Reply to "Spongy brakes, is it a vacuum issue?"

panteradougMember

quote:
Originally posted by Kid:
Still, why would it fail just now you've been working on the calipers only?

Just wondering...

Often a master cylinder that goes through this procedure of pumping the brakes in the process of rebuilding the brakes, fails during the procedure or shortly after.

I have seen this many times on many cars.

Using a vacuum pump to suck the air out of the system is less traumatic to the master itself BUT you still need to bleed the master first for it to work.

The vacuum pump will not bleed the trapped air out of the master.

Maybe you can just think of it this way, the master was just hanging on the edge and the stress of pumping the brakes, especially if there was air in the master and it was pumping dry as a result, just pushed it over the edge.

Incidentally, I have had new masters fail right after installation BECAUSE they weren't bleed first.

6/7/155:04 AM

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