[T2] Disc brakes dragging

Jamie jrivers at globalserve.net
Sun Aug 16 07:10:24 PDT 2020


Inside the booster, there is a valve, opens on brake application and allows vac to assist movement Of cylinder in master cylinder

If fluid is in that area, it will hold the port open,, and keep brakes applied while vacuum is available 

and when more fluid gets in there ,,A slight tap of the pedal will cause the vac to depress it and pull it out from under your foot, and apply brakes fairly hard! 

Sounds to me that there is fluid that has bypassed seal on master ,,, over the years,, so you don’t notice a recent drop in fluid in the reservoir,, 

Pull the master (loosen off far enough) and field fab a dip stick from box board to slide into booster below the master .. see if there is fluid in there
I don’t worry about a little fluid,, 

If there is a “lot” <relatively speaking,, I’ve devise a way to siphon/ wet vac out the fluid ... a u shaped steel line ,, 
There isn’t much room ,, 

Of course , if there has been a recent drop in reservoir level,, then a master cyl repair/ replacement is in order 

My take on it,,  Jamie 

> On Aug 16, 2020, at 9:51 AM, Erik Burtis <ewdb92 at gmail.com> wrote:
> 
> I was thinking about this problem early this morning.  Let's see: You said
> you replaced all the brake lines, so unless dirt got into the system at
> that time or there is a defect, they shouldn't be the issue..  The problem
> went away when you disconnected the brake booster.  I think this rules out
> blockage in the lines or brake fluid issues.  This sounds like a buildup of
> vacuum to me and when you stop driving and press the brakes, you release
> the vacuum.  It can happen if the check valve is in backwards; can also
> happen if the booster vent line is blocked (did it get pinched during your
> spindle work?).  Do both front brakes drag?  If so, also an indication this
> is not line related.  Maybe a failed booster would hold extra vacuum, but
> it seems to me that they do the opposite.  One of the tests for a failed
> booster is a change in rpms when you press the brake pedal.
> Erik
> 
> 
>> 
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