1999 Audi A4 Brakes sometimes soft & spongy

DOLE1947

MEMBER
1999 AUDI A4
6 CYL
4WD
AUTOMATIC
14,500 MILES

Sometimes when I apply the brakes they are soft, or spongy. Other times when driving very slow, like backing out of a parking spot, they sort of apply by themselves for a split second. What could the problem be?

Wednesday, January 14th, 2009 AT 1:51 PM

1 Reply

DAVE H

MECHANIC
13,384 POSTS

Mayhave air in system. Try bleeding the system.

BLEEDING PROCEDURE
WARNING:Use only DOT 4 brake fluid from a sealed container. DO NOT mix brake fluid with any other type.

CAUTION:Brake fluid will damage painted surfaces. If brake fluid is spilled on painted surface, wipe it off immediately and clean with alcohol.

Ensure brake master cylinder reservoir is full. Connect hose to brake caliper bleed screw and insert other end of hose in a clear container 1/4 full of clean brake fluid. Bleed brake calipers in sequence. See BRAKELINE BLEEDING SEQUENCE table.
BRAKELINE BLEEDING SEQUENCE
ApplicationSequence
All Models. RR, LR, RF & LF

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Thursday, January 15th, 2009 AT 9:50 PM