[T2] Disc brakes dragging
jdelecki at msn.com
Sat Aug 15 09:59:51 PDT 2020
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.
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.
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
> 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
>> times. By the 10th pump the the pedal goes down about 1/3-1/2 way and
>> 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
>> 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.
>> 64 DD Kamper Kit
>> 71 sunroof
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