[T2] Disc brakes dragging
david raistrick keen at icantclick.orgSun Aug 16 18:41:39 PDT 2020
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I'd start with a fresh bed-in and get them hot. that might sort out the balance. or scuff the pad surfaces and the rotors, then re-bed. On Sun, Aug 16, 2020 at 9:14 PM Chris Dreike <cdreike at gmail.com> wrote: > Thanks to you guys I installed 1/16" thick shims between the booster and > the M/C. Problem is gone! I'll try some thinner shims until the problem > returns and go with something thinner than 1/16. As it is now the pedal > goes WAAAY down to about 1.5" above the floor. I'll lengthen the pedal to > booster rod back to spec too. > > Now on to the next problem, the brakes pull to the left. I know that the > driver disc got pretty hot one time before I realized the brake drag > problem. The passenger side didn't get quite as hot. How can I remedy this? > Have the disc turned? New pads? > > Success, of sorts, at last. > > thanks again. > Chris > > > On Sun, Aug 16, 2020 at 1:33 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
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