[T2] Disc brakes dragging
Erik Burtis ewdb92 at gmail.comSat Aug 15 14:27:58 PDT 2020
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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 > >> >> _______________________________________________ > >> >> type2 mailing list > >> >> type2 at type2.com > >> >> https://www.type2.com/lists/type2/listinfo > >> > > >> > > >> _______________________________________________ > >> type2 mailing list > >> type2 at type2.com > >> https://www.type2.com/lists/type2/listinfo > >> > > > _______________________________________________ > type2 mailing list > type2 at type2.com > https://www.type2.com/lists/type2/listinfo
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