[T2] Disc brakes dragging

[david raistrick]

i'd definitely try disconnecting the vacuum to see what changes.  something is weird....


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> On Aug 15, 2020, at 1:56 PM, 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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