[T2] Disc brakes dragging

Erik Burtis ewdb92 at gmail.com
Sat Aug 15 14:27:58 PDT 2020


After that test, the only thing I can think of (besides the booster) is the
vacuum check valve.  Is it in correctly and working?

There are a fair number of places that rebuild boosters..  New ones are
also available, but they don't bolt straight on early bays.

https://www.thesamba.com/vw/forum/viewtopic.php?t=463331
https://www.thesamba.com/vw/forum/viewtopic.php?t=693126

Erik
71 Westy

On Sat, Aug 15, 2020 at 5:02 PM Chris Dreike <cdreike at gmail.com> wrote:

> I disconnected the vacuum from the manifold and guess what? The brakes take
> a lot of push to make them work.
> I drove around for about 15 minutes and the brakes did not pump up or drag.
> I suppose there is something wrong with my year and half old booster. Not a
> particularly repairable item.
> Any other opinions?  Thanks Guys. Especially Steve B.
>
> Chris
>
> On Sat, Aug 15, 2020 at 10:56 AM Chris Dreike <cdreike at gmail.com> wrote:
>
> >
> > Alright, I just shortened the pedal to booster rod a full turn on the
> > adjustment. There is clearly a gap. I performed my pedal pressing dance
> and
> > took a drive for about 10 minutes. The pedal slowly came higher as I
> drove
> > around until the brakes were dragging again. Stopped shut off the engine
> > and pressed the pedal 10 times and it incrementally went down to about
> half
> > way from the 5th to the 10th pump. Am I looking at a defective brake
> > booster?  Or is their a check valve in the master cylinder that may be
> > sticky?
> >
> > Thanks,
> > Chris
> >
> > On Sat, Aug 15, 2020 at 9:59 AM Joseph Delecki <jdelecki at msn.com> wrote:
> >
> >> Chris, I have a 71 camper with front disk brakes. When I press down on
> >> the brake pedal before starting the engine, there is an inch to 1.5
> inch of
> >> freeplay from the get go. This business of having to pump the brake
> >> pedal ten times and achieving 4-5 inches of freeplay  suggests you have
> a
> >> problem with the braking  system  in standby even before you start the
> >> engine.
> >>
> >> I assume your brakes were  operating properly before doing the overhaul?
> >> If so , assuming your replacement parts are appropriate, there was
> >> nothing obvious  to me that what you did could cause your problem. I
> know
> >> you bled your brakes, but to me it sounds like you still have air in the
> >> braking system somewhere. I would check with Bently for the suggested
> brake
> >> bleeding protocol and see if there is anything you missed.
> >>
> >> Joe
> >>
> >>
> >> ------------------------------
> >> *From:* type2 <type2-bounces at type2.com> on behalf of Chris Dreike <
> >> cdreike at gmail.com>
> >> *Sent:* Saturday, August 15, 2020 11:27 AM
> >> *To:* Jason Foster <jkfoster101 at gmail.com>; VW type 2 late aircooled <
> >> type2 at type2.com>
> >> *Subject:* Re: [T2] Disc brakes dragging
> >>
> >> I already checked and increased the gap. I think the spec is .02" or
> .04".
> >> I can easily make the gap larger.
> >> Will try that today.
> >>
> >> Thanks,
> >> Chris
> >>
> >> On Sat, Aug 15, 2020 at 8:13 AM Jason Foster <jkfoster101 at gmail.com>
> >> wrote:
> >>
> >> > Sounds like there is not enough freeplay between the brake booster and
> >> the
> >> > master cylinder.   There is an adjustment bolt on the booster.  If
> there
> >> > isn't freeplay the brakes slowly build pressure while driving.
> >> >
> >> > Happy to answer any questions
> >> >
> >> > Jason
> >> >
> >> >
> >> >
> >> > On Fri, Aug 14, 2020, 10:00 PM Chris Dreike <cdreike at gmail.com>
> wrote:
> >> >
> >> >> Hi Guys,
> >> >> I put this up once before but I still have a problem. This is on my
> 71
> >> Bay
> >> >> with power disc brakes. The booster, master cylinder, brake hoses,
> >> brake
> >> >> cylinders, calipers are all new. I installed empi drop spindles a
> >> couple
> >> >> months ago. Ever since the disc brakes are slowly closing up and
> >> dragging.
> >> >> Before I start the engine, with the parking brake off, I pump the
> >> brakes
> >> >> 10
> >> >> times. By the 10th pump the the pedal goes down about 1/3-1/2 way and
> >> >> feels
> >> >> good. It goes down smoothly. The bus will roll forward or back on the
> >> >> slightest slope, so the brakes are free.
> >> >>
> >> >>  I start the engine and drive off. After a bit of driving and using
> the
> >> >> brakes, the pedal goes hard very near the top of stroke and the discs
> >> are
> >> >> dragging slightly. I can stop, shut off the engine and pump 10 times
> >> and
> >> >> the brakes free up once again.
> >> >>
> >> >> I bled the brakes myself when I installed everything and today I took
> >> it
> >> >> to
> >> >> my trusted mechanic who also bled the brakes and made sure the rear
> >> brakes
> >> >> are properly adjusted. I still have the same problem.
> >> >>
> >> >> Any ideas on what may be going on? I have the original proportion
> valve
> >> >> installed. What is the deal with a valve in the master cylinder? Is
> >> there
> >> >> one in the 71? Should I remove it? Could the booster have a leak? I
> >> >> adjusted the pedal to booster rod so there is a small gap between it
> >> and
> >> >> the booster.
> >> >>
> >> >> Thanks,
> >> >> Chris
> >> >> 64 DD Kamper Kit
> >> >> 71 sunroof
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> >> >
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