the_van_can Posted April 17, 2011 Report Posted April 17, 2011 hi all, this is a pretty basic one, just upgraded the diff in my ke70 and was wondering how the best way to bleed the brakes would be, the brake lines hooked up at the back on the diff but no fluid in them, so should I pump the pedal a tonne of times and try to get fluid into the line on the diff or should I just do the usual routine of pump pedal, loosen , pump pedal, will that eventually get fluid to the back. Also going to change the brake master while I'm bleeding brakes, A mate that doesn't really know ke70's said that there will probably be like 4 or 5 places (other than at wheels) in the brake system that I will have to bleed, sounds a little strange to me? thanks in advance. Quote
Evan G Posted April 17, 2011 Report Posted April 17, 2011 ive bleed my rear brakes by myself, crack the nipple and pump the pedal 10 times. jump out and tighten nipple and check fluid. do the same for the other side. Quote
19914afc Posted April 17, 2011 Report Posted April 17, 2011 or make a brake bleeder, just get something like an old brake fluid bottle (probably need 2 500ml bottles if your replacing the master cylinder and punch a hole in the lid of one and put some rubber/plastic/whatever flexable line you have/can get through the top and pu it over the bleeder nipple and then pump the brakes. Or even just something like this http://www.supercheapauto.com.au/online-store/products/Vizibleed-One-Man-Brake-Clutch-Bleeding-Aid.aspx?pid=9500#Description Quote
LittleRedSpirit Posted April 17, 2011 Report Posted April 17, 2011 If youre doing it alone, just barely crack the nipple and slowly pump down and really slowly come up, as in take a good 10 seconds to lift the pedal. if you do this right, the gravity will be able to stop you sucking air back in through the nipple when you lift, which is what happens when there is nobody there to tighten the nipple before you lift. Do it slow enough and the suction wont overpower the weight of the fluid dripping through the lines. Then tighten the nipple, and test the pedal. Repeat until you are happy with the feel. If you've done major work you can bleed the brakes at each corner, plus also at the Master cylinder by cracking the lines where they attach. Quote
ke70dave Posted April 17, 2011 Report Posted April 17, 2011 you can buy self brake bleeding kits, which is basically a piece of hose with a 1 way valve inline. then you just put one end on your bleed nipple, the other end in a coke bottle with a bit of fluid in the bottom. howeever, i would get someone to help. you need to be able to see the bubbles coming out the caliper, no good just doing it untill "pedal feels good", might be full of bubbles still.. i am sure that people have had success with doing it by themselves, i just don't trust it... Quote
LittleRedSpirit Posted April 17, 2011 Report Posted April 17, 2011 Well that technique was tasught to me by a mechanic that I rate highly. Also, if you have a lot of time to spare, you can leave them slightly cracked and just let the fluid run through the lines before you finish the bleed, it will take care of a lot of the air. Just make sure you have only just cracked the line or you will lose all your fluid too fast. The worst thing you can do is jump on and start smashing the pedal up and down. I wouldn't be doing anything rough on the pedal until the system has some pressure, as you can damage your MC badly, especially if its old. Some people just don't get it at all. I had a guy from the next shed over at work do the pedal bit for me. Gave me the shits in a big way, as once I asked him to help me bleed by doing the pedal while I crack the lines, he just jumped straight in the car and before I said anything, he smashed the brake pedal about 5 times, pumped almost all the fluid straight out of the system and sprayed it all over the cars underbody, before I even had my spanner in my hand. I'm like stop stop stop and he's pumping away going "man your pedal is shit" I'm like just f@$king stop you moron. This was a guy who claimed to be mechanically minded and volunteered to help as he knew all about it allegedly. I was ready to f@$king kill him. So I had to top up the fluid, and start over and thankfully my MC was new enough to take the flogging he gave it. Quote
styler Posted April 18, 2011 Report Posted April 18, 2011 (edited) Haha LittleRedSpirit I feel your pain there! The 2 person traditional method with one person nipple crack/tighten and the other person doing pedal push/release works when 2 people know what they are doing and do it perfectly every motion, as well as having the end submerged in the bottle at all times, else they have to restart it all over again. Honestly the best and suprisingly easiest way I have found is to use a one man brake bleeder kit with 2 people... The good one with line, plastic tab lock and black one way end, it's a lot better than the bottle style one. Check you are using the correct DOT brake fluid for your system Start at the corner furtherest from the master first and work your way in closer, ie Rear left, Rear right, Front left, Front right. Put ring end on nipple, Then one man bleeder kit onto nipple with plastic lock tab, Black end into bottle, doesn't have to be submerged as it has a one way valve, Get moderate pressure on pedal, Crack nipple slowly until fluid flows at a reasonable rate and hold the spanner in that position, Pump pedal slowly and drain the master cylinder of old fluid but do not run dry Top up master with fresh fluid regulary so it doesnt run dry (Guy in car to check) Pump fresh fluid through until solid fresh fluid appears with no air sections Make sure master does not run dry, Top up if close Nip up bleed nipple, Remove kit, Repeat for all brake corners. Honestly bleeding brakes is simple so if unsure, I recommend getting it done at a workshop Edited April 18, 2011 by styler Quote
the_van_can Posted April 19, 2011 Author Report Posted April 19, 2011 Haha LittleRedSpirit I feel your pain there! The 2 person traditional method with one person nipple crack/tighten and the other person doing pedal push/release works when 2 people know what they are doing and do it perfectly every motion, as well as having the end submerged in the bottle at all times, else they have to restart it all over again. Honestly the best and suprisingly easiest way I have found is to use a one man brake bleeder kit with 2 people... The good one with line, plastic tab lock and black one way end, it's a lot better than the bottle style one. Check you are using the correct DOT brake fluid for your system Start at the corner furtherest from the master first and work your way in closer, ie Rear left, Rear right, Front left, Front right. Put ring end on nipple, Then one man bleeder kit onto nipple with plastic lock tab, Black end into bottle, doesn't have to be submerged as it has a one way valve, Get moderate pressure on pedal, Crack nipple slowly until fluid flows at a reasonable rate and hold the spanner in that position, Pump pedal slowly and drain the master cylinder of old fluid but do not run dry Top up master with fresh fluid regulary so it doesnt run dry (Guy in car to check) Pump fresh fluid through until solid fresh fluid appears with no air sections Make sure master does not run dry, Top up if close Nip up bleed nipple, Remove kit, Repeat for all brake corners. Honestly bleeding brakes is simple so if unsure, I recommend getting it done at a workshop haha thanks guys, nah wont need to get a workshop to do it, just wanted to know best way to approach it seeing I have no fluid in the back and fluid in the front, and me understanding how it actaully flows haha. cheers guys Quote
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