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Post by veg on Sept 6, 2018 16:18:34 GMT 1
Ok gurus
I have 2 brand new calipers and master cylinders with new Venhill lines, the calipers are a grimeca ap Lockheed copy and a gb moto ap racing copy both are underslung both front and back. I cannot get them to build pressure I have filled both reservoirs open the bleed nipples pump fluid through cap the bleed and repeat no good fluid is going through no probs but cannot get any pressure. I have now bought a one way valve same process nowt. All lines etc are air and fluid tight.
Both bleed nipples though appear to be leaking slightly when I am bleeding the brakes.
I have bleed and replaced numerous systems before with no problems this is starting to annoy me ever so slightly
Any ideas
Tia
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Post by lolly on Sept 6, 2018 16:47:07 GMT 1
have you tried the syringe method ,filling from the bottom ?
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Post by veg on Sept 6, 2018 17:20:02 GMT 1
Did think of that doddy tbh it is really starting to twist my melon
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Post by panzermatt on Sept 6, 2018 17:47:03 GMT 1
i had this very problem last weekend, nothing i tried worked, until doohan on here told me what to do. 10 mins later i had rock hard brakes.
so, i presume you have fluid at the calipers, if so, take the lid of'master cylinder, then and this is the trick. feather the brake lever in and out about 5-6 mm at a time or quarter of an inch in old money.
keep doing this, it might take about 5 mins, then you should start to see the bubbles coming up into the master cylinder, be patient, and keep doing it. when i started nothing happened, then ta dahhh loads of bubbles. after a while they stop, then bleed brakes as normal.
let me know how you get on.
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Post by dusty350 on Sept 6, 2018 17:47:50 GMT 1
I think the rear will need to be removed from the hanger and suspended above the height of the master cylinder to bleed properly, with something between the pads obviously. A pain but the only way to do it I believe. Yamark bled my fronts for me on the white hybrid. With fluid in the system and the cap off the reservoir, he feathered the brake lever really quickly for 5 to 10 seconds at a time. Took about 40 mins but seeing all the little bubbles rising into the master cylinder showed it was working. I'm sure he will give a more accurate description if you ask him  Dusty  |
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Post by dusty350 on Sept 6, 2018 17:50:16 GMT 1
Panzermat beat me to it ! Dusty |
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Post by veg on Sept 6, 2018 18:02:46 GMT 1
Interesting about the rear calliper having to be above the master cylinder, if that is because the calliper is under slung then unfortunately so is my front calliper due to the Mechanical anti dive. This bloody bike it really doesn't want to live does it its fighting me at every opportunity. Next time it is going to be a normal bloody hybrid built one of those and it was a piece of piss in comparison
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Post by stusco on Sept 6, 2018 18:08:50 GMT 1
Interesting about the rear calliper having to be above the master cylinder, if that is because the calliper is under slung then unfortunately so is my front calliper due to the Mechanical anti dive. This bloody bike it really doesn't want to live does it its fighting me at every opportunity. Next time it is going to be a normal bloody hybrid built one of those and it was a piece of piss in comparison It’s character building |
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Post by veg on Sept 6, 2018 18:14:20 GMT 1
😀
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Post by steven on Sept 6, 2018 18:56:45 GMT 1
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Post by veg on Sept 6, 2018 19:09:42 GMT 1
Thanks steven that will do it 👍
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Post by sbscnor on Sept 6, 2018 20:49:05 GMT 1
I had a underslung Brembo rear calliper and tried all sorts of things over two days, finally un-bolted it and raised it above M\Cy and took 5 minutes to bleed perfect.
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Post by veg on Sept 6, 2018 21:56:59 GMT 1
This would obviously have to happen post me lock wiring the calipers in place
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Post by petehodges on Sept 6, 2018 22:15:33 GMT 1
ive got ap on mine there absoulte coots too bleed the fronts are still not right ,like you mate i lost my fooking shit with it , hope you find a fix veg
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Post by veg on Sept 22, 2018 17:59:35 GMT 1
Bought a one way valve didn’t work then an eazi bleed really loads of pants then tried a syringe and pulled it through, still not perfect but they are braking
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Post by botty on Sept 22, 2018 18:06:17 GMT 1
When you get some sort of lever. Cable tie the lever back to the bars overnight. Try in the morning, works well. If not satisfied tie again.
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Post by mikee on Sept 22, 2018 21:29:20 GMT 1
Prime the calipers first , but more importantly pull the pistins out a wee bit first , when they’re assembled , and after everyone’s played with them the pistons can be right back in the caliper body , pull them out a bit , inject some fluid , then it’s usually only a matter of minutes to get a functioning brake
Mike
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Post by aid22 on Sept 30, 2018 12:02:52 GMT 1
Bought a one way valve didn’t work then an eazi bleed really loads of pants then tried a syringe and pulled it through, still not perfect but they are braking The syringe method works every time for me. I have been doing it that way for years on bikes and cars/vans. Even use it on clutches and abs units. |
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Post by madmick on Oct 1, 2018 15:44:35 GMT 1
I let gravity do most of the work first. Fill master cylinder, turn bleed nipples out 1/5 from fully closed. Attach a pipe to nipples into a jar and wait.
Keep checking now and again, to fill up master cylinder if needed. Normally overnight does it.
M.M.
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Post by steve63 on Oct 2, 2018 16:49:08 GMT 1
I must have spent a couple of hours trying to just get fluid into the calipers on my RGV after a complete refurb. Then I bought a brake bleeder that uses air from a compressor to pull the fluid down and through the bleed nipple. Looks a bit like a spray gun. Five minutes later, both front calipers and rear caliper done. cost me about £20.00.
Never will I do it the hard/slow way again.
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