Mechanics

VOLKSWAGEN JETTA PISTON PROBLEM

1997 Volkswagen Jetta • 140,000 miles

I just replaced both rear calipers, bleed the lines, but can not get brake pedal to not go directly to floor.
After replacing the first caliper I was able to regain brake pressure. I have not replaced the emergency brake cables yet.
AD
Avatar
Guest
October 17, 2012.



Did the new calipers come with new brake pads?

When you installed the caliper/pads onto the rotor, how much "free play" was there between the pads and the rotor?

Thomas

Tiny
Exovcds
Oct 17, 2012.
If your caliper piston was retracted all the way when you installed it. Then there would have been over 1/4" of free play, that the
piston has to travel the "first time" you applied the brakes. What that does, is cause the ratchet in the piston to not work correctly
and that will cause "low pedal" issues.

What you need to to is turn the piston back in all the way and then turn it out manually until you have a little bit of free-play when
the caliper is sitting over the pads.2mm or so.

Then, pump the pedal and and re-bleed.

Thomas
AD

Tiny
Exovcds
Oct 17, 2012.

AD