UR brake bleeding procedure
03-02-2005, 08:18 PM
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UR brake bleeding procedure
<center><img src="http://pictureposter.audiworld.com/54386/2-05a.jpg"></center><p>Hi,
I have just finished installing a new master cylinder, and am looking for a system bleeding procedure that works well, since I am only able to get mostly air at the calipers, and at the bleeder on the MC itself. I must be missing something (yes there's fluid in the reservoir!). How have you all gone about this? Thanks in advance!
I have just finished installing a new master cylinder, and am looking for a system bleeding procedure that works well, since I am only able to get mostly air at the calipers, and at the bleeder on the MC itself. I must be missing something (yes there's fluid in the reservoir!). How have you all gone about this? Thanks in advance!
03-02-2005, 08:26 PM
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Are you using a pressure bleeder?
I've not changed a master cylinder, but when I flush fluid I use a pressure bleeder. It pushes fluid into the reservoir at 10-15 PSI while you open each of the bleed screws, furthest away from the reservoir to closest. Works great?
Rich
Rich
03-02-2005, 08:55 PM
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Re: Are you using a pressure bleeder?
No, just a vac bleeder at the bleed screws. Using a pressure bleeder, do you have to also bleed the MC and the rear pressure regulator?
03-03-2005, 06:10 AM
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Re: UR brake bleeding procedure
You can also "backbleed" them, which is the highly successful process of pushing the fluid back thru the system TO the master cylinder. Makes alot of sense, you are pushing fluid from the lowest point in the system to the highest point.
03-03-2005, 07:30 PM
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Re: UR brake bleeding procedure
Thanks for the replies!
I found that I had indeed missed an important step. I had not primed the MC, thinking that fluid would gravity feed thru the reservoir. once I filled the MC with fluid, I just bled the front brakes and the rear pressure reducer, and it was all good!
I found that I had indeed missed an important step. I had not primed the MC, thinking that fluid would gravity feed thru the reservoir. once I filled the MC with fluid, I just bled the front brakes and the rear pressure reducer, and it was all good!
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03-03-2005, 11:38 PM
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Re: back-bleeding
There is a pressure hand-pump that you should be able to get at www.eastwood.com or you can use a weed-sprayer type rig but connect the hose to the bleeder instead of the resovoir.
Keep a keen eye on your master cylinder level since you will be filling it via the brake circuit.
Keep a keen eye on your master cylinder level since you will be filling it via the brake circuit.
03-04-2005, 06:13 AM
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Re: UR brake bleeding procedure
If most owners had just topped off the fluid, via the normal fill spot, then bled every 5 years or so, "backbleed" would then push the oldest grottiest fluid back through the system? (not stuff I want in my M/C. Also working against gravity, I don't see the "sense"?
03-05-2005, 03:40 PM
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Re: I'm really not sure. I've just done calipers and clutch.
the correct procedure is detailed in the god of urq's website over in uk.
http://www.isham-research.co.uk/quattro/brake_bleeding.html
and do not back bleed.
Hope this helps!
www.quattroforum.com
http://www.isham-research.co.uk/quattro/brake_bleeding.html
and do not back bleed.
Hope this helps!
www.quattroforum.com