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| problems with brakes and bleeding them https://www.ausmini.com/forums/viewtopic.php?f=2&t=91226 |
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| Author: | rapa59 [ Mon Dec 07, 2015 7:48 pm ] |
| Post subject: | problems with brakes and bleeding them |
Hi guys got drum brakes all round. rebuilt the front brakes so then I bled all of them. Ive been told and the manual says to unscrew nipple then push pedal down and hold then tighten nipple then let go of brake pedal. I keep doing this but still finding faint bubbles in lines. Try driving and theres no pedal pressure. If you pump it a few times the pedal comes good but then just goes soft again. Am I missing something or any tips? |
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| Author: | slacko [ Mon Dec 07, 2015 8:41 pm ] |
| Post subject: | Re: problems with brakes and bleeding them |
Did you put the retaining spring thingy magig that secures the brake shoe to the wheel cylinder back in I have heard that if you don't the wheel cylinder will retract back into the cylinder the brake adjuster holds the shoe out , not the cylinder piston if not attached just a thought |
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| Author: | Phil 850 [ Mon Dec 07, 2015 8:51 pm ] |
| Post subject: | Re: problems with brakes and bleeding them |
Buy an elcheapo one man bleed kit. Connect the hose to the bleed nipple, crack it open a fraction. Put the valve of the bleed kit into the bottom of a bottle on the floor. Have an assistant keep the brake master cylinder topped up. Start pumping the pedal in long full steady strokes. When the bubbles stop, close the bleed nipple. Move on to the next wheel. May have to do all 4 a couple of times. |
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| Author: | Minicooper4me [ Mon Dec 07, 2015 9:11 pm ] |
| Post subject: | Re: problems with brakes and bleeding them |
Sounds like you still have air in the system. I have done the following for years and always works. I take it you have an early mini, not the duel brake master cylinder type. Have all wheels on the deck, not jacked up. If jacked up, ensure all wheels are supported so the suspension is compressed slightly. This is to ensure the bias valve is not closed off. Top up the brake master cylinder. Ensure all brakes are adjusted properly and the handbrake is on. You must start from the furtherest bleeder. Connect a clear plastic hose to the LH rear brake bleeder, place end of hose in a clear bottle. Wear some clear plastic goggles, not glasses. Brake fluid in the eyes is not nice. Have someone pump the brake pedal several times, open the bleeder. Pedal goes down and hold down. Close bleeder. Repeat twice. If you get bugger all fluid out of the rear bleeders, just before you open the bleeder tell the pumper to slightly easy off a little bit of pressure on the pedal. The bias valve may be shut and by easing off slightly, it releases it open. Top up master cylinder. Go to RH rear, repeat as per LH rear side. Then LH front, then RH front. Top up master cylinder each time, don't let it get low. At this stage you should have a reasonable pedal. Wash down any spills around the hubs and floor with water. |
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| Author: | Minicooper4me [ Mon Dec 07, 2015 9:17 pm ] |
| Post subject: | Re: problems with brakes and bleeding them |
Yep, the elcheapo brake bleeder tool does a great job also. If you still can't get a decent brake pedal, maybe you'll need a repair kit in the master cylinder. If so, and if the bore is scored, get a new master cylinder. |
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| Author: | slacko [ Mon Dec 07, 2015 9:30 pm ] |
| Post subject: | Re: problems with brakes and bleeding them |
I have found that gravity feed works the best for me or you can vacuum bleed |
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| Author: | rapa59 [ Mon Dec 07, 2015 10:37 pm ] |
| Post subject: | Re: problems with brakes and bleeding them |
Thanks for all the info. Iv heard of gravity feed too. Guess il try everything and see what happens |
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| Author: | mad-mk1 [ Tue Dec 08, 2015 9:08 am ] |
| Post subject: | Re: problems with brakes and bleeding them |
i had a very similar, almost exact issue a few weeks ago. I have always blead brakes the conventional method and never had an issue. tombo on here said to bleed the rears, he opens the nipple and pumps like crazy, then closes the nipple with his foot pushed down. I don't know how or why, but this worked perfectly. I think its to do with the restrictor valve! I also had to re adjust all my brakes, which made a huuuge difference! |
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| Author: | rapa59 [ Tue Dec 08, 2015 9:55 am ] |
| Post subject: | Re: problems with brakes and bleeding them |
Sounds like there's so many ways to bleed them |
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| Author: | Morris 1100 [ Tue Dec 08, 2015 12:42 pm ] |
| Post subject: | Re: problems with brakes and bleeding them |
Back the adjusters off before bleeding. |
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| Author: | drjbeam [ Tue Dec 08, 2015 12:50 pm ] |
| Post subject: | Re: problems with brakes and bleeding them |
Check the front adjusters one could be worn out happen to me was fine when blead up and adjustment done the first bump on the road pedal went to the floor New front back plates ain't cheap at $100+ a side new |
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| Author: | DavidE [ Tue Dec 08, 2015 1:44 pm ] |
| Post subject: | Re: problems with brakes and bleeding them |
drjbeam wrote: Check the adjusters one could be worn out happen to me was fine when blead up and adjustment done the first bump on the road pedal went to the floor New back plates ain't cheap at $100+ a side new But there a some used secondhand ones available. |
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| Author: | winabbey [ Tue Dec 08, 2015 2:38 pm ] |
| Post subject: | Re: problems with brakes and bleeding them |
drjbeam wrote: New back plates ain't cheap at $100+ a side new If you mean just the drum brake back plate itself MKO has NOS for $25 a side. http://minikingdomonline.com.au/product ... e-lh-rear/ MKO recently added fully assembled drum brake assemblies for those who don't want to get their hands too dirty.  http://minikingdomonline.com.au/product ... embly-lhs/ |
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| Author: | drjbeam [ Tue Dec 08, 2015 4:09 pm ] |
| Post subject: | Re: problems with brakes and bleeding them |
winabbey wrote: drjbeam wrote: New back plates ain't cheap at $100+ a side new If you mean just the drum brake back plate itself MKO has NOS for $25 a side. http://minikingdomonline.com.au/product ... e-lh-rear/ MKO recently added fully assembled drum brake assemblies for those who don't want to get their hands too dirty. http://minikingdomonline.com.au/product ... embly-lhs/ I was talking about the front not rear |
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| Author: | Mick [ Tue Dec 08, 2015 4:11 pm ] |
| Post subject: | Re: problems with brakes and bleeding them |
winabbey wrote: Now I have a photo reference for when I forget which spring goes where
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