brake lines problem

[Huw Powell]

> > Ok...So I changed the pads on my 86 4000q.    The back went well and the
> > front was ok except I lost a lot of brake fluid (had trouble speading the
> > caliper so I opened the brake line to relieve the pressure). ...   Now I
> > don't have any pressure in my braking system.   Pedal is pushed to floor
> > with little resistance.    I figure that I still have air in my lines but I
> > don't know the correct procedure for removing it.    Can some one tell me
> > what to do?    Thanks in advance.
> 
> Just pumping the pedal with the line open isn't going to purge the line
> of air.  On the downstroke you'd push fluid out, but on the upstroke
> you'd suck air back in.
> 
> What you need to do is a full brake bleeding procedure. ...  Do all four wheels until
> you get a firm pedal with all screws closed, and make sure that the pedal
> will not sink to the floor over time when pressed.

just one quick addendum, you also need to bleed the proportioning valve
(below the master cylinder) on a 4kq.  I believe the Bentley and Phil
Payne approved procedure is to start with the prop valve, then go to the
right rear, left rear, right front, left front (working in towrds
master) and then repeat the prop. valve.  While you're at it, plan on
starting with nice fresh quart or liter of brake fluid and pump those
lines til clean fluid comes out.  Repeat every two years...

-- 
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/