hey guys, I've got an 08 GTR - changed my front pads and fluid; can't get pressure to build up at all after bleeding system numerous times. This is what I've tried..
1) Master cylinder stripped, cleaned and washers renewed
2) Calipers split, cleaned and seals all renewed.
3) Hoses checked without calipers on to ensure fluid dripping through (no problem)
4) Hooked up ABS self diagnosis terminal to check for ABS errors. None appearing!
Anyone got any ideas as to what to do next?
cheers
forgive me if you have already done this , but when people are new to bleeding BIKE brakes they tend to do it wrong, its different to the car system where you pump, open nipple , let air out and pump and repeat.
you need to put your clear pipe on the nipple and leave the nipple open, then just keep pumping the lever and keep topping up the fluid resovoir, it make take 2 or 3 reservoir fulls of fluid , the air is a pig to get out , just keep pumping, topping up and eventually you will see it come through.
there are alternative methods , reverse bleeding, vacuum bleeding and also cable tie on the lever, leave over night and the air slowly rises up into the reservoir, but the first method has always worked fine for me.
let us know how you get on
Quote from: viper on September 01, 2014, 02:06:46 PM
forgive me if you have already done this , but when people are new to bleeding BIKE brakes they tend to do it wrong, its different to the car system where you pump, open nipple , let air out and pump and repeat.
you need to put your clear pipe on the nipple and leave the nipple open, then just keep pumping the lever and keep topping up the fluid resovoir, it make take 2 or 3 reservoir fulls of fluid , the air is a pig to get out , just keep pumping, topping up and eventually you will see it come through.
there are alternative methods , reverse bleeding, vacuum bleeding and also cable tie on the lever, leave over night and the air slowly rises up into the reservoir, but the first method has always worked fine for me.
let us know how you get on
What he said above.
I use this....
http://www.motionpro.com/motorcycle/partno/08-0143/
You've probably done this already but there is a bleeder at the master cylinder itself. Make sure you bleed that one as well. These systems can be a bear if they are totally dry, though. You may also want to try reverse bleeding where you push fluid up from the caliper.
http://www.ebay.com/itm/like/201157524478?lpid=82
If you've taken hoses loose then you may need to replace the washers, but it sounds like to me you need to start at the master cylinder and make sure all the air is out of that.
The cable tie on the brake lever overnight works remarkably well.
A TZ250 I once owned had front Lockheed brakes that were a right B*stard to bleed.
The solution I found was to remove the caliper from its mounting (leaving hoses connected & fluid installed) and suspend it at the highest level possible overnight, air bubbles slowly rose out of the caliper up the hoses and released through the reservoir :yes:
Could be worth a try
However ultimately if you're struggling, get it to a bike shop and let them sort it, shouldn't cost you more than 30-60 minutes labour.
Some might find it hard to get the bike to a bike shop with no brakes.... Me included.... :no:
So alternatively just follow the workshop manual... page 492 of the manual...
If you ain't already got one just download it.
Oops, yeah, I never thought that you wouldn't be able to ride it there as you'd have no brakes. :whistling:
Do what he said.....look at page 492 of the manual. :mfr_lol:
Still got rear brakes doesn't he?
Quote from: virginiajim on September 02, 2014, 09:00:41 PM
Still got rear brakes doesn't he?
For what good they are on their own. I wouldn't want to rely purely on the back brake. :wacko:
Well, I certainly wouldn't ride it at MotoGP or WSBK speeds, but it might be enough to get to the dealer if it wasn't that far away. :smiley:
lets hope this guy is not one of our usual 1 post wonders, hes not been back on here to check out all the great advice you guys are giving!
thanks to everyone who offered some comments/opinions. Have tried everything and more which has been mentioned. There was even a slight tear in one of the washers in the piston so even replayed them. Nothing works so I've done the unthinkable and booked it into my local dealer next week. With departure only 2 weeks away time is not on my side. I'll let everyone know what the issue is. I'm still of the opinion is ABS related however. Time will tell.
cheers for the comments
I'd be keenly interested in the outcome. Sounds like a real puzzler. I really don't see how the ABS has anything to do with it though, but I'm keeping an open mind. Assuming it had good pressure before the brake pad swap and fluid flush, it has to be something to do with an air bubble in the line or caliper and not ABS. I'm wondering if the master cylinder went dry at some point...early on in the flushing procedure?
:agree: sounds like its air in the line, which can be a pain to expel.
Can't see it being the abs chef, but same as Jim. Keeping an open mind. Sounds like the master cylinder needs sorting / bleeding first mate