[T2] Disc brakes dragging
Chris Dreike cdreike at gmail.comMon Aug 17 20:29:39 PDT 2020
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I now have 1/64 thick shims in place and the brakes are working fine. I don't think I want to go any thinner. I also found Samba links that talk about adjusting the booster to M/C rod to avoid this problem. https://www.thesamba.com/vw/forum/viewtopic.php?t=705144 https://www.thesamba.com/vw/forum/viewtopic.php?t=693460 And scroll down about half way on this one to see a diagram that is true for both non booster and booster systems. Booster systems the rod from the booster to the M/C needs a 1mm (.04") gap too. https://www.thesamba.com/vw/forum/viewtopic.php?t=679475 And this one has a nice cut away drawing of the booster. Item 4 pushes into the M/C and needs to be adjusted for a 1mm gap. Cheers, Chris On Mon, Aug 17, 2020 at 8:40 AM Bob <accessys at smart.net> wrote: > > > FWIW I have had bad parts right out of the box so I wouldn't "trust" that > a new part, any part, is working until inspected and tested > > Bob > > > On Sun, 16 Aug 2020, Erik Burtis wrote: > > > "Thanks for all the input. All the parts are new save the steel brake > > lines"- these coil be rusting from the inside out and causing a blockage, > > but since the symptoms go away with the booster disconnecting, I don't > > think this is your issue. > > > > " Erik, Where is the check valve you mentioned earlier? Is it in the > M/C? or > > were you referring to the vacuum check valve in line to the manifold?" > > Yes, it's the one by the manifold. As Bob suggested, make sure it's > > installed in the right direction. Memory is a little fuzzy but I think > the > > bentley has it backwards. Search the samba for the bentley mistakes > > thread. The check valve should hold a vacuum for several minutes after > you > > turn the car off, overnight in some cases. So if you go back 5 min after > > turning the bus off, press the brakes and the pedal should go down easi=y > > for the first cycle or two. Then it'll become more difficult. > > > > " AND one more thing. In perusing the forums on the Samba I found a post > > complaining of exactly the problem I'm having" Shoot the PO a message > and > > see if/how he solved it. > > > > There are some problems that show up with the new boosters verse rebuilt. > > Call your vendor, maybe they have some suggestions? > > > > > > On Sun, Aug 16, 2020 at 4:29 PM Chris Dreike <cdreike at gmail.com> wrote: > > > >> Wow, Thanks for all the input. All the parts are new save the steel > brake > >> lines. The brakes worked fine before I installed the drop spindles. > >> I looked up How works a brake booster. The brake fluid level is not > >> dropping. There appears to be a weep hole at the bottom of the M/C > mounting > >> flange. No fluid dripping out. > >> Yes the brakes are working fine with the vacuum line disconnected from > the > >> intake manifold. The vacuum check valve is new and working as I checked > the > >> function. > >> The vent line is in good working order. Sadly the boot at the front of > the > >> booster is shot after an year and a half. Anyone know where to get a new > >> one? I'll try Wolfsburg West tomorrow. > >> > >> Later today I will add a small shim between the M/C and the booster and > see > >> if that helps. The booster seems to be the problem. Will report back > later. > >> > >> Erik, Where is the check valve you mentioned earlier? Is it in the M/C? > or > >> were you referring to the vacuum check valve in line to the manifold? > >> > >> AND one more thing. In perusing the forums on the Samba I found a post > >> complaining of exactly the problem I'm having. New booster from > Wolfburg ( > >> I got mine from CIP1 and it looks to be the same manufacturer) and his > disc > >> brakes were dragging. I did not see a solution on that thread however > there > >> were a lot of posts saying to have your old OEM booster rebuilt rather > than > >> buy a new one as the new ones are problematic. > >> > >> Cheers, > >> Chris > >> > >> On Sun, Aug 16, 2020 at 7:10 AM Jamie <jrivers at globalserve.net> wrote: > >> > >>> Inside the booster, there is a valve, opens on brake application and > >>> allows vac to assist movement Of cylinder in master cylinder > >>> > >>> If fluid is in that area, it will hold the port open,, and keep brakes > >>> applied while vacuum is available > >>> > >>> and when more fluid gets in there ,,A slight tap of the pedal will > cause > >>> the vac to depress it and pull it out from under your foot, and apply > >>> brakes fairly hard! > >>> > >>> Sounds to me that there is fluid that has bypassed seal on master ,,, > >> over > >>> the years,, so you donât notice a recent drop in fluid in the > reservoir,, > >>> > >>> Pull the master (loosen off far enough) and field fab a dip stick from > >> box > >>> board to slide into booster below the master .. see if there is fluid > in > >>> there > >>> I donât worry about a little fluid,, > >>> > >>> If there is a âlotâ <relatively speaking,, Iâve devise a way to siphon/ > >>> wet vac out the fluid ... a u shaped steel line ,, > >>> There isnât much room ,, > >>> > >>> Of course , if there has been a recent drop in reservoir level,, then a > >>> master cyl repair/ replacement is in order > >>> > >>> My take on it,, Jamie > >>> > >>>> On Aug 16, 2020, at 9:51 AM, Erik Burtis <ewdb92 at gmail.com> wrote: > >>>> > >>>> I was thinking about this problem early this morning. Let's see: You > >>> said > >>>> you replaced all the brake lines, so unless dirt got into the system > at > >>>> that time or there is a defect, they shouldn't be the issue.. The > >>> problem > >>>> went away when you disconnected the brake booster. I think this rules > >>> out > >>>> blockage in the lines or brake fluid issues. This sounds like a > >> buildup > >>> of > >>>> vacuum to me and when you stop driving and press the brakes, you > >> release > >>>> the vacuum. It can happen if the check valve is in backwards; can > also > >>>> happen if the booster vent line is blocked (did it get pinched during > >>> your > >>>> spindle work?). Do both front brakes drag? If so, also an indication > >>> this > >>>> is not line related. Maybe a failed booster would hold extra vacuum, > >> but > >>>> it seems to me that they do the opposite. One of the tests for a > >> failed > >>>> booster is a change in rpms when you press the brake pedal. > >>>> Erik > >>>> > >>>> > >>>>> > >>>> _______________________________________________ > >>>> 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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