[V8] brake bleeding

[qshipq at aol.com]

 I don't use ATE Super Blue, it eats the seals in the brake and clutch master/slave.  Pentosin Super DOT 4 or equivalent - valvoline sells a good one at your local FLAPS.  Forget the vacuum bleeder, use only a pressure bleeder, no more than 15psi.  Sounds like you might want to disconnect the right front line and try bleeding it.  My guess is you have a collapsed rubber line.  That said, the light 'on' means you have a problem.  It comes on for 3 reasons, bad ebrake switch, low on brake fluid (or bad brake resevoir sensor) and/or low pressure in the system.  The switch for the brake pressure is on the servo, and can be pulled to test it.

For brake bleeding, there is a ck valve located above the rear axle.  If you raise the right or left rear, the ck valve will fight brake fluid going to that rear caliper.  If doing this procedure, it's best to have both rears up at the same height.  Also the proportioning valve at the back of the car (right side control arm) tends to stick, which can be freed up with PB or WD40.  Lastly, you may have brake component paint in the lines, which can cause a major problem during a bleed.  The only way to release that is to remove the lines at the ABS, and blow air back thru the lines from the calipers.

HTH and my .02

Scott J
92 v8

 


 

 

-----Original Message-----
From: Ingo Rautenberg <ingo.rautenberg at gmail.com>
To: Seamus O'Carey <cheshirecatsbox at gmail.com>
Cc: v8 <V8 at audifans.com>
Sent: Tue, May 10, 2011 7:57 pm
Subject: Re: [V8] brake bleeding


I'm no fan of vacuum bleeders. I would go with a pressure bleeder (8-10 psi)

through the brake reservoir. Start at the right rear, left rear, right front

and left front. Make sure you have enough clear tubing to go at least a foot

or two above the bleed nipple to make sure you don't see any more bubbles. I

like to switch between an ATE blue and ATE clear, so I know I'm using fresh

fluid.



Anyhow, that's my recommendation. Otherwise, you could have a bad master

cylinder, maybe?



Ingo



On Tue, May 10, 2011 at 7:43 PM, Seamus O'Carey

<cheshirecatsbox at gmail.com>wrote:



> I'm still at a loss on this bleeding thing. I've read the brake section of

> the manual about 5 times, but since I still seem to be doing something

> wrong, I must have missed something.

>

> What is the proper method of bleeding the brakes? Do I have to do something

> with the ABS system or should I be able to just pull the air through with a

> vacuum bleeder at the calipers? Car running or not?

>

> If you want more info, here's the background story:

> I got the car with brake problems and even though I drove it home (~90

> miles), the brakes have always been squishy and the light has always been

> on.

>

> The previous owner replaced the bomb, but it didn't help. I replaced the

> servo (as well as the rear calipers and all 4 pads and rotors) and then

> bled

> the calipers, but the pedal was still a bit soft and the light was still

> on.

> Also at this point the right front brake started dragging.

>

> So I replaced the master cylinder the other day, which resulted in NO

> brakes

> at all. I did forget to bench bleed the master cylinder however, so I

> connected a pressure bleeder to the fluid reservoir and then disconnected

> the line going into the ABS pump, from the forward-most line on the master

> cylinder, and connected a vacuum bleeder to it, to pull some of the air

> out.

> There was quite a bit of air, so I was hopeful, however it didn't change

> the

> pedal feel at all.

>

> So I went ahead and pulled the right rear wheel and hooked the vacuum

> bleeder to that caliper and (with the pressure bleeder still connected to

> the fluid reservoir) started pumping. After 15 minutes of getting only

> small

> droplets of fluid I started suspecting that I was again doing something

> wrong, which is when I came in to write this e-mail.

>

> I'm especially frustrated, because I have a manual here, but every time I

> do

> something it actually only makes things worse. At some point it has to get

> better, right?

>

> Seamus

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