ymz
Top Post Dawg
- Joined
- May 12, 2003
- Location
- Between Toronto & Montreal
- TDI
- 2003 Jetta TDI Wagon, 2003 Jetta TDI Wagon
Is there a quick-and-dirty way to tell which has gone bad?
Yuri
Yuri
+1Is the pedal hard to press if so It could be the booster or it could be a vacuum leak between the vacuum pump and the booster. Check the plastic hose there known to split. Plenty of posts on it with pictures.
Any work done recently?Anyone ever figure out what their problem was? Having the exact same issues with my wife's 2001. I've ruled out the vacuum pump itself, also the hose to the booster. Next step is trying to find a mityvac and test the booster itself. The brakes work like S***. But once you hold the pedal down for a few seconds they lock right on. Also on very rare occasion the pedal will go right to the floor with no brakes at all, as described above
Unfortunately I've already done that, and with two different vacuum pumps and no changeHold off on throwing money at it. My daily driver was doing the same thing. It would scare the crap out of you and then it work again. There is a fitting on the back of the vacuum pump that gets loose and causes a vacuum leak if the hose is moved. The nipple actually had come loose on mine and all it took was a little RTV once we got it cleaned up so it would stick. The fix has worked for over 9 months now. I almost pulled the trigger on a master cylinder and booster. Basically .50 cents worth of glue fixed it.
replacing the booster in my golf solved the sinking pedal issue, this was after running many quarts of brake fluid through the system with a pressure bleeder and replacing the master... booster was applying more vacuum per pedal input than needed, hence the sinking pedal... i confirmed this by watching brake pressure in vcds ... as the pedal sank to the floor the pressure INCREASED instead of remaining steady or decreasing....this indicated the hydraulics were fine and the booster was at fault.... keep in mind not all abs modules give you the option of monitoring brake pressure, mine has ESP so i could ... sinking pedal due to a bad booster is not just a vw problem but other manufactures have the same issueSo what about it going to the floor as you described?
do you happen to have the assembly part number ?Just want to mention this one. Vw has a new set (booster and master) that has replaced all previous revisions. The bolt pattern between master and booster has changed which is why it comes as a full set with the tank. I paid $260 for everything. This isn’t much more than autoparts store remans. And sadly I had a year of problems related to a defective out the box “new” auto parts booster. All has been great since I went to the oem vw one.
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