Author Topic: Front Won't Build Pressure  (Read 5526 times)

Offline okrider

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Re: Front Won't Build Pressure
« Reply #15 on: March 17, 2020, 05:48:48 am »
I would expect it to be the exact opposite. That the fluid won't have anywhere to go if the lever is not pulled as the opening to the reservoir is closed.
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Offline Freddy

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Re: Front Won't Build Pressure
« Reply #16 on: March 17, 2020, 08:04:44 am »
You need to study hydraulic brake circuits 101.
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Offline okrider

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Re: Front Won't Build Pressure
« Reply #17 on: March 17, 2020, 08:07:56 am »
I'll go sign up for that in my local community college
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Offline VirginiaJim

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Re: Front Won't Build Pressure
« Reply #18 on: March 17, 2020, 11:09:09 am »
I put everything back together and then just opened the bleeder on the caliper and let it flow from it.  You don't have to leave the caliper on the bike for this to work.  It shouldn't take that long for fluid to come out of the bleeder.
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Offline okrider

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Re: Front Won't Build Pressure
« Reply #19 on: March 17, 2020, 11:38:02 am »
I'll try this tonight if nothing else works. Going to try reverse bleeding again today, ziptieing the hose so it doesn't come out and make a mess.
'11 Black: Russel Day-Long, Mountain Runner, cage w/ highway pegs, 2Bros Slip-on, Helibars Horizon

Offline okrider

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Re: Front Won't Build Pressure
« Reply #20 on: March 17, 2020, 03:24:19 pm »
Just did reverse bleed and went for a quick test ride. No difference. Very little front brake. Tried getting ABS to kick in, couldn't even do that.

I think I'm going to take a break, and get back to this tomorrow or next day and take the calipers apart again and re-do the whole thing, but I won't replace the seals this time. Just take apart and inspect
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Offline gPink

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Re: Front Won't Build Pressure
« Reply #21 on: March 17, 2020, 03:55:27 pm »
The brakes are linked? What happens when you activate the rear only?
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Offline okrider

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Re: Front Won't Build Pressure
« Reply #22 on: March 17, 2020, 06:22:04 pm »
yes, they're linked. The rear seems to work fine, like before.
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Offline gPink

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Re: Front Won't Build Pressure
« Reply #23 on: March 17, 2020, 06:28:08 pm »
yes, they're linked. The rear seems to work fine, like before.
Does engaging the rear activate the front?
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Offline Freddy

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Re: Front Won't Build Pressure
« Reply #24 on: March 17, 2020, 06:38:24 pm »
                     Going to try reverse bleeding again today, ziptieing the hose so it doesn't come out and make a mess.

If you're reverse bleeding the circuit why do you need to do this?   Secondly, what are you using to reverse bleed it with?  Thirdly, exactly what procedure, step by step, are you following?
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Offline okrider

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Re: Front Won't Build Pressure
« Reply #25 on: March 18, 2020, 07:28:18 am »
If you're reverse bleeding the circuit why do you need to do this?   Secondly, what are you using to reverse bleed it with?  Thirdly, exactly what procedure, step by step, are you following?

I got a big syringe I'm using to reverse bleed, the hose I attach on the syringe slips off and makes a mess, hence the ziptie.
  • switched to OEM bleeder first and bled real quick to make sure there's no air at the tip
  • Attached hose to the syringe, ziptied.
  • remove the reservoir cap
  • suck fluid into the syringe from the reservoir(I've been bleeding it for days, it's fresh fluid)
  • attach hose to the bleeder nipple, make sure no air bubbles are waiting to get pushed into the caliper
  • loosen the bleeder a half turn
  • push fluid in with the syringe, observe the reservoir level rises
  • tighten the bleeder
  • remove syringe
  • switch back to speedbleeder
  • bleed normally to get air out
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Offline Freddy

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Re: Front Won't Build Pressure
« Reply #26 on: March 18, 2020, 05:52:31 pm »
 :thumbs:  That should do it.  Any improvement?
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Offline okrider

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Re: Front Won't Build Pressure
« Reply #27 on: March 20, 2020, 05:07:01 pm »
No, it's still the same as before. I haven't had a chance to touch the bike since the test ride. I did notice the next day that the lever was empty for 2 pulls. no resistance whatsoever. Then I went back to check the day after and it had the same amount of brakes as before where it's nowhere near enough, but you can't super easily touch the lever to the bar. Going to try to spend more time on it this weekend
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Offline zrx mitch

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Re: Front Won't Build Pressure
« Reply #28 on: March 20, 2020, 06:19:51 pm »
I would be inspecting the caliper piston fluid and dust seals for proper installation.
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Offline Y0ssarian

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Re: Front Won't Build Pressure
« Reply #29 on: March 21, 2020, 03:08:03 am »
If the bike has linked brakes don't you need to bleed the system at both ends using both the front lever and the brake pedal?
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