GeorgeB Posted May 8, 2016 Share Posted May 8, 2016 On first push my brake pedal moves let's say 2 inches before becoming firm, if I press again directly afterwards, let's say it moves 1 inch, and by the third press it's firm right away, at least, it's how you would expect it to be. Subsequently it will stay that way until about a minute of no braking where I'm back where I started. I bled the brakes, the pedal was exactly the same afterwards. Had a look round this forum and found that I'd done them in the wrong order, and used the wrong pedal pump method (I'd opened the bleed nipple and pumped the brake pedal). So I bled them again, NSR - OSF - OSR - NSF, pump the pedal 4-5 times, open the bleed nipple, allow the pedal to go to the floor and hold down, close the nipple, lift the pedal, repeat. Inner, then outer nipple. At no point did the header tank go below minimum. OSR and NSF kept giving very fine bubbles, even having repeated the above steps on each caliper 15 times or more. Pedal is exactly the same as when I started. Any ideas or suggestions on what to try next? Or the cause of the fine bubbles. I'm not losing brake fluid. Thanks Quote Link to comment Share on other sites More sharing options...
Richf Posted May 8, 2016 Share Posted May 8, 2016 Are you just cracking the nipple open as little as possible? Sometimes air can be drawn in via the nipples threads Quote Link to comment Share on other sites More sharing options...
GeorgeB Posted May 8, 2016 Author Share Posted May 8, 2016 Yep, 1/4 of a turn max. Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted May 8, 2016 Share Posted May 8, 2016 Why did you bleed the the brakes in the first place ? Did you replace some hydraulic components or did the pedal just get softer over time. If you are still getting bubbles out, then there is still air in the system. Is it a Brembo set up or after market BBK ? Quote Link to comment Share on other sites More sharing options...
GeorgeB Posted May 8, 2016 Author Share Posted May 8, 2016 They're 370 akebono's. Bought the car towards the start of this year. Not sure if they where like this when I got it to be honest. Did a track day. At some point after that I started to notice it. But they could have been like that from day one. Assumed that I had cooked the fluid on the track day, but having bled them twice I'm not really sure now. Would you suggest keep bleeding them? I mean how many times should I do the pedal pump steps before I'm just wasting time and fluid? Cheers Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted May 8, 2016 Share Posted May 8, 2016 So you got Akebonos on a 350 ? You keep bleeding until all the air bubbles stop. Usually, If it is just a fluid change then, you keep bleeding until the new fluid comes through. May be a plan to get some one who under stands the bleeding process to give you a hand. 1 Quote Link to comment Share on other sites More sharing options...
GeorgeB Posted May 8, 2016 Author Share Posted May 8, 2016 Yeah that's right, 370 akebono's on a 350. I get that you keep going till there is no bubbles. But having done that for quite a while I started wondering if there was something else wrong that I'd not considered. If I'm not mistaken the brakes are paired up diagonally, since it was one pair that seems to continually give the bubbles I wondered if that was significant? Quote Link to comment Share on other sites More sharing options...
davey_83 Posted May 8, 2016 Share Posted May 8, 2016 Keep the master cylinder well topped up before each caliper bleeding. The clear hose attached to the bleed nipple, keep this point upwards so the pipe is higher than the nipple so any air will gather there rather near the nipple. Ideally is a two person task. 1 Quote Link to comment Share on other sites More sharing options...
Richf Posted May 8, 2016 Share Posted May 8, 2016 I have to say it a you wont be the first and definitely not the last but the nipples are at the top of the caliper arent they ? Quote Link to comment Share on other sites More sharing options...
GeorgeB Posted May 8, 2016 Author Share Posted May 8, 2016 Yep, two nipples on the top of the calipers Rich Quote Link to comment Share on other sites More sharing options...
GeorgeB Posted June 26, 2016 Author Share Posted June 26, 2016 Hi Guys, Still struggling with this one, I've done another bleed my self with an experienced friend. Then when that didn't resolve it I took it to the local garage, made sure they seemed comfortable with the two nipples per caliper. I do think the pedal has changed from my initial description, but still it's not right. On first push the pedal moves let's say 2 inches before becoming firm (once it's there it feels right), if I press again directly afterwards it's firm right away. Subsequent presses will feel firm until it's not been touched for 30 seconds or so. I guess the main thing I'd like to understand is could there be anything else causing this problem apart from incorrect bleeding of the system? e.g. Does the fact that I have a BBK mean that the master cylinder needs upgrading to match? (I'm not sure if this has been done or not) Could a problem with the master cylinder (or anything else) cause this behavior? Thanks Quote Link to comment Share on other sites More sharing options...
Apoc124 Posted August 3, 2016 Share Posted August 3, 2016 having this exact problem with my brakes now, except a garage did a full fluid change and the bleeding for me (didnt have the time or space to do it myself), did you ever get this resolved? they claim that there is no air in the lines atall but from what im reading there must be air somewhere for this to be happening? Any help would be appreciated also! Quote Link to comment Share on other sites More sharing options...
GeorgeB Posted August 7, 2016 Author Share Posted August 7, 2016 I've also had a local garage bleed my brakes so I'm sure there's no air in the lines! What calipers have you got? I spoke to Jez @ Horsham Dev who said it sounds like knock off, where the rotor isn't running quite true, and pushes the pads back. And in fact I don't experience the problem while the car's stationery, which seems to support the idea. Not had chance to investigate further yet. Quote Link to comment Share on other sites More sharing options...
BulletMagnet Posted August 7, 2016 Share Posted August 7, 2016 Still original brake hoses? Perhaps they are starting to perish and need replacing Quote Link to comment Share on other sites More sharing options...
GeorgeB Posted August 7, 2016 Author Share Posted August 7, 2016 Braided hoses, less than 8000 miles to the best of my knowledge. Quote Link to comment Share on other sites More sharing options...
Apoc124 Posted August 7, 2016 Share Posted August 7, 2016 (edited) I've got the standard brembo setup and as far as i know i still have the original hoses aswell, getting another garage to take a look as i'm not confident that my first place did it properly, might have done the order wrong or something so hopefully tomorrow will tell. i read that if it isn't air it could be the master cylinder but that's absolute worst case scenario... cant really find anything else it could be other than air or the cylinder -- Update: got mine done again this morning and they have sorted it, make sure that whoever does the bleeding knows to do both sides on the brembo calipers as the place i first took mine didn't and resulted in loads of air still in the system, time to go back and try to get my money back i guess! Edited August 8, 2016 by Apoc124 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.