Hey Guys, I need some sanity here.
2005 v50 T5
Just bought it (from a friend, sight unseen, even worse) and driving home I noticed poor breaking.
Stomping on it, it pulled to the left.
No warning lamps, pedal feels normal.
Pads and rotors are fine.
With 20 psi on a motive bleeder, neither front caliper bleeds freely. The rear calipers bleed normally.
The front left will bleed a little by engaging the pedal. The Right front was dry, and pads loose.
I assumed either MC or ABS brain faulty.
I took to an indy, they concluded: "The abs pump/valve body has a blockage on the right front supply line" and recommended replacing abs unit, along with every other component of the brake system BTW, for 6500.00.
I said pass.
I pulled the abs and sent to Xemodex.
They said that both module and block were bad. Replaced block and serviced module.
I put it back on car tonight:
both rear calipers bleed freely, both front calipers do not.
Each front caliper will now burp if you work the pedal, but that is it.
My question is: what is normal?
I have not run the car or even put the battery back on yet.
Does the abs module regulate caliper flow and it needs to be running?
What is my move here?
Thank you
Dave

 

Update:

I basically looked at every thing today.

Free flow bleeding from upper hardline feed to the caliper bleed screws.
Free flow bleeding from MC to abs in both supply lines.
Flow out of abs to RF and LF hard line is minimal (20 psi equals slow ooze).

My sane self would trouble shoot the abs valves are not open?
But just replaced by Xemodex. So what am I missing?

 

Calipers will squirt small amounts with pedal activation via bleed screw.
But not bleed freely.
what does that signify?

 

I will complete the thread, issue solved by using a combination of power bleeder and pumping brake pedal.
My best guess was that there was air in the abs block that needed to be forced out.

 

+1, that was my experience replacing an abs valve body in the past. I had to use a power bleeder and actuate the brakes

 

To explain, the pressure created by the pump-up "power bleeder" is trivial, which is why it can bleed the brakes, but does not create enough pressure to OPERATE the brakes.

So, if you have any significant air in the system, that air will simply compress "in place", and the fluid will not move from master cylinder to slave cylinders and bleed out the bleed screws.

Pumping the pedal, that creates a LOT more pressure, enough to get things moving, even with significant air in there. One should expect to have to do this when replacing anything in the brake system. The pump-up power bleeders work great, but they only work when you have insignificant air in the system.