[T2] Disc brakes dragging

Chris Dreike cdreike at gmail.com
Sat Aug 15 08:27:43 PDT 2020

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.


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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