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Brake Bleeding?

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Old 06-23-2008, 05:13 PM   #1
boogerschnot
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Default Brake Bleeding?

Should I bleed the lines with the car running or not in a Power brake system..
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Old 06-23-2008, 05:38 PM   #2
rmodel65
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Default RE: Brake Bleeding?

i always do it with the car off, no reason to waste fuel
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Old 06-23-2008, 05:53 PM   #3
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Default RE: Brake Bleeding?

Also makes it easier to get 'real' pedal feel, that way you can tell the difference between spongy and firm, whereas the power booster would make that rather difficult.
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Old 06-23-2008, 06:18 PM   #4
UH60LCHIEF
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Default RE: Brake Bleeding?

I've never bled it with the engine running and I've never had a problem.
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Old 06-23-2008, 06:48 PM   #5
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Default RE: Brake Bleeding?

no question about that. engine off.
The booster is only there to make it a bit easier on your foot.
makes no difference in the bleeding process (how much air is going out at what rate).
And as Tad says with powerbrakes you never know if the thing is properly bled.

So aye .. leave engine off
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Old 06-24-2008, 10:13 AM   #6
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Default RE: Brake Bleeding?

Thanks guys.. I bleed the lines tonight.
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Old 06-24-2008, 10:56 AM   #7
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Default RE: Brake Bleeding?

when you don't have any speed-bleeders or bleeding container, then you'll need someone else to help you.
Do you know exactly how the bleeding process works (just to make sure)

Kalli
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Quick Performance Racing 9" rear, Moser axles, 3.5:1 trac-loc from FRPP and T5 transmission.
CSRP disc brakes front and FRPP discs back.
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Old 06-24-2008, 01:26 PM   #8
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Default RE: Brake Bleeding?

Yea, Ive done it a couple of times, I just didnt know if I should run the car or not. I figured not.. but had to be sure.

The wife is going to be my pedal pusher..
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Old 06-24-2008, 03:24 PM   #9
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Default RE: Brake Bleeding?

don't forget to ask her if "it's hard yet"[sm=roll.gif]
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Old 06-24-2008, 04:14 PM   #10
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Default RE: Brake Bleeding?

Quote:
ORIGINAL: jlg2002

don't forget to ask her if "it's hard yet"[sm=roll.gif]

LOL

Don't be short with her if she screws up somehow, if you do it won't matter how hard "it" is, you'll be on your own.
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Old 06-24-2008, 08:23 PM   #11
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Default RE: Brake Bleeding?

http://www.speedbleeder.com/

These work great. I usually also submerge some clear vinyl line in about 1" of fluid in a container hung next to the calipers so no bubbles can get back into the lines and you can see when you get nice clean fluid. I've tried using different brake fluid brands so the color changes when you get the new stuff all the way through the line. Beats trying to explain brake bleeding to my chick for sure
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Old 06-24-2008, 10:31 PM   #12
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Default RE: Brake Bleeding?

I bought a vacuum type unit to bleed the brakes. Personally I think it was a waste of money as it sucks air in around the bleeder so its
hard to tell when the line is actually blead. Those speed bleeders look to be a good idea. How does the unit actually lock seal? I can see
how the ball bearing can act to allow fluid out but how do they lock the ball in place to or how does it seal when the bleeder is tightened up?

Jav
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Old 06-25-2008, 03:37 AM   #13
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Default RE: Brake Bleeding?

Quote:
ORIGINAL: JapanGT

I bought a vacuum type unit to bleed the brakes. Personally I think it was a waste of money as it sucks air in around the bleeder so its
hard to tell when the line is actually blead. Those speed bleeders look to be a good idea. How does the unit actually lock seal? I can see
how the ball bearing can act to allow fluid out but how do they lock the ball in place to or how does it seal when the bleeder is tightened up?

Jav
+1 on the vacuum thing. you sit there and this thing sucks and sucks and you cannot tell if it's ok now or not.
Some people say you hear it (i don't believe in it). I have to bench bleed my master as I didn't do it right the first time and then off to the brakes again.

As to your question about the speed bleeders. Let me answer your question with a question ;-) How does a normal bleeder screw work. How does that prevent brakefluid coming out once its closed .,..

that's a normal one:
http://www.pegasusautoracing.com/Images/M/3266-1.JPG
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302ci, Edelbrock RPM heads, xe268h, 650 speed demon, Hooker Long Tube headers and Flowmaster 40s
Quick Performance Racing 9" rear, Moser axles, 3.5:1 trac-loc from FRPP and T5 transmission.
CSRP disc brakes front and FRPP discs back.
http://www.gascc.ie

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Old 06-25-2008, 04:43 AM   #14
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Default RE: Brake Bleeding?

engine needs to NOT be running ,and always start on the furthest bleeder from master cylinder.Dont expect to get it 'perfect " on the first try.Bleed it ..drive it ..bleed it again ....always go from futherst bleeder to closest.If master is new or all lines have been removed from it bench bleeding master might be a good idea.with these cars faster is better ..butONLY if you can STOP!!!!!

Ispeak from first hand knowledge on this....got pulled becauseI couldnt slow down enough quick enough...luckily trooper was a motor head and really just wanted to talk mustangs

hope this helps
jeff
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Old 06-25-2008, 08:42 AM   #15
UH60LCHIEF
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Default RE: Brake Bleeding?

If it's a new master you MUST bench bleed it. Usually the master cylinder states right on the box that failing to do so will void the warantee. My last one did anyway and I've always bled it on the bench first. Many newer master cylinders have a bleeder port right on them. You will doubtfully see that on a Classic unless you're doing some serious brake system re-design like going to a hydraulic rather than vacuum assist though. The "bleed it drive it bleed it again" advice is good. I usually bleed it two or three times until I get good pedal pressure before I take it out on the road. Oh and BTW those vacuum pumps are only good if you get the industrial type. Those hand held jobs are usually Chineese pewp.
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Old 06-25-2008, 10:01 AM   #16
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Default RE: Brake Bleeding?

It worked out well last night, I had the wife push the pedal and hold while I opened the bleeder and then closed over and over again. I kept forgeting to tell her when I was done though,, so she would still be pushing the pedal and I would be out and walking around the car.. LOL... "so your not under the car,, does that mean I can let go of the pedal now??" Ohh,, sorry, I got distracted...

The brakes work great.. I think I will re-bleed them though in a couple of days.. Just in case..
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67 Fastback A Code: 64k Miles, all original project for the wife.

http://www.cardomain.com/ride/2665602
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Old 06-25-2008, 10:01 AM
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