Question about 1998 Volkswagen Beetle
We have replaced the master cylinder 3 times and bleed the lines over and over and we are still getting air problems. My husband still thinks its the cylinder because we don't appear to have any leaks and when you hold the pedal down after pumping, it stays firm, but once you let up you lose the pressure again.
The first 2 cylindars were rebuilds but the last one was knew from napa.
Sounds like u r ready to drop the beetle off a cliff. U seem to be doing everything that should give u a firm pedal. 1st- I've never done brakes on a 78 beetle, but have done many brake jobs on others, so in general here are some possibilities: A couple of things, did u bench bleed the master cylinder? (put in a vise, fill w/ brake fluid, using screwdriver, pump piston to remove air). Although u don't have to do this, it saves time trying to get the air out of the system. Did u bleed the brakes starting w/ the farthest from the master cylinder, 'til all air out, then to next farthest away, etc til u do closest brake cylinder last? Made sure the master cyl. never ran down while bleeding and sucked in air? Does your 78 have power brakes? If yes, beetle was running while u bled brakes? Bleeding procedure: Have helper pump pedal approx. half way to floor, 3 pumps, on 3rd pump, hold it half way down, while u open bleeder, when flow decreases from bleeder, close bleeder, then helper can let foot off of pedal and pump 3x again, repeat til fluid shows no air. You probably know all this, just hoping u are doing something minor wrong, and this could help. Individual wheel cylinders aren't leaking? Let me know if this helps at all, if not, I'll try to come up w/ something else. Stay away from the cliff.
Posted on Oct 24, 2008
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Fig. 1: Loosen the front brake line in order to bleed the master cylinder
Fig. 2: Connect a bleed hose from the bleed valve on the front caliper to a jar of brake fluid
Fig. 3: Always follow the lettered sequence when bleeding the hydraulic brake system
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