[T2] Disc brakes dragging

Chris Dreike cdreike at gmail.com
Sat Aug 15 14:07:13 PDT 2020


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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