1998 Chevy Cavalier brake pedal goes to floor

JEFF46222

MEMBER
1998 CHEVROLET CAVALIER

Brakes problem
1998 Chevy Cavalier 4 cyl Front Wheel Drive Automatic

I have a 98 chevy cavalier the pedal is high before you start the car. After starting the pedal goes to the floor shoes ok pads replaced, drums replaced.
bleed brakes no change.

I pulled the brake master cylinder with abs hydraulic unit.

I can not separate the master cylinder from abs unit.
so I can replace the master cylinder. The order takers at Autozone could not tell me how to separate the master cylinder from the abs unit. The MC I am buying requires a core. I tried prying and tapping. No luck.

My question is replacing the master cylinder fix the pedal going to floor?

How do I separate the abs unit from the master cylinder?

2 Replies

CHILLINANGEL21

MEMBER
5 POSTS

No that will not help. The question on separating the abs from the master cylinder is quite easy. There should be 2 star bolts on the bottom of the abs unit. Take them out, then there should be 2 star shaped bolts on the side of the cylinder take them out then replace the cylinder and repeat that backwards.

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Monday, June 27th, 2011 AT 7:45 PM

RASMATAZ

MECHANIC
75,992 POSTS

Try this before you replace the M/C

MANUAL BLEEDING

ABS Modulator Assembly (Priming)
Clean master cylinder reservoir cover and surrounding area. Remove reservoir cap. Ensure reservoir is full. Install reservoir cap. Attach a clear hose to rear bleeder valve and submerge other end of hose in a container of clean brake fluid. See Fig. 1. Slowly open rear bleeder valve. Depress brake pedal until fluid begins to flow. Close valve and release brake pedal. Repeat procedure until no air bubbles are seen in hose. Repeat procedure for front bleeder valve.

TCS Modulator Assembly (Priming)
Clean master cylinder reservoir cover and surrounding area. Remove reservoir cap. Ensure reservoir is full. Install reservoir cap. Remove TCS modulator assembly bolt to bracket to access bleeder valves. Attach a clear hose to right side bleeder valve and submerge other end of hose in a container of clean brake fluid. Slowly open right side bleeder valve. Depress brake pedal until fluid begins to flow. Close valve and release brake pedal. Repeat procedure until no air bubbles are seen in hose. Repeat procedure for left side bleeder valve.

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Monday, June 27th, 2011 AT 9:26 PM