window and get some air matey, seriously you are loosing it!!

 

 

Jeff TT

 

 

 

NOT EDITED BY Jeff TT TODAY OR EVER

 

 

actualy i've always been told NEVER to open the nipples, as a) risk of air getting in the system. b) break fluid on the pads will **** them same with the disk. the onlt time you do that is if a piston wont go back

 

I got that information from my dad who was a trained mechanic and engineer for 25 years.

 

 

http://www.300zx.co.uk/cgi-bin/manual.cgi?list=br&dir=&config=&refresh=&direction=forward&scale=0&cycle=off&slide=12&design=default&total=56

 

 

Nissan's manual does not mention having to release the nipples for pad replacement either.

Ah for Fecks sake, here we go again.

 

 

Jeff, just call Ryan a coont and tell him to die and be done with it.

 

 

And Ryan tell Jeff he's a coont and to go die as well.

 

 

Really getting tired of all the sniping between Jeff and everyone else.

 

Jeff why do you have to try and make out everyone knows shit apart from you and that Zworld is the ONLY place in the known universe to take a Z to?

 

And why does everyone else try and make Jeff look like he is talking shit?

 

I know it’s a circle of shnidey comments that will never stop, cos as one person starts (normally Jeff) there will always be a response.

 

Well I'm gonna try and sort it now for everyone.

 

 

Jeff - grow up and just accept there are more places that know how to work on a Z than Zworld and bite your f*cking tongue in future.

 

Everyone else - If you don’t agree with Jeff (which is more often than not) just move the f*ck on and leave the bloke alone, believe it or not 90% of his first posts in a thread are trying to help members.

Ah for Fecks sake, here we go again.

 

 

Jeff, just call Ryan a coont and tell him to die and be done with it.

 

 

And Ryan tell Jeff he's a coont and to go die as well.

 

 

Really getting tired of all the sniping between Jeff and everyone else.

 

Jeff why do you have to try and make out everyone knows shit apart from you and that Zworld is the ONLY place in the known universe to take a Z to?

 

And why does everyone else try and make Jeff look like he is talking shit?

 

I know it’s a circle of shnidey comments that will never stop, cos as one person starts (normally Jeff) there will always be a response.

 

Well I'm gonna try and sort it now for everyone.

 

 

Jeff - grow up and just accept there are more places that know how to work on a Z than Zworld and bite your f*cking tongue in future.

 

Everyone else - If you don’t agree with Jeff (which is more often than not) just move the f*ck on and leave the bloke alone, believe it or not 90% of his first posts in a thread are trying to help members.

 

Well said by that man :)

Quoted by mtl "Well said by that man"

 

Oh I second that :D

 

Really guys take it easy, a bit of banter is ok, stops the place getting stale, and yes I do help people with tech questions where I can.

 

Quoted By Mike Groves: "actualy i've always been told NEVER to open the nipples, as a) risk of air getting in the system. b) break fluid on the pads will **** them same with the disk. the onlt time you do that is if a piston wont go back"

 

Absolutely correct! Sorry I did assume ( my fault) that peeps realised I meant putting a bleed tube on the nipple, as if not fluid will go everywhere and of course air could be taken in as once the pistons are fully back, but then always good practise to bleed the calipers when changing pads to remove the fluid closest to the hot end of the system.

 

 

Now off for some meditation

 

Jeff TT

"Quoted by Ryan "change at least 3-4 sets of pads a week

 

Come on matey keep up...jeez though you were the LARGEST specialist in the UK............. and that`s your own quote!

 

 

PMSL :rofl:

 

he is ;)

Quoted by Greg: "PMSL .........he is"

 

Erm...........and he operates from a mobile phone...........right?

 

Must remember.........limited liability company + mobile phone = Largest specialist...Mmm...special alright.

 

Jeff TT

 

Ps I hear there is a special offer this month 100 free text messages with every service

:rolleyes: :headvswal

takemetothepub.

 

I Know, I know, will stop it now. :x:

 

Jeff TT

well i been to zedworld 2 or 3 times and had no problems, in fact the car likes it there so much it keeps breaking so it can go back over lol